Worm clamp

 

(57) Abstract:

The invention relates to mechanical engineering, in particular to a device for connecting pipes and hoses, and can be used in the installation of hydraulic and pneumatic systems. Worm clamp includes a housing made of pressed workpiece, the screw and the metal strip, coiled. The housing has a cylindrical section, which has a threaded stem of the screw, and a support area, which contains the ends of the metal strip. At the end of the metal strip cut groove and vyshtampovanny its arched sidewall through which this end is fixed on the punch-emphasis in the reference section of the housing. At the end of the metal strip is made corrugated toothed track, which is in engagement with the turns of the thread of the threaded rod. The calculation step of the threads of the threaded rod at 1.03-1.08 times the estimated step of teeth of the toothed track. The angle of inclination of the profile of the chamfer in the normal section of threaded rod and profile of teeth of the toothed track equal to 10o3oworking hand while tightening the metal strip in the housing and the 35o5ofor a working party with the release of metal strip from which the azone diameter hose clamp by increasing the active line engagement and prevent the interference of the teeth of the gear track and the threads of the threaded rod with a small diameter hose clamp, as well as improving the manufacturability of the design. 6 C.p. f-crystals, 13 ill.

The invention relates to mechanical engineering, in particular to a device for connecting pipes and hoses, and can be used in the installation of hydraulic and pneumatic systems.

Known worm clamps containing the metal strip in the form of a ring with a transverse through slots, one end of which is a through groove and a casing in which is located a worm screw interacting with the ridges of the tape (see , for example, USSR author's certificate 1638426, IPC 5 F 16 L 33/08, publ. 1991 U.S. patent 4099304, IPC 2 F 16 L 33/08, publ. 1978). Such worm clamps are of high technology and proven in hydraulic and pneumatic systems low pressure. Their common disadvantage of low reliability, because the elements of the wave gearing contact with the turns of the worm screw tangent to the rectangular plane.

Patent of the Russian Federation 2075002, IPC 6 F 16 L 33/06, publ. 1997. protected worm clamp, comprising a housing with worm screw and the metal strip in the form of a ring with elements of helical gearing, one end of the fixed housing, and other Conakry, each has two wavy-profile surface, and the cross-sectional area is determined by a formula that takes into account the diameter of the worm screw. In comparison with the above, this worm clamp, due to the increase in the area of interaction of the elements of screw engagement with the turns of the worm screw, can provide a higher tightening torque, less critical to precision worm clamp.

The disadvantage of the worm clamp, patent-protected 2075002, relatively low technology and low reliability, because the slightest lateral displacement of the worm screw relative to the original contour of the elements of the mesh belt is broken the reliability engagement due to the interference of the elements of the gearing, and to ensure accurate Assembly extremely difficult. In addition, the implementation of elements of helical gearing metal strip wavy profile form is impossible without special equipment for manufacturing matrix and punch stamp.

Patent of the Russian Federation 2117207, IPC 6 F 16 L 33/08, publ. 1998. protected worm clamp containing the metal strip in the form of a ring, one end of which is formed a threaded profile, and on cnym screw, consisting of direct screw cooperating with a threaded profile tape bearing belts of smaller diameter communicating with the shell and head turnkey, in order to increase reliability, simplify the design, Assembly, and repair of the clip, the body is made in the form of a continuous around the circumference of the tube in the casing opposite its base, covering the belt and the slot sizes, providing a placement directly screw and receiving the supporting corbels of the body, interacting with the supporting corbels of the worm screw, and the top case has a radius equal to the radius of the supporting corbels of the screw, in addition, from the base to the casing bevels, and the tape is made punch-stops in contact with end surfaces of the case base.

The disadvantage of this worm clamp is a relatively low technology, as the technology of the manufacture of the body includes milling and turning operations, and to the thickness of the tape and the tubular workpiece are increased requirements.

Closest to the claimed worm clamp, that is the prototype, is a worm clamp, protected by a patent of the Russian Federation 2119116, IPC F 16 L 33/08, PM a cylindrical rod or worm form resistant thread and tape, coiled with supports for fixing the housing and corrugated toothed track with thrust profile of teeth. The cylindrical section of the housing comprises a threaded rod more than half its circumference. The edges of the casing are bent, placed in the groove made on the stem of the screw at the side of the head, and grasping groove on its inner diameter below the axis of the screw. The reference section of the hull is asymmetric flat in cross-section and curved in the longitudinal directions of the surface.

The disadvantage of the prototype is a low technology, because the technology of construction of the body of the seamless tubular blanks includes operations, is not suitable for mass production of turned and milled, and the low reliability of the worm clamp with small diameters clamp hose (less than 30 mm) due to the interference of the teeth of the track, the turns of the threaded rod.

The problem solved by the invention is to increase reliability of the worm clamp in a wide range of clamp hose by increasing the active line engagement and prevent the interference of the teeth of the toothed track metal strip and turns the threaded rod of the screw, as well as increasing erwachen the clamp, comprising a housing having a cylindrical section, which has a threaded stud screw with thrust profile of the chamfer in the normal section and the reference section, is planar in cross-section and convex in the longitudinal direction, in which are placed the ends of the rolled-up ring of a flexible metal strip, one of which is fixed in the housing, and the other made corrugated toothed track with thrust profile of teeth, which engages with the screw rod screw, the calculation step of the threads of the threaded rod of the screw...at 1.03 1.08 times larger than the estimated step of teeth corrugated toothed track metal strip at the height of the teeth (the depth of the depressions of coils) is equal to 0,4...0,5 calculation step of teeth, and the angle of inclination of the profile of the threads of the threaded rod in normal cross-section and profile of the teeth of the toothed track metal strip is equal to 10o3oworking hand while tightening the metal strip into the housing and 355 degrees. working parties at the conclusion of the metal tape from the housing. The body is made of stamped blanks with a lock on the side of the support section, the length of which is equal to (3,0. . 4,0)S2where S2- calculation step of teeth of the toothed track metal L=(3,5...4,5)S1where S1- calculation step threads of the threaded rod of the screw. The cylindrical section of the housing cover stud screw more than half of the circumference, the head of the screw has a shoulder, the diameter of which exceeds the outer diameter of the cylindrical section of the housing, the neck of the screw between the head and the threaded shank of the bolt has a groove, the inner diameter of which is smaller than the diameter of the depressions turns and more than half of the diameter of the peaks of the threads of the threaded stem of the screw and the edges of the casing side of the screw head bent, placed in the groove on the neck of the screw, covering its internal diameter below the axis of the screw. Curved part of the support section of the case is made on the arc of a circle with radius equal to (0,8...1,2)Dminwhere Dminthe minimum diameter of the range of the diameters of the hose clamp. Site fixing end of the metal strip in the body contains the punch-emphasis in the reference section of the housing and the groove with arched sides in a metal strip, the height of the punch-stop equal to the thickness of the metal strip, the length of the groove is greater than the length of the reference part of the building not more than a step of teeth of the toothed track metal strip, the groove width exceeds the width of the punch-in is their radius of curvature smaller than the radius of the surface of the support area 5...10%. The metal tape has a flared on the outside of the ring with a width equal to 0.5. .1,0 the thickness of the tape, and a deflection angle of 20...30o.

The claimed technical solution meets the criteria of "novelty" and "inventive step", because there is no source of information, which would describe the claimed combination of features or a set of distinctive features.

The invention is illustrated by drawings.

In Fig. 1 shows a General view of the clamp Assembly, side view; Fig.2 is a view from the side of the screw head of Fig.3 is a cross section along a-a of Fig.4 shows a piece of the hull of Fig.5 - housing in the Assembly of Fig.6 is a cross section along B-B of Fig. 7 shows a scan of a metal tape; Fig.8 - cross section In Fig.9 is a section along G-G of Fig.10 - section along d-D in Fig 11 - look no E section In Fig.12 shows the design of the screw; Fig.13 shows a diagram of the gearing.

In Fig.1-13 are marked by numbers

1 - body;

2 - the screw;

3 - metal tape;

4 - cylindrical section of the housing;

5 - threaded section of the screw;

6 - reference section of the hull;

7 - the end of the metal strip fixed in the casing;

8 - the end of a metal tape with a toothed track;

13 - preparation of the body;

14 castle;

15 - the head of the screw;

16 - flange head screw;

17 - the neck of the screw;

18 is a groove on the neck of the screw;

19 - clamps screw;

20 - groove lock;

21 - the end of the reference section;

22 - flanging metal tape;

23 is a groove in the flange;

24 - line gear.

Worm clamp (Fig.1-3) includes a housing 1, a screw 2 and a coiled metal strip 3. The housing 1 has a cylindrical section 4, which has a threaded shank 5 of the screw 2 with the thrust profile of the chamfer in the normal section and the reference section 6 - flat in cross-section and curved in longitudinal section, in which are placed the ends 7 and 8 of the metal strip 3. Case 1 (Fig.4-6) is made from a cutting of the workpiece 13, the bent appropriately, with lock 14 on the sidewall of the support section 6, the curved portion of which is made of a circle with radius equal to (0,8...1,0)Dminwhere Dmin- the minimum diameter of the hose clamp. At the end of 7 metal tape 3 (Fig. 7-11) cut the groove 9 and vyshtampovanny its arched sides, through which the end 7 is fixed in the housing 1 on the punch-prop 11 reference section 6 (Fig.6).

For the fixation contritely tape 3, the length of the groove 9 is greater than the length of the supporting section 6 is not more than the estimated step of teeth corrugated toothed track 12, is made at the end of 8 metal strip 3 and are in engagement with the turns of the thread of the threaded rod 5 of the screw 2. The width of the groove 9 is larger than the width of the punch-stop 11, and the arched sidewalls 10 are extruded to a thickness of the support section 6 of the housing 1 segments with an inner radius less than the radius of curvature of the surface of the reference area 6 on 5...10%. The internal diameter of the cylindrical section 4 corresponds to (equal to) the diameter of the peaks of the threads of the threaded rod 5, the step of coils which...at 1.03 1.08 times larger than the estimated step of teeth corrugated toothed track 12. The screw 2 has a head 15 and a flange 16, a diameter greater than the outer diameter of the cylindrical section 4 of the housing 1. Between the head 15 and the screw rod 5 of the screw 2 (Fig.12) in his neck 17 is made groove 18, the inner diameter of which is smaller than the diameter of the troughs of the threads of the threaded rod 5, but more than half of the diameter of the tops of the coils. Edge of the end face of the cylindrical section 4 of the housing 1 from the side of the head 15 of the screw 2 are the tabs 19 which are bent and placed in the groove 18 of the neck 17 of the screw 2, covering the neck 17 below the axis V threaded rod 5 of the screw 2 and the corrugated teeth of the toothed tracks 12 are thrust profile in the normal section with angles of 10o3oworking hand while tightening the metal strip 3 in the housing 1 and the 35o5oworking side when the output metal strip 3 from the housing 1 (Fig. 8). The height of the corrugated teeth of the toothed track 12 and the depth of the troughs of the threads of the threaded rod 5 is equal to (0,4...0,5)S2where S2- calculation step of teeth corrugated toothed track 12.

The diameter and length of the threaded rod 5 is selected from the conditions: D=(2,5... 3,5)S1and L= (3,5...4,5)S1where D is the diameter of the peaks of the threads of the threaded rod 5; S1- calculation step threads of the threaded rod 5; L is the length of the threaded rod.

The cylindrical section 4 of the housing 1 comprises a threaded rod 5 of the screw 2 more than half of its circumference to the diameter of the peaks of the threads. The length of the support section 6 of the housing 1 is equal to (3...4)S2where S2- calculation step of teeth corrugated toothed track 12. To prevent damage pinched hose when tightening the metal strip 3 has a frame 22 (Fig.9) the width of 0,5...1,0 thickness of the tape, tinutul to the outside of the ring at an angle of 20...30o.

To improve the reliability of fixation of the screw 2 in the housing 1 in the flange 16 of the head 15 may be made GT (Fig.1) works as follows.

Worm clamp, a cylindrical section 4 which is installed and fixed 19 screw 2 and in the reference section 6 on the punch-stop 11 of the groove 9 is fixed to the end of the 7 metal strip 3 is pinched hose. The free end 8 of the metal strip 3 with corrugated toothed track 12 encircling grip the hose and having an end 8 to the control section 6 of the housing 1, placing it between the screw rod 5 of the screw 2 and the end 7. The rotation of the head 15 of the screw 2 in the direction of tightening the metal strip 3, the teeth of the corrugated toothed track 12 engages with the turns of the thread of the threaded rod 5, thereby pulling the metal strip 3 into the inside of the housing 1, while the circumference of the ring formed by the metal strip 3, is reduced and the compression pinched hose.

In comparison with the prototype declared worm clamp is adaptability, as its body and the metal strip are made by stamping, and the design is less critical for precision parts manufacturing and Assembly. Terms of engagement do not change when the transverse displacement of the threaded rod 5 relative to the original contour of the toothed track 12, as it sub rod 5 are compensated by the elastic deformation of the arched side walls 10.

The reliability of the worm clamp in a wide range of diameters we clamp the hose is increased due to the fact that the calculation step of the threads of the threaded rod 5 in comparison with the calculated pitch of the teeth of the toothed track 12 increased...at 1.03 1.08 times. It is possible to increase the active line gear 24 (Fig.13) to eliminate the possibility of interference of teeth with small (less than 50 mm) diameter hold down clamps, which is also due to the choice of the angle of inclination of the profile of the chamfer in the normal plane of the threaded rod 5 and the profile of the teeth of the toothed track 12 in the range of 10o3oworking hand while tightening the metal strip 3 in the housing 1 and the 35o5ofor the working side when the output metal strip 3 from the housing 1.

Studies declare worm clamp confirmed its reliability in diameters hold down clamps from 90 to 12 mm. At a step threads of the threaded rod 5 to the step of teeth of the toothed track 12 less 1,03 you receive the interference of teeth and coils with diameters less than 30 mm, With a ratio of more than 1.08 interference appears when the diameters of the hose clamp over 90 mm

The dimensions of the threaded rod 5 of the screw 2 and t is ing, the rigidity of the fixation screw 2 and reducing the weight and size characteristics. When the length of the support section 6 less than 3 steps of teeth is not ensured reliability gearing, at length more than 4 steps unnecessarily increase the size and weight of the housing. When the diameter of the threaded rod 5 is less than 2.5 steps chamfer low strength of the screw, when the diameter exceeds 3.5 steps unnecessarily increase the size of the screw.

1. Worm clamp, comprising a housing having a cylindrical section, which has a threaded stud screw with thrust profile of the chamfer in the normal section and the reference section, is planar in cross-section and convex in the longitudinal direction, in which are placed the ends of the rolled-up ring of a flexible metal strip, one of which is fixed in the housing, and the other made corrugated toothed track with thrust profile of teeth, which engages with the screw rod screw, characterized in that that calculation step threads of the threaded rod of the screw at 1.03-1.08 times the estimated step of teeth corrugated toothed track when the height of the teeth (the depth of the depressions of coils) is equal to 0.4-0.5 step of teeth, and the angle of inclination of the profile in the normal section threads threaded ayvani metal strip in the housing and the 35o5oworking parties at the conclusion of the metal tape from the case.

2. Worm clamp on p. 1, wherein the body is made of stamped blanks with a lock on the side of the support section, the length of which is equal to (3,04,0)S2where S2- calculation step of teeth of the toothed track metal tape.

3. Worm clamp on p. 2, characterized in that the diameter of the peaks of the threads of the threaded rod of the screw and its length are selected from the conditions D= (2,53,5)S1L=(3,54,5)S1where D is the diameter of the peaks of the threads of the threaded rod, L is the length of the threaded rod, S1- calculation step threads of the threaded rod.

4. Worm clamp on one of the PP.1-3, characterized in that the cylindrical section of the housing comprises a threaded rod screw more than half of its circumference, the head of the screw has a shoulder, the diameter of which exceeds the outer diameter of the cylindrical section of the housing, the neck of the screw between the head and the threaded shank of the bolt has a groove, the inner diameter of which is smaller than the diameter of the troughs of the threads of the threaded rod of the screw and more than half of the diameter of the peaks of the threads of the threaded stem of the screw and the edge of the casing with storonu diameter below the axis of the screw.

5. Worm clamp on p. 2 or 3, characterized in that the curved part of the support section of the case is made on the arc of a circle with radius equal to (0,81,0)Dminwhere Dminthe minimum diameter of the band hose clamp.

6. Worm clamp on one of the PP.1-5, characterized in that the site of fixation of the end of the metal strip in the body contains the punch-emphasis in the reference section of the housing and the groove with arched sides in a metal strip, the height of the punch-focus with technological uncertainty equal to the thickness of the metal strip, the length of the groove is greater than the length of the reference part of the building not more than a step of teeth of the toothed track metal strip, the groove width exceeds the width of the punch-stops, and arched sidewalls of the groove are extruded to a thickness of the support area of the body segments with an inner radius less than the radius of curvature of the surface of the reference area by 5-10%.

7. Worm clamp on one of the PP.1-6, characterized in that the metal strip has a flared on the outside of the ring with a width equal to 0.5 and 1.0 times the ribbon thickness, and angle of 20-30o.

 

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