CN219169632U

CN219169632U - Turning clamp for brake piston ring

Info

Publication number: CN219169632U
Application number: CN202223499225.5U
Authority: CN
Inventors: 蒋荣期; 曾佳林; 邓汉飞; 刘涛
Original assignee: Guangdong Wencan Die Casting Technology Co ltd
Current assignee: Guangdong Wencan Die Casting Technology Co ltd
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2023-06-13
Anticipated expiration: 2032-12-23

Abstract

The utility model relates to the technical field of automobile part manufacturing, and discloses a turning clamp for a brake piston ring, which comprises a clamp body, a positioning plate fixing plate and a product positioning plate which are sequentially arranged; the fixture comprises a fixture body, a fixture pull rod, a rotating sleeve, a pressing block, a guide groove, a jack, a lock rod, a guide groove and a lock rod, wherein the movable connecting plate is arranged in an inner cavity of the fixture body, the center of the movable connecting plate is connected with the machine tool pull rod used for pulling the movable connecting plate to move, the movable connecting plate is provided with the fixture pull rod, the rotating sleeve is arranged on a fixing plate of the positioning plate, the fixture pull rod penetrates through the rotating sleeve, the pressing block is arranged at the end part of the fixture pull rod protruding out of the product positioning plate, the guide groove is arranged on the side wall of the rotating sleeve, the jack is arranged on the fixture pull rod, the lock rod is connected with the guide groove and the jack, and the guide groove is used for guiding the lock rod to drive the fixture pull rod and the pressing block to rotate when sliding in the guide groove. The clamping device is characterized in that the clamping device is provided with a clamping device pull rod, a pressing block is connected with the tail end of the clamping device pull rod, and the clamping device pull rod is connected with the clamping device pull rod.

Description

Turning clamp for brake piston ring

Technical Field

The utility model relates to the technical field of automobile part manufacturing, in particular to a turning clamp for a brake piston ring.

Background

The piston ring has certain elasticity, is generally arranged in a ring groove of the piston, forms a chamber with elements such as the piston, a cylinder sleeve, a cylinder cover and the like to do work, has the functions of sealing, adjusting engine oil, conducting heat, guiding and the like, and is widely applied to various power machines. The prior piston ring clamping fixture is as in the Chinese patent with publication number CN108526937A, and discloses a special fixture for processing piston rings, which comprises a fixture body, a plurality of pressing plates and supporting blocks with the same number as the pressing plates, wherein the plurality of supporting blocks are uniformly distributed on the upper end surface of the fixture body along the circumferential direction, the pressing plates for pressing the piston rings are placed on each supporting block, and the pressing plates are detachably connected with the fixture body. When the inner hole of the piston ring is required to be turned, each pressing plate is moved downwards by rotating the screws one by one, and the piston ring is pressed from a plurality of positions. Or an air cylinder is arranged in the clamp body, the tail end of the air cylinder is connected with the pressing plate, and the pressing plate is driven to move downwards through the shrinkage of the output end of the air cylinder, so that the clamping of the piston ring is realized. The structure drives the pressing plate to move up and down through the screws or the air cylinder drives the pressing plate to move up and down, and the pressing plate can not turn to, so that space can not be vacated for feeding.

It can be seen that there is a need for improvements and improvements in the art.

Disclosure of Invention

In view of the defects of the prior art, the utility model aims to provide a turning clamp for a brake piston ring, which aims to solve the problem that the existing pressing plate cannot be turned when an operator loads materials, so that more space is reserved for loading.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a turning clamp for a brake piston ring comprises a clamp body, a positioning plate fixing plate and a product positioning plate which are sequentially arranged; the fixture comprises a fixture body, and is characterized in that an adjustable connecting plate is arranged in the inner cavity of the fixture body, the center of the adjustable connecting plate is connected with a machine tool pull rod used for pulling the adjustable connecting plate to move, the adjustable connecting plate is provided with a fixture pull rod, a rotating sleeve is arranged on a positioning disc fixing plate, the fixture pull rod penetrates through the rotating sleeve, the fixture pull rod protrudes out of the end part of the product positioning disc, a pressing block is arranged at the end part of the product positioning disc, a guide groove is arranged on the side wall of the rotating sleeve, an inserting hole is formed in the fixture pull rod, a lock rod is connected in the inserting hole, and the guide groove is used for guiding the lock rod to drive the fixture pull rod and the pressing block to rotate when sliding in the guide groove.

The turning clamp for the brake piston ring is characterized in that the head end and the tail end of the guide groove are not on the same horizontal line or the same vertical line.

The turning clamp for the brake piston ring comprises a guide groove and a horizontal section, wherein the guide groove comprises the horizontal section and an inclined section, and the horizontal section is located in a direction away from the pressing block.

The turning clamp for the brake piston ring is characterized in that a pressing nozzle is arranged on the inner side face of the pressing block and used for being abutted to or separated from the outer side face of the brake piston ring.

The turning clamp for the brake piston ring is characterized in that a plurality of limiting blocks are arranged on the product positioning disc along the circumferential direction of the product positioning disc at equal angles, and the diameter of an inner circle surrounded by the limiting blocks is equal to the outer diameter of the brake piston ring.

The turning clamp for the brake piston ring is characterized in that a plurality of supporting blocks are arranged on the product positioning disc along the circumferential direction of the product positioning disc at equal angles, and the outer side faces of the supporting blocks are all used for being abutted with the inner side face of the brake piston ring.

The turning clamp for the brake piston ring is characterized in that an elastic gasket and a locking nut are sleeved on the machine tool pull rod, and two side faces of the elastic gasket are respectively abutted to the side face of the movable connecting plate and the side face of the locking nut.

The turning clamp for the brake piston ring is characterized in that a stroke cushion block is sleeved on the machine tool pull rod, and the stroke cushion block is positioned between the movable connecting plate and the positioning plate fixing plate; the end part of the machine tool pull rod, which is far away from the travel cushion block, sequentially penetrates through the center of the positioning disc fixing plate and the center of the product positioning disc, and a limit screw is arranged on the end part of the machine tool pull rod, and the inner side surface of the limit screw is in butt joint or separation with the outer side surface of the product positioning disc.

The turning clamp for the brake piston ring is characterized in that a U-shaped notch is formed in the movable connecting plate, an opening of the U-shaped notch extends towards the center of the movable connecting plate, the end portion, away from the pressing block, of the clamp pull rod penetrates through the U-shaped notch, a positioning block is arranged on the end portion, away from the pressing block, of the clamp pull rod, and the inner side face of the positioning block is in butt joint with the outer side face of the movable connecting plate.

The turning clamp for the brake piston ring is characterized in that three clamp pull rods are arranged at equal angles along the center of the movable connecting plate, three U-shaped grooves are arranged at equal angles along the center of the movable connecting plate, and two ends of each clamp pull rod are connected with corresponding pressing blocks and positioning blocks.

The beneficial effects are that:

the utility model provides a turning clamp for a brake piston ring, which is characterized in that a clamp body is arranged and used for being connected with a machine tool, a positioning disc fixing plate is used for fixing a product positioning disc, the product positioning disc is used for positioning the brake piston ring, a machine tool pull rod is used for pulling a movable connecting plate to axially move, a rotating sleeve is used for enabling the clamp pull rod to relatively rotate, a guide groove is arranged on the rotating sleeve and is used for driving the clamp pull rod to rotate a lock rod with a certain angle, and a pressing block connected with the tail end of the clamp pull rod is enabled to rotate with the same angle, so that enough space is provided for feeding and discharging of workpieces, and the working efficiency is improved. And the rotation of the clamp pull rod can be realized only through the guide groove and the lock rod, and the structure is simple, but the design is ingenious.

Drawings

Fig. 1 is a schematic structural view of a turning fixture for a brake piston ring according to the present utility model.

Fig. 2 is a cross-sectional view of a turning fixture for a brake piston ring.

Fig. 3 is a schematic structural diagram of the turning clamp for braking piston rings after the clamp body is removed.

Fig. 4 is a schematic diagram of a turning fixture for brake piston rings after the fixture body is removed.

Fig. 5 is a cross-sectional view of the turning jig for a brake piston ring after the jig body is removed.

Fig. 6 is a schematic structural view of the turning fixture for brake piston rings after the fixture body and the positioning plate are removed. A step of

Fig. 7 is a schematic view of the structure of the clamp pull rod, the rotating sleeve and the pressing block.

Fig. 8 is a schematic structural view of a brake piston ring.

Description of main reference numerals: 10-clamp body, 11-positioning plate fixing plate, 12-product positioning plate, 121-limiting block, 122-supporting block, 20-movable connecting plate, 21-U-shaped notch, 30-machine tool pull rod, 31-elastic gasket, 32-locking nut, 33-stroke cushion block, and 34-limit screw rods, 40-clamp pull rods, 41-insertion holes, 42-positioning blocks, 421-planes, 422-cambered surfaces, 50-rotating sleeves, 51-guide grooves, 501-horizontal sections, 502-inclined sections, 60-pressing blocks, 61-pressing nozzles and 100-brake piston rings.

Detailed Description

The utility model provides a turning clamp for a brake piston ring, which is used for making the purpose, the technical scheme and the effect of the utility model clearer and more definite, and the utility model is further described in detail below by referring to the attached drawings and examples. It should be understood that the detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the utility model.

Referring to fig. 1 to 8, the present utility model provides a turning fixture for a brake piston ring, comprising a fixture body 10, a positioning plate fixing plate 11 and a product positioning plate 12, which are sequentially arranged; the fixture comprises a fixture body 10, wherein a movable connecting plate 20 is arranged in an inner cavity of the fixture body 10, the center of the movable connecting plate 20 is connected with a machine tool pull rod 30 used for pulling the movable connecting plate 20 to move, the movable connecting plate 20 is provided with a fixture pull rod 40, a positioning plate fixing plate 11 is provided with a rotary sleeve 50, the fixture pull rod 40 penetrates through the rotary sleeve 50, the end part of the fixture pull rod 40 protruding out of a product positioning plate 12 is provided with a pressing block 60, the side wall of the rotary sleeve 50 is provided with a guide groove 51, the fixture pull rod 40 is provided with an inserting hole 41, the guide groove 51 and the inserting hole 41 are connected with a lock rod (in order to display the position of the inserting hole 41, the lock rod is hidden), and the guide groove 51 is used for guiding the lock rod to drive the fixture pull rod 40 and the pressing block 60 to rotate when the lock rod slides in the guide groove 51.

In practical application, the fixture body 10 and the positioning plate fixing plate 11, the positioning plate fixing plate 11 and the product positioning plate 12 are detachably connected through bolts respectively, so that the fixture is convenient to install. The machine tool tie rod 30 is connected with a driving source on the lathe, and the clamp body 10 is connected with the lathe through bolts. The machine tool drives the whole processing fixture to rotate, and the cutter processes the inner circle of the rotating brake piston ring 100.

The present embodiment teaches the principle of operation with the briquette 60 located on the right side. Referring to fig. 3 and 6, an operator places a brake piston ring 100 to be processed in a product positioning plate 12, and the product positioning plate 12 performs preliminary positioning on the brake piston ring 100. Then, a driving source (which may be a driving source with a telescopic function such as a hydraulic cylinder, an air cylinder, etc.) on the machine tool is contracted, the machine tool pull rod 30 is pulled to move leftwards, and since the movable connecting plate 20 is connected with the machine tool pull rod 30, the clamp pull rod 40 is arranged on the movable connecting plate 20, and therefore, both the movable connecting plate 20 and the clamp pull rod 40 are pulled leftwards and move a certain distance, at this time, the clamp pull rod 40 pulls a lock rod positioned at the tail end (right end) of the guide groove 51 to move towards the head end (left end) of the guide groove 51 in the guide groove 51, so that the clamp pull rod 40 and the rotary sleeve 50 are relatively rotated, and a pressing block 60 positioned at the tail end of the clamp pull rod 40 is driven to rotate towards the direction of the brake piston ring 100, so that the pressing block 60 rotates to the right side of the brake piston ring 100. In the process of relatively rotating the clamp pull rod 40 and the rotary sleeve 50, the length of the part of the clamp pull rod 40 protruding out of the product positioning disk 12 is gradually shortened due to continuous shrinkage of the driving source until the left side surface of the pressing block 60 is abutted with the right side surface of the brake piston ring 100, and thus the clamping of the workpiece is completed. And then the machine tool drives the whole processing clamp to rotate, and the cutter processes the workpiece. After finishing processing, the workpiece needs to be withdrawn, at this moment, the driving source stretches to drive the machine tool pull rod 30 and the movable connecting plate 20 to move rightwards, the clamp pull rod 40 rotates under the action of the rotary sleeve 50 and the guide groove 51, the lock rod moves from the head end (left side) of the guide groove 51 to the tail end (right side) of the guide groove 51, in the process of rotating the clamp pull rod 40, the pressing block 60 positioned at the tail end of the clamp pull rod 40 is driven to rotate in the direction away from the workpiece, a larger space is provided for blanking, an operator can conveniently take down the workpiece from the product positioning disc 12, and the next workpiece to be processed is fed.

The structure is characterized in that the product positioning disc 12 for positioning the brake piston ring 100 is arranged, the machine tool pull rod 30 for pulling the movable connecting plate 20 to axially move is used for enabling the clamp pull rod 40 to relatively rotate, the rotating sleeve 50 and the guide groove 51 are arranged on the rotating sleeve 50, the lock rod is used for driving the clamp pull rod 40 to rotate by a certain angle, the pressing block 60 connected with the tail end of the clamp pull rod 40 rotates by the same angle, therefore, enough space is provided for feeding and discharging of workpieces, and the working efficiency is improved. And the rotation of the clamp pull rod 40 can be realized only through the guide groove 51 and the lock rod, and the structure is simple, but the design is ingenious.

Referring to fig. 6 and 7, in some embodiments, the leading end and the tail end of the guiding slot 51 are not on the same horizontal line or the same vertical line. That is, the connecting line of the head end and the tail end of the guide groove 51 forms a certain angle with the horizontal plane or with the vertical line, and the sliding distance of the lock rod on the length of the guide groove 51 is the rotation angle of the pressing block 60.

Referring to fig. 7, in some embodiments, the guide groove 51 includes a horizontal section 501 and an inclined section 502, and the horizontal section 501 is located in a direction away from the pressing block 60. When the lock rod slides on the horizontal segment 501 to the inclined segment 502, the pressing block 60 moves horizontally rightward, that is, the pressing block 60 is separated from the brake piston ring 100, and when the lock rod slides from the head end (left side) of the inclined segment 502 to the tail end (right side) of the inclined segment 502, the pressing block 60 starts to rotate; conversely, when the lock rod slides from the end (right side) of the inclined section 502 to the head end (left side) of the inclined section 502, the pressing block 60 rotates to be located on the right side of the brake piston ring 100, and then when the lock rod slides from the head end of the inclined section 502 to the horizontal section 501, the pressing block 60 gradually moves leftward (approaching the brake piston ring 100) until the left side surface of the pressing block 60 abuts against the right side surface of the brake piston ring 100, and the lock rod slides to the head end (leftmost side) of the horizontal section 501. The above arrangement allows the compact 60 to be separated from the workpiece and then rotated, rather than directly rotated; or the press block 60 is pressed against the workpiece horizontally, not at an angle, so as not to damage the workpiece.

Referring to fig. 1 and 8, in some embodiments, the inner side of the pressing block 60 is provided with a pressing nozzle 61, and the pressing nozzle 61 is used to abut against or separate from the outer side of the brake piston ring 100. The pressing block 60 is detachably connected with the clamp pull rod 40, and the pressing nozzle 61 is detachably connected with the pressing block 60, so that the pressing nozzle 61 can be abutted with a protrusion on the brake piston ring 100 when moving leftwards. In practical application, the size of the pressing nozzle 61 is larger than that of the protrusion, so that the pressing nozzle 61 can completely cover the protrusion, and the clamping effect is improved.

Referring to fig. 2 and 3, in some embodiments, the product positioning disk 12 is provided with a plurality of limiting blocks 121 at equal angles along the circumferential direction thereof, and the diameter of the inner circle surrounded by the limiting blocks 121 is equal to the outer diameter of the brake piston ring 100. The brake piston ring 100 has certain elasticity, namely certain deformability, and can be plugged into the inner walls of the plurality of limiting blocks 121 to perform the function of primarily positioning the workpiece, so that the workpiece is prevented from being shifted to influence the clamping effect of the pressing block 60.

Referring to fig. 3, in some embodiments, the product positioning disk 12 is provided with a plurality of supporting blocks 122 at equal angles along the circumferential direction thereof, and the outer side surfaces of the supporting blocks 122 are used for abutting against the inner side surface of the brake piston ring 100. The supporting block 122 is matched with the limiting block 121 to realize preliminary positioning of the brake piston ring 100, the supporting block 122 limits the position of the brake piston ring 100 plugged into the limiting block 121, and the depth of the brake piston ring 100 is prevented from being plugged too deep, so that the pressing block 60 cannot press the brake piston ring 100, and the machining precision of a cutter is affected.

Referring to fig. 4, in some embodiments, an elastic washer 31 and a lock nut 32 are sleeved on the machine tool pull rod 30, and two side surfaces of the elastic washer 31 respectively abut against a side surface of the movable connecting plate 20 and a side surface of the lock nut 32. The lock nut 32 is used for locking the movable connecting plate 20 on the machine tool pull rod 30, and the elastic gasket 31 has deformability and can strengthen the capability of locking the movable connecting plate 20 by the lock nut 32.

Referring to fig. 4 and 5, in some embodiments, the machine tool pull rod 30 is further sleeved with a travel cushion block 33, and the travel cushion block 33 is located between the movable connecting plate 20 and the positioning plate fixing plate 11; the end part of the machine tool pull rod 30, which is far away from the stroke cushion block 33, sequentially passes through the centers of the positioning disc fixing plate 11 and the product positioning disc 12, and a limit screw 34 is arranged on the end part of the machine tool pull rod 30, and the inner side surface of the limit screw 34 is abutted or separated with the outer side surface of the product positioning disc 12. When the machine tool pull rod 30 moves leftwards, the limit screw 34 is driven to move leftwards until the left side surface of the limit screw 34 is abutted with the right side surface of the product positioning disk 12, at this time, the lock rod is positioned at the head end (left end) of the guide groove 51, and the pressing block 60 is abutted with the brake piston ring 100. When the machine tool pull rod 30 moves rightwards, the limiting screw rod 34 is driven to move rightwards, the limiting screw rod 34 protrudes out of the product positioning disc 12 until the right side surface of the stroke cushion block 33 is abutted with the left side surface of the positioning disc fixing plate 11, at the moment, the lock rod is positioned at the tail end (right end) of the guide groove 51, and the pressing block 60 rotates for a certain angle.

Referring to fig. 4, in some embodiments, the movable connection plate 20 is provided with a U-shaped slot 21 with an opening extending away from the center of the movable connection plate 20, an end portion of the clamp pull rod 40 away from the pressing block 60 passes through the U-shaped slot 21, and an end portion of the clamp pull rod 40 away from the pressing block 60 is provided with a positioning block 42, and an inner side surface of the positioning block 42 abuts against an outer side surface of the movable connection plate 20. The positioning block 42 is provided for bringing the movable connecting plate 20 and the clamp pull rod 40 into a connecting relationship. Specifically, the positioning block 42 and the clamp pull rod 40 are in an integral structure, and when assembled, the clamp pull rod 40 sequentially passes through the positioning plate fixing plate 11 and the rotating sleeve 50 on the product positioning plate 12.

Referring to fig. 7, in some embodiments, any two opposite surfaces of the positioning block 42 are planar surfaces 421, and the other two opposite surfaces are curved surfaces 422, a distance between the two planar surfaces 421 is smaller than a groove width of the U-shaped slot 21, and a distance between the two curved surfaces 422 is larger than the groove width of the U-shaped slot 21. The positioning block 42 is cylindrical and cuts any two opposite faces into a plane 421. The above arrangement is for convenience of installation, since the distance between the two planes 421 is defined to be smaller than the groove width of the U-shaped notch 21, so that the clamp pull rod 40 can sequentially pass through the U-shaped notch 21 on the product positioning plate 12, the positioning plate fixing plate 11 and the movable connecting plate 20, and then the clamp pull rod 40 is rotated so that the two arc surfaces 422 cross the U-shaped notch 21. It should be noted here that, since the clamp lever 40 will rotate relatively, it should be ensured that the curved surface 422 on the rotated angled lever can still cross the U-shaped slot 21 to prevent the clamp lever 40 and the movable connecting plate 20 from losing the connection relationship.

Referring to fig. 1 and 3, in some embodiments, the clamp pull rods 40 are arranged in three at equal angles along the center of the movable connecting plate 20, the U-shaped slots 21 are arranged in three at equal angles along the center of the movable connecting plate 20, and two ends of each clamp pull rod 40 are connected with the corresponding pressing block 60 and the corresponding positioning block 42. The angle between adjacent clamp ties 40 is 120. The clamp pull rod 40 and the press block 60 are both arranged in an equilateral triangle shape, and clamp the brake piston ring 100 in the most stable manner.

In summary, according to the utility model, the clamp body 10 for connecting with a machine tool, the positioning plate fixing plate 11 for fixing the product positioning plate 12, the product positioning plate 12 for positioning the brake piston ring 100, the machine tool pull rod 30 for pulling the movable connecting plate 20 to axially move, the rotating sleeve 50 for relatively rotating the clamp pull rod 40, and the guide groove 51 arranged on the rotating sleeve 50 are arranged, and the lock rod for driving the clamp pull rod 40 to rotate by a certain angle is arranged, so that the pressing block 60 connected with the tail end of the clamp pull rod 40 rotates by the same angle, thereby providing enough space for feeding and discharging of workpieces, and improving the working efficiency. And the rotation of the clamp pull rod 40 can be realized only through the guide groove 51 and the lock rod, and the structure is simple, but the design is ingenious. The leading end and the tail end of the guide groove 51 are defined to be at a certain angle, so that the clamp pull rod 40 drives the pressing block 60 to rotate at the same angle. The horizontal segment 501 and the inclined segment 502 are provided to prevent damage to the workpiece. The press nozzle 61 is provided for enhancing the clamping effect on the workpiece. A stopper 121 and a supporting block 122 are provided for preliminarily positioning the workpiece. An elastic washer 31 and a lock nut 32 are provided for fixing the movable connecting plate 20 to the machine tool drawbar 30. The stroke cushion block 33 and the limit screw 34 are arranged and are used for limiting the moving stroke of the machine tool pull rod 30. A locating block 42 is provided for providing a connection relationship between the articulating plate 20 and the clamp lever 40. The positioning block 42 with the plane 421 and the cambered surface 422 is arranged, so that the assembly of the clamp pull rod 40 is facilitated. The clamp pull rod 40 is defined to have a triangular shape for improving the clamping stability of the workpiece.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, in the description of the present utility model, the meaning of "plurality" is two or more unless explicitly defined otherwise.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

It will be understood that equivalents and modifications will occur to those skilled in the art based on the present utility model and its spirit, and all such modifications and substitutions are intended to be included within the scope of the present utility model.

Claims

1. The turning clamp for the brake piston ring is characterized by comprising a clamp body, a positioning plate fixing plate and a product positioning plate which are sequentially arranged; the fixture comprises a fixture body, and is characterized in that an adjustable connecting plate is arranged in the inner cavity of the fixture body, the center of the adjustable connecting plate is connected with a machine tool pull rod used for pulling the adjustable connecting plate to move, the adjustable connecting plate is provided with a fixture pull rod, a rotating sleeve is arranged on a positioning disc fixing plate, the fixture pull rod penetrates through the rotating sleeve, the fixture pull rod protrudes out of the end part of the product positioning disc, a pressing block is arranged at the end part of the product positioning disc, a guide groove is arranged on the side wall of the rotating sleeve, an inserting hole is formed in the fixture pull rod, a lock rod is connected in the inserting hole, and the guide groove is used for guiding the lock rod to drive the fixture pull rod and the pressing block to rotate when sliding in the guide groove.

2. The turning jig for brake piston rings according to claim 1, wherein the leading end and the trailing end of the guide groove are not on the same horizontal line nor on the same vertical line.

3. The turning jig for brake piston rings of claim 2, wherein the guide groove includes a horizontal section and an inclined section, the horizontal section being located in a direction away from the press block.

4. The turning fixture for a brake piston ring according to claim 1, wherein the inner side surface of the pressing block is provided with a pressing nozzle for abutting against or separating from the outer side surface of the brake piston ring.

5. The turning fixture for a brake piston ring according to claim 1, wherein a plurality of stoppers are provided on the product positioning disk at equal angles along the circumference thereof, and the diameter of an inner circle surrounded by the plurality of stoppers is equal to the outer diameter of the brake piston ring.

6. The turning fixture for a brake piston ring as set forth in claim 5, wherein said product positioning plate is provided with a plurality of support blocks at equal angles along a circumference thereof, and outer side surfaces of said plurality of support blocks are each adapted to abut against an inner side surface of the brake piston ring.

7. The turning clamp for braking piston rings according to claim 1, wherein an elastic washer and a lock nut are sleeved on the machine tool pull rod, and two side surfaces of the elastic washer are respectively abutted with the side surface of the movable connecting plate and the side surface of the lock nut.

8. The turning clamp for braking piston rings according to claim 7, wherein a stroke cushion block is further sleeved on the machine tool pull rod, and the stroke cushion block is positioned between the movable connecting plate and the positioning plate fixing plate; the end part of the machine tool pull rod, which is far away from the travel cushion block, sequentially penetrates through the center of the positioning disc fixing plate and the center of the product positioning disc, and a limit screw is arranged on the end part of the machine tool pull rod, and the inner side surface of the limit screw is in butt joint or separation with the outer side surface of the product positioning disc.

9. The turning clamp for a brake piston ring according to claim 1, wherein a U-shaped notch is provided in the movable connecting plate with an opening extending toward a center away from the movable connecting plate, an end portion of the clamp pull rod away from the press block passes through the U-shaped notch, a positioning block is provided on an end portion of the clamp pull rod away from the press block, and an inner side surface of the positioning block abuts against an outer side surface of the movable connecting plate.

10. The turning jig for brake piston rings according to claim 9, wherein the jig tie bars are equiangularly arranged in three along the center of the movable connecting plate, the U-shaped grooves are equiangularly arranged in three along the center of the movable connecting plate, and both ends of each jig tie bar are connected with the corresponding press block and the positioning block.