Rotary tensioning mechanism

Abstract

The utility model relates to the technical field of clamping and polishing, and provides a rotary tensioning mechanism which is used for solving the problems that an existing tensioning mechanism is large in working space and not beneficial to compact annular distribution arrangement and comprises an installation base, an outer barrel, a pull rod, a clamp head, a gear motor and an air cylinder. The outer cylinder penetrates through the vertical plate and is fixedly arranged in a hollow rotating shaft of the gear motor in a penetrating mode, the clamp head is detachably fixed to the front end of the outer cylinder, the pull rod movably penetrates through the outer cylinder and the clamp head, and a shell of the air cylinder is fixedly arranged in front of the vertical plate. A piston rod of the air cylinder penetrates through the vertical plate and is horizontally and fixedly connected with a driving rod, a fixed plate is horizontally and fixedly arranged at the position, located above the gear motor, of the back face of the vertical plate, and a movable plate is vertically arranged between the fixed plate and the driving rod; the upper end of the movable plate is hinged to the rear end of the fixed plate, the lower end of the movable plate is hinged to the rear end of the driving rod, and the pull rod is arranged in the middle of the movable plate.

Description

Technical Field

[0001] This utility model relates to the field of clamping and grinding technology, and in particular to a rotary tensioning mechanism. Background Technology

[0002] Some castings require surface polishing after forming to improve their aesthetics, such as faucet housings. After sand casting, the outer surface of the faucet housing needs to be polished to achieve a bright and smooth finish. The faucet housing is clamped and fixed by a tensioning mechanism during polishing. Existing technologies such as... Figure 1 As shown. The tensioning mechanism mainly includes an outer cylinder 1, a pull rod 2, a clamping head 3, a geared motor 4, and a cylinder 5. The geared motor is fixed on the frame, and the outer cylinder is fixedly connected to the hollow rotating shaft of the geared motor and rotates with it. The clamping head is fixed to the front end of the outer cylinder. The pull rod slides through the outer cylinder and the inside of the clamping head. The cylinder is fixed behind the geared motor, and the rear end of the pull rod is movably and fixedly connected to the piston rod of the cylinder through a coupling 6. The clamping head extends into the faucet housing. The cylinder drives the pull rod to slide back and forth, causing the tensioning block at the front end of the pull rod to move backward to support the clamping head and tension the faucet housing, or to move forward to release the faucet housing. The geared motor drives the outer cylinder to rotate the clamping head and the pull rod, thereby rotating the faucet housing to cooperate with the external grinding parts for grinding.

[0003] In existing technologies, the components of tensioning mechanisms are assembled and connected along the front-to-back direction, resulting in a relatively long lateral length. This requires a large working space when the tensioning mechanism rotates as a whole, which is not conducive to the compact circular array distribution of the tensioning mechanism on a rotary table. Therefore, this invention proposes a rotary tensioning mechanism that reduces the working space of the tensioning mechanism. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model proposes a rotary tensioning mechanism to solve the problem that the existing tensioning mechanism has a large working space and is not conducive to compact ring distribution.

[0005] To solve the above-mentioned technical problems, the solution adopted by this utility model is as follows: a rotary tensioning mechanism, including a mounting base consisting of a base plate and a vertical plate, an outer cylinder, a pull rod, a clamping head, a geared motor, and a cylinder. The base plate of the mounting base is rotatably fixed to an external platform. The housing of the geared motor is fixedly disposed on the back of the vertical plate of the mounting base. The outer cylinder passes through the vertical plate and is fixedly disposed inside the hollow rotating shaft of the geared motor. The clamping head is detachably fixed to the front end of the outer cylinder. The pull rod is movably disposed inside the outer cylinder and the clamping head. The housing of the cylinder is fixedly disposed in front of the vertical plate. The piston rod of the cylinder passes through the vertical plate and is horizontally fixedly connected to a drive rod. The back of the vertical plate is horizontally fixedly disposed on a fixed plate above the geared motor. A movable plate is vertically disposed between the fixed plate and the drive rod. The upper end of the movable plate is hinged to the rear end of the fixed plate, and the lower end is hinged above the fixed plate and pivotally disposed at the rear end of the drive rod. The pull rod slides horizontally and rotates in the front-back direction in the middle of the movable plate.

[0006] A further improvement is that an adaptive structure is provided between the rear end of the pull rod and the middle of the movable plate to accommodate the back-and-forth swing of the movable plate and the rotation of the pull rod, and to horizontally drive the pull rod to slide back and forth.

[0007] A further improvement is that the adaptive structure includes a mounting port that extends through the middle of the movable plate in the front-to-back direction, a spherical bearing is provided in the mounting port, the outer ring of the spherical bearing is fixedly disposed in the mounting port, and the rear end of the pull rod is fixedly disposed in the inner ring of the spherical bearing.

[0008] A further improvement is that the adaptive structure includes a mounting port that extends through the middle of the movable plate in the front-to-back direction, a self-aligning spherical bearing is provided in the mounting port, the outer ring of the self-aligning spherical bearing is fixedly disposed in the mounting port, and the rear end of the pull rod is fixedly disposed in the inner ring of the self-aligning spherical bearing.

[0009] A further improvement is that an internally threaded connecting cylinder is fixedly inserted inside the inner ring, and the rear end of the pull rod is threaded to the internally threaded connecting cylinder to adjust the position of the front end of the pull rod.

[0010] A further improvement is that the inner diameter of the rear section of the mounting port is larger than that of the front section, forming a push-up protrusion. The outer ring is movably filled in the rear section of the mounting port, and the front end face of the outer ring abuts against the push-up protrusion. A push-up ring is detachably and fixedly provided on the movable plate, abutting against the rear end face of the outer ring to restrict the movement of the outer ring.

[0011] A further improvement is that the adaptive structure includes a mounting opening that extends through the middle of the movable plate in the front-to-back direction, a pull rod that extends through the mounting opening, a movable gap that is formed between the inner wall of the mounting opening and the pull rod, and a fixing plate that is adjustablely provided at the rear end of the pull rod, wherein the outer diameter of the fixing plate is larger than the diameter of the mounting opening.

[0012] A further improvement is that: the rear end of the drive rod is provided with a first rotation clearance groove, the lower end of the movable plate is provided with a first rotation protrusion, the first rotation protrusion is provided with a sliding groove extending through in the vertical direction, and a first hinge pin is fixedly provided horizontally through in the first rotation clearance groove in the horizontal direction, and the first hinge pin is movably inserted in the sliding groove.

[0013] A further improvement is that: the rear end of the fixed plate is provided with a second rotation clearance groove, the upper end of the movable plate is provided with a second rotation protrusion, a second hinge pin is provided through the second rotation clearance groove from left to right, and the second rotation protrusion is hinged in the second rotation clearance groove with the second hinge pin as the rotation center.

[0014] A further improvement is that the tensioning block at the front end of the pull rod is a separate component that is easy to disassemble and replace.

[0015] By adopting the aforementioned technical solution, the beneficial effects of this utility model are:

[0016] 1. By fixing the cylinder and geared motor separately on the front and rear end faces of the mounting base plate, the cylinder, motor, and outer cylinder are arranged in a double-layer structure, changing the existing layout where the cylinder is fixed behind the geared motor. This effectively shortens the lateral length of the tensioning mechanism. Simultaneously, the tie rod and movable plate are rotatably connected via bearings, avoiding the use of couplings or other additional length-increasing rotatable structures, further reducing the lateral dimension and significantly decreasing the working range of a single tensioning mechanism. This facilitates compact arrangement on the rotary table, allowing for a greater number of tensioning mechanisms to be installed. This enables the grinding of more workpieces within the same timeframe, thereby improving overall grinding efficiency and meeting the demands of high-efficiency processing in industrial production.

[0017] 2. The adaptive structure set at the rear end of the pull rod and the middle of the movable plate adopts a spherical bearing or a self-aligning ball bearing, which can adapt to the back-and-forth swing of the movable plate and the rotation of the pull rod, while realizing the back-and-forth sliding of the pull rod. The structure is simple and ensures the stability and reliability of the mechanism under complex motion conditions.

[0018] 3. The pull rod and the internally threaded connecting sleeve are connected by a thread, allowing for flexible adjustment of the pull rod's front end position to accommodate clamp heads of different lengths. The tensioning block at the front end of the pull rod is a separate unit, facilitating disassembly and replacement, and can accommodate clamp heads with different inner diameters. This enhances the versatility of the tensioning mechanism and reduces equipment replacement costs and usage limitations.

[0019] 4. The inner diameter of the rear section of the mounting port is larger than that of the front section, forming a support protrusion. This, along with the support ring that can be detachably and fixedly installed on the movable plate, restricts the movement of the bearing within the mounting port. This facilitates the disassembly and replacement of the bearing, improves the maintenance efficiency of the equipment, reduces downtime, and ensures production continuity. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the prior art in the background technology of this utility model.

[0021] Figure 2 This is a schematic diagram of the installation of a rotary tensioning mechanism and an external rotary table according to an embodiment of this utility model.

[0022] Figure 3 This is a three-dimensional structural diagram of a rotary tensioning mechanism according to an embodiment of the present invention.

[0023] Figure 4 This is a side view of a rotating tensioning mechanism according to an embodiment of the present invention.

[0024] Figure 5 This is a rear view structural schematic diagram of a rotary tensioning mechanism according to an embodiment of the present invention.

[0025] Figure 6 yes Figure 5 A schematic diagram of the internal structure along the RR line.

[0026] Figure 7 yes Figure 6 Enlarged view of the local structure at point A in the middle.

[0027] Figure 8 This is a schematic diagram of another embodiment of the adaptive structure in a rotary tensioning mechanism according to an embodiment of this utility model. Detailed Implementation

[0028] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0029] refer to Figures 2 to 7This utility model discloses a rotary tensioning mechanism, including a mounting base 10 composed of a base plate and a vertical plate, an outer cylinder 11, a pull rod 12, a clamping head 13, a reduction motor 14, and a cylinder 15. The reduction motor 14 is a reduction motor with a hollow rotating shaft. The base plate 101 of the mounting base 10 is rotatably fixed to the edge of an external rotating platform. The housing of the reduction motor 14 is fixedly disposed on the back of the vertical plate 102 of the mounting base 10. The outer cylinder 11 passes through the vertical plate and is fixedly disposed inside the hollow rotating shaft of the reduction motor 14. The clamping head 13 is detachably fixed to the front end of the outer cylinder 11. The pull rod 12 is detachably fixed to the front end of the outer cylinder 11. The cylinder 15 is movably inserted into the outer cylinder 11 and the clamp head 13. The housing of the cylinder 15 is fixedly installed in front of the vertical plate. The piston rod of the cylinder 15 passes through the vertical plate and is horizontally fixedly connected to the drive rod 16. The back of the vertical plate is horizontally fixedly installed above the reduction motor 14 on the fixed plate 17. A movable plate 18 is vertically installed between the fixed plate 17 and the drive rod 16. The upper end of the movable plate 18 is hinged to the rear end of the fixed plate 17, and the lower end is hinged above the drive rod 16 as the rotation center and can swing back and forth. The pull rod 12 is horizontally slidable and rotated in the middle of the movable plate 18 in the front-back direction.

[0030] The drive rod 16 has a first rotation clearance groove 19 at its rear end, and the movable plate 18 has a first rotation protrusion 20 at its lower end. The first rotation protrusion 20 has a sliding groove 21 extending through it in the vertical direction. A first hinge pin 22 is fixedly installed horizontally through the first rotation clearance groove 19 in the horizontal direction. The first hinge pin 22 is movably inserted into the sliding groove 21. The fixed plate 17 has a second rotation clearance groove 23 at its rear end, and the movable plate 18 has a second rotation protrusion 24 at its upper end. A second hinge pin 25 extends through the second rotation clearance groove 23 in the horizontal direction. The second rotation protrusion 24 is hinged to the second rotation clearance groove 23 with the second hinge pin 25 as its rotation center.

[0031] An adaptive structure is provided between the rear end of the pull rod 12 and the middle of the movable plate 18 to accommodate the back-and-forth swing of the movable plate 18 and the rotation of the pull rod 12, and to horizontally drive the pull rod 12 to slide back and forth. The adaptive structure includes a mounting opening 26 extending through the middle of the movable plate 18 in the front-and-back direction. A spherical plain bearing or a self-aligning ball bearing 27 is provided in the mounting opening 26, preferably a spherical plain bearing, but a self-aligning ball bearing can also be used when the deflection angle is less than 3 degrees. The outer ring 271 of the spherical plain bearing or the self-aligning ball bearing 27 is fixedly disposed in the mounting opening 26, and the rear end of the pull rod 12 is fixedly disposed in the inner ring 272 of the spherical plain bearing or the self-aligning ball bearing.

[0032] Furthermore, an internally threaded connecting sleeve 28 is fixedly inserted into the inner ring, and the rear end of the pull rod 12 is threaded to the internally threaded connecting sleeve 28 to adjust the position of the front end of the pull rod 12. The position of the front end of the pull rod 12 is adjusted by the threaded connection position between the pull rod 12 and the internally threaded connecting sleeve 28 to accommodate clamp heads 13 of different lengths. Furthermore, the tensioning block 30 at the front end of the pull rod 12 is a separate unit for easy disassembly and replacement to accommodate clamp heads 13 of different inner diameters. The tensioning block 30 is connected to the pull rod 12 by bolts. The separate design of the tensioning block and the internally threaded connecting sleeve 28 enhance the versatility of the tensioning mechanism.

[0033] Furthermore, the inner diameter of the rear section of the mounting port 26 is larger than that of the front section, forming abutment protrusion 31. The outer ring is movably filled in the rear section of the mounting port 26, which facilitates the installation and replacement of the bearing. The front end face of the outer ring abuts against the abutment protrusion 31. Abutment ring 32 is detachably and fixedly provided on the movable plate 18 to abut against the rear end face of the outer ring and restrict the movement of the outer ring. The abutment ring 32 does not affect the deflection movement of the inner ring.

[0034] The core design principle of a rotary tensioning mechanism:

[0035] In the prior art, the cylinder 15 is fixed behind the geared motor 14, increasing the lateral length of the mechanism. Furthermore, the cylinder 15 is directly connected to the tie rod 12, requiring a rotatable coupling to avoid affecting the rotation of the tie rod 12, further lengthening the mechanism. In this invention, the cylinder 15 and the geared motor 14 are respectively fixedly mounted on the front and rear ends of the vertical plate of the mounting base 10. The cylinder 15, geared motor 14, and outer cylinder 11 form a double-layered structure, shortening the lateral length of the tensioning mechanism. Additionally, the tie rod 12 is rotatably connected to the movable plate 18 via bearings, further reducing the lateral length and thus narrowing the working range of a single tensioning mechanism. This allows for a compact arrangement of the tensioning mechanism on the rotary table, improving grinding efficiency.

[0036] Based on the aforementioned technical solution, see Figure 8 The adaptive structure may further include a second mounting port 33 that extends through the middle of the movable plate 18 in the front-back direction, the pull rod 12 is disposed through the mounting port 26, an movable gap 34 is formed between the inner wall of the second mounting port 33 and the pull rod 12, and a fixing plate 35 is adjustablely disposed at the rear end of the pull rod 12, the outer diameter of the fixing plate being larger than the diameter of the second mounting port 33.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions above are only illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A rotary tensioning mechanism, comprising a mounting base consisting of a base plate and a vertical plate, an outer cylinder, a tie rod, a clamping head, a geared motor, and a cylinder, wherein the base plate of the mounting base is rotatably fixed to an external platform, the housing of the geared motor is fixedly disposed on the back side of the vertical plate of the mounting base, the outer cylinder passes through the vertical plate and is fixedly disposed within the hollow rotating shaft of the geared motor, the clamping head is detachably fixed to the front end of the outer cylinder, and the tie rod is movably disposed within the outer cylinder and the clamping head, characterized in that: The cylinder housing is fixedly mounted on the front of the upright plate. The piston rod of the cylinder passes through the upright plate and is horizontally fixedly connected to a drive rod. The back of the upright plate is horizontally fixedly mounted on a fixed plate above the reduction motor. A movable plate is vertically mounted between the fixed plate and the drive rod. The upper end of the movable plate is hinged to the rear end of the fixed plate, and the lower end is hinged above the fixed plate as the rotation center and can swing back and forth, hinged to the rear end of the drive rod. The pull rod is horizontally sliding and rotating in the front-back direction and is mounted in the middle of the movable plate.

2. The rotary tensioning mechanism according to claim 1, characterized in that: An adaptive structure is provided between the rear end of the pull rod and the middle of the movable plate to accommodate the back-and-forth swing of the movable plate and the rotation of the pull rod, and to drive the pull rod to slide back and forth horizontally.

3. The rotary tensioning mechanism according to claim 2, characterized in that: The adaptive structure includes a mounting port that extends through the middle of the movable plate in the front-to-back direction. A spherical bearing is provided in the mounting port. The outer ring of the spherical bearing is fixedly disposed in the mounting port. The rear end of the pull rod is fixedly disposed in the inner ring of the spherical bearing.

4. A rotary tensioning mechanism according to claim 2, characterized in that: The adaptive structure includes a mounting port that extends through the middle of the movable plate in the front-to-back direction. A self-aligning spherical bearing is provided in the mounting port. The outer ring of the self-aligning spherical bearing is fixedly disposed in the mounting port. The rear end of the pull rod is fixedly disposed in the inner ring of the self-aligning spherical bearing.

5. A rotary tensioning mechanism according to claim 3 or 4, characterized in that: An internally threaded connecting cylinder is fixedly inserted inside the inner ring, and the rear end of the pull rod is threaded to the internally threaded connecting cylinder to adjust the position of the front end of the pull rod.

6. A rotary tensioning mechanism according to claim 3 or 4, characterized in that: The inner diameter of the rear section of the mounting port is larger than that of the front section, forming a top protrusion. The outer ring is movably filled in the rear section of the mounting port, and the front end face of the outer ring abuts against the top protrusion. A top ring is detachably and fixedly installed on the movable plate, abutting against the rear end face of the outer ring to restrict the movement of the outer ring.

7. A rotary tensioning mechanism according to claim 2, characterized in that: The adaptive structure includes a mounting opening that extends through the middle of the movable plate in the front-to-back direction. The pull rod is disposed through the mounting opening, and an movable gap is formed between the inner wall of the mounting opening and the pull rod. A fixing plate is adjustablely disposed at the rear end of the pull rod, and the outer diameter of the fixing plate is larger than the diameter of the mounting opening.

8. A rotary tensioning mechanism according to claim 1 or 2, characterized in that: The drive rod has a first rotation clearance groove at its rear end and a first rotation protrusion at its lower end. The first rotation protrusion has a sliding groove extending through it in the vertical direction. A first hinge pin is fixedly installed horizontally through the first rotation clearance groove in the horizontal direction. The first hinge pin is movably inserted into the sliding groove.

9. A rotary tensioning mechanism according to claim 1 or 2, characterized in that: The fixed plate has a second rotation clearance groove at its rear end, and the movable plate has a second rotation protrusion at its upper end. A second hinge pin is provided through the second rotation clearance groove from left to right. The second rotation protrusion is hinged in the second rotation clearance groove with the second hinge pin as the rotation center.

10. A rotary tensioning mechanism according to claim 1 or 2, characterized in that: The tensioning block at the front end of the pull rod is a separate component that is easy to disassemble and replace.

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