A new type of polishing device for bone plate processing

Abstract

The utility model relates to the technical field of bone plate processing, in particular to a novel polishing device for bone plate processing, which is convenient for batch polishing of holes on bone plates by setting the device, saves labor, reduces production costs and improves polishing efficiency; it comprises a base, a rotating frame, a rotating shaft, a coil spring, a sliding device, a grinding device, a driving device, a clamping mechanism and a card-mounting mechanism, the rotating shaft is rotatably mounted in the middle of the base, the rotating frame is mounted on the top of the rotating shaft, the coil spring is sleeved on the lower part of the rotating shaft, the card-mounting mechanism is mounted on the bottom end of the base, the card-mounting mechanism is connected to the bottom end of the rotating shaft, one end of the coil spring is connected to the bottom end of the base, the other end of the coil spring is cooperatively connected to the clamping mechanism, the sliding device is mounted on the rotating frame, the grinding device is mounted on the rotating frame, the grinding device is cooperatively connected to the sliding device, the driving device is mounted on the base, and the clamping mechanism is mounted on the driving device.

Description

Technical Field

[0001] The utility model relates to the technical field of bone plate processing, in particular to a novel polishing device for bone plate processing. Background Art

[0002] Bone plates are perforated plate-shaped internal fixation devices for fractures. They are often used in conjunction with bone screws or bone wires in clinical practice. They are divided into two categories: ordinary bone plates and compression bone plates. They can be made into strips, Y-shapes, L-shapes, T-shapes, etc. according to different uses.

[0003] The holes of the bone plate need to be polished during processing. The holes are polished by a polishing wheel, but this requires manual operation and cannot be polished in batches, resulting in low polishing efficiency and high cost. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a novel polishing device for bone plate processing, which is convenient for batch polishing of holes on bone plates by setting up this equipment, saves labor, reduces production costs, and improves polishing efficiency.

[0005] The utility model discloses a novel polishing device for bone plate processing, comprising a base, a rotating frame, a rotating shaft, a coil spring, a sliding device, a grinding device, a driving device, a clamping mechanism and a clamping mechanism. The rotating shaft is rotatably installed in the middle of the base, the rotating frame is installed at the top of the rotating shaft, the coil spring is sleeved at the lower part of the rotating shaft, the clamping mechanism is installed at the bottom end of the base, the clamping mechanism is connected to the bottom end of the rotating shaft, one end of the coil spring is connected to the bottom end of the base, and the other end of the coil spring is cooperatively connected to the clamping mechanism, the sliding device is installed on the rotating frame, the grinding device is installed on the rotating frame, the grinding device is cooperatively connected to the sliding device, the driving device is installed on the base, and the clamping mechanism is installed on the driving device.

[0006] Preferably, it also includes a knob, which is installed in the middle of the rotating shaft.

[0007] Preferably, the sliding device includes two groups of first bolts and a slide seat, the front end and the rear end of the rotating frame are connected with sliding grooves, the slide seat slides on the rotating frame, the two groups of first bolts pass through the two groups of sliding grooves respectively and are threadedly connected to the slide seat, and the grinding device is installed on the slide seat.

[0008] Preferably, the polishing device includes a first motor, a first bevel gear, a polishing rod, a second bevel gear and a mounting frame, the first motor is installed at the right end of the slide, the output end of the first motor passes through the right end of the slide and is connected to the first bevel gear, the mounting frame is installed at the left end of the slide, the polishing rod is rotatably installed on the top of the mounting frame, the second bevel gear is installed at the bottom end of the polishing rod, and the second bevel gear is meshed with the first bevel gear.

[0009] Preferably, the driving device includes two groups of movable plates, two groups of hinge rods, two groups of columns, two groups of cams, two groups of second motors and two groups of fixed frames. The two groups of movable plates are slidingly connected on the left and right sides of the top of the base, respectively. The two groups of columns are respectively installed on the lower sides of the outer ends of the two groups of movable plates, the two groups of hinge rods are rotatably installed on the two groups of columns, the two groups of fixed frames are respectively installed on the left and right ends of the base, the two groups of second motors are respectively installed on the outer ends of the two groups of fixed frames, the output ends of the two groups of second motors pass through the two groups of fixed frames and are connected with the two groups of cams, the two groups of cams are rotatably connected with the two groups of hinge rods, and the clamping mechanism is installed on the two groups of movable plates.

[0010] Preferably, the clamping mechanism includes two groups of second bolts, two groups of third bolts, two groups of clamping plates and two groups of sliding rods. The upper parts of the two groups of movable plates are connected with sliding holes. The two groups of sliding rods are respectively slidably connected with the sliding holes of the two groups of movable plates. The top ends of the sliding holes of the two groups of movable plates are connected with threaded holes. The two groups of third bolts are respectively threadedly connected with the threaded holes of the two groups of movable plates. The two groups of third bolts are respectively tightened against the two groups of sliding rods. The two groups of clamping plates are respectively installed on the inner ends of the two groups of sliding rods. The top ends of the two groups of clamping plates are connected with threaded holes. The two groups of second bolts are respectively threadedly connected with the threaded holes at the top ends of the two groups of clamping plates.

[0011] Preferably, the clamping mechanism includes a clamping block, a handle, a spring, a fixed seat and a connecting rod, the clamping block is installed at the bottom end of the rotating shaft, the bottom end of the coil spring is connected to the top end of the clamping block, the left and right ends of the clamping block are provided with clamping grooves, the fixed seat is installed on the left side of the bottom end of the base, a sliding hole is provided in the middle part of the fixed seat, the connecting rod is slidably connected to the sliding hole of the fixed seat, the connecting rod is clamped in cooperation with the clamping block slot, the handle is installed at the left end of the connecting rod, the spring is sleeved on the connecting rod, one end of the spring is connected to the connecting rod, and the other end of the spring is connected to the left end of the fixed seat.

[0012] Preferably, a rubber pad is provided on the inner side of the card plate.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: by releasing the limit of the rotating shaft by the clamping mechanism, and by rotating the rotating shaft, the rotating shaft drives the rotating frame to rotate, thereby adjusting the angle of the grinding device, and the coil spring is deformed. After the grinding device is adjusted to a suitable position, the rotating shaft is fixed by the clamping mechanism, thereby fixing the grinding device, and then the bone plate is fixed by the clamping mechanism, and then the position of the grinding device is adjusted according to the position of the hole in the bone plate, so that the sliding device drives the grinding device to slide on the rotating frame to a specified position and fix it, and then the grinding device is turned on, and the driving device is turned on at the same time, the driving device drives the bone plate on the clamping mechanism to move up and down, and the grinding device is extended into the hole of the bone plate for grinding and polishing. By setting this equipment, it is convenient to polish the holes on the bone plate in batches, saving labor, reducing production costs, and improving polishing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a structural schematic diagram of the utility model;

[0015] Figure 2 yes Figure 1 A schematic diagram of the second perspective structure;

[0016] Figure 3 yes Figure 1 A is a schematic diagram of the enlarged structure of the middle part;

[0017] Figure 4 yes Figure 2 Schematic diagram of the enlarged structure of B;

[0018] Markings in the accompanying drawings: 1. base; 2. rotating frame; 3. rotating shaft; 4. coil spring; 5. knob; 6. first bolt; 7. sliding groove; 8. sliding seat; 9. first motor; 10. first bevel gear; 11. polishing rod; 12. second bevel gear; 13. mounting frame; 14. moving plate; 15. hinge rod; 16. column; 17. cam; 18. second motor; 19. fixing frame; 20. second bolt; 21. third bolt; 22. clamping plate; 23. sliding rod; 24. clamping block; 25. handle; 26. spring; 27. fixing seat; 28. connecting rod. DETAILED DESCRIPTION

[0019] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] like Figures 1 to 4 As shown, the utility model is a novel polishing device for bone plate processing, comprising a base 1, a rotating frame 2, a rotating shaft 3, a coil spring 4, a sliding device, a grinding device, a driving device, a clamping mechanism and a clamping mechanism, the rotating shaft 3 is rotatably mounted in the middle of the base 1, the rotating frame 2 is mounted on the top of the rotating shaft 3, the coil spring 4 is sleeved on the lower part of the rotating shaft 3, the clamping mechanism is mounted on the bottom end of the base 1, the clamping mechanism is connected to the bottom end of the rotating shaft 3, one end of the coil spring 4 is connected to the bottom end of the base 1, and the other end of the coil spring 4 is connected to the clamping mechanism, the sliding device is mounted on the rotating frame 2, the grinding device is mounted on the rotating frame 2, the grinding device is connected to the sliding device, the driving device is mounted on the base 1, and the clamping mechanism is mounted on the driving device;

[0021] By releasing the limit of the rotating shaft 3 by the clamping mechanism and rotating the rotating shaft 3, the rotating shaft 3 drives the rotating frame 2 to rotate, thereby adjusting the angle of the grinding device, and the coil spring 4 is deformed. After the grinding device is adjusted to a suitable position, the rotating shaft 3 is fixed by the clamping mechanism, thereby fixing the grinding device, and then fixing the bone plate by the clamping mechanism. Thereafter, the position of the grinding device is adjusted according to the position of the hole in the bone plate, so that the sliding device drives the grinding device to slide on the rotating frame 2 to a specified position and fix it, and then the grinding device is turned on, and the driving device is turned on at the same time, the driving device drives the bone plate on the clamping mechanism to move up and down, and the grinding device is extended into the hole of the bone plate for grinding and polishing. By setting up this equipment, it is convenient to carry out batch polishing of the holes on the bone plate, saving labor, reducing production costs, and improving polishing efficiency.

[0022] As a preferred embodiment of the above, it further includes a knob 5, which is installed in the middle of the rotating shaft 3;

[0023] By providing the knob 5 and rotating the rotating shaft 3 by rotating the knob 5 , the rotating shaft 3 can be easily rotated.

[0024] As a preferred embodiment of the above, the sliding device includes two groups of first bolts 6 and a slide seat 8. The front end and the rear end of the rotating frame 2 are both connected to each other with a sliding groove 7. The slide seat 8 slides on the rotating frame 2. The two groups of first bolts 6 pass through the two groups of sliding grooves 7 and are threadedly connected to the slide seat 8. The grinding device is installed on the slide seat 8.

[0025] By setting the first bolt 6, the sliding groove 7 and the sliding seat 8, the sliding seat 8 is made to slide on the rotating frame 2 to adjust the position of the grinding device. After the grinding device corresponds to the position of the bone plate hole, the two groups of first bolts 6 are rotated, and the two groups of first bolts 6 are threadedly connected with the sliding seat 8, thereby fixing the sliding seat 8 to adjust the position of the grinding device.

[0026] As a preferred embodiment of the above, the grinding device includes a first motor 9, a first bevel gear 10, a polishing rod 11, a second bevel gear 12 and a mounting frame 13, the first motor 9 is mounted on the right end of the slide 8, the output end of the first motor 9 passes through the right end of the slide 8 and is connected to the first bevel gear 10, the mounting frame 13 is mounted on the left end of the slide 8, the polishing rod 11 is rotatably mounted on the top of the mounting frame 13, the second bevel gear 12 is mounted on the bottom end of the polishing rod 11, and the second bevel gear 12 is meshed with the first bevel gear 10;

[0027] By setting the first motor 9, the first bevel gear 10, the polishing rod 11, the second bevel gear 12 and the mounting frame 13, by turning on the first motor 9, the first motor 9 drives the first bevel gear 10 to rotate, the first bevel gear 10 is meshed with the second bevel gear 12, the second bevel gear 12 drives the polishing rod 11 to rotate, and the polishing rod 11 polishes the holes on the bone plate, thereby playing the role of polishing the holes in the bone plate.

[0028] As a preferred embodiment of the above, the driving device includes two groups of moving plates 14, two groups of hinge rods 15, two groups of columns 16, two groups of cams 17, two groups of second motors 18 and two groups of fixed frames 19. The two groups of moving plates 14 are respectively slidably connected on the left and right sides of the top of the base 1, the two groups of columns 16 are respectively installed on the lower sides of the outer ends of the two groups of moving plates 14, the two groups of hinge rods 15 are respectively rotatably installed on the two groups of columns 16, the two groups of fixed frames 19 are respectively installed on the left and right ends of the base 1, the two groups of second motors 18 are respectively installed on the outer ends of the two groups of fixed frames 19, the output ends of the two groups of second motors 18 respectively pass through the two groups of fixed frames 19 and are connected with the two groups of cams 17, the two groups of cams 17 are rotatably connected with the two groups of hinge rods 15, and the clamping mechanism is installed on the two groups of moving plates 14;

[0029] By setting the movable plate 14, the hinge rod 15, the column 16, the cam 17, the second motor 18 and the fixed frame 19, by turning on the two groups of second motors 18, the two groups of second motors 18 drive the two groups of cams 17 to rotate, and the two groups of cams 17 drive the two groups of movable plates 14 to slide up and down on the base 1 through the two groups of hinge rods 15, and the clamping mechanisms on the two groups of movable plates 14 drive the bone plate to slide up and down, so that the rotating polishing rod 11 polishes the hole of the bone plate, which plays a role in driving the bone plate to move up and down.

[0030] As a preferred embodiment of the above embodiment, the clamping mechanism includes two groups of second bolts 20, two groups of third bolts 21, two groups of card plates 22 and two groups of sliding rods 23. The upper parts of the two groups of movable plates 14 are connected with sliding holes. The two groups of sliding rods 23 are respectively slidably connected with the sliding holes of the two groups of movable plates 14. The top ends of the sliding holes of the two groups of movable plates 14 are connected with threaded holes. The two groups of third bolts 21 are respectively threadedly connected with the threaded holes of the two groups of movable plates 14. The two groups of third bolts 21 are respectively tightened against the two groups of sliding rods 23. The two groups of card plates 22 are respectively installed on the inner ends of the two groups of sliding rods 23. The top ends of the two groups of card plates 22 are connected with threaded holes. The two groups of second bolts 20 are respectively threadedly connected with the threaded holes at the top ends of the two groups of card plates 22.

[0031] By setting the second bolt 20, the third bolt 21, the clamping plate 22 and the sliding rod 23, the spacing between the two groups of clamping plates 22 is adjusted according to the size of the bone plate, so that the two groups of sliding rods 23 slide in the sliding holes of the two groups of movable plates 14. When the two groups of clamping plates 22 are adjusted to a suitable spacing, the two groups of third bolts 21 are rotated, the two groups of third bolts 21 are threadedly connected to the two groups of movable plates 14, and the two groups of third bolts 21 tighten and fix the two groups of sliding rods 23, and then the bone plate is placed inside the two groups of clamping plates 22, and then the two groups of second bolts 20 are rotated, the two groups of second bolts 20 are threadedly connected to the two groups of clamping plates 22, and the two groups of second bolts 20 are tightened and fixed to the bone plate, thereby clamping and fixing the bone plate.

[0032] As a preferred embodiment of the above embodiment, the clamping mechanism includes a clamping block 24, a handle 25, a spring 26, a fixing seat 27 and a connecting rod 28. The clamping block 24 is installed at the bottom end of the rotating shaft 3, the bottom end of the coil spring 4 is connected to the top of the clamping block 24, the left and right ends of the clamping block 24 are provided with a clamping groove, the fixing seat 27 is installed on the left side of the bottom end of the base 1, and a sliding hole is provided in the middle of the fixing seat 27. The connecting rod 28 is slidably connected to the sliding hole of the fixing seat 27, and the connecting rod 28 is clamped in cooperation with the clamping groove of the clamping block 24. The handle 25 is installed at the left end of the connecting rod 28, the spring 26 is sleeved on the connecting rod 28, one end of the spring 26 is connected to the connecting rod 28, and the other end of the spring 26 is connected to the left end of the fixing seat 27;

[0033] By setting the block 24, the handle 25, the spring 26, the fixing seat 27 and the connecting rod 28, the connecting rod 28 is pulled by the handle 25, the connecting rod 28 is separated from the block 24, and the spring 26 is in a stretched state, and the rotating shaft 3 is driven to rotate by the knob 5, and the rotating shaft 3 drives the rotating frame 2 and the block 24 to rotate. When the rotating frame 2 rotates 180 degrees by the second motor, the handle 25 is released, the spring 26 drives the connecting rod 28 to move rightward, and the connecting rod 28 is engaged with the card slot on the block 24, so that the rotating frame 2 is fixed, thereby playing the role of fixing the rotating frame 2.

[0034] As a preferred embodiment of the above, a rubber pad is provided inside the card plate 22;

[0035] The friction between the clamping plate 22 and the bone plate can be increased, thereby improving the stability of the fixation of the bone plate.

[0036] The utility model discloses a novel polishing device for processing bone plate. When it is working, the connecting rod 28 is first pulled by the handle 25, and the connecting rod 28 is separated from the clamping block 24, and the spring 26 is in a stretched state. The rotating shaft 3 is driven to rotate by the knob 5, and the rotating shaft 3 drives the rotating frame 2 and the clamping block 24 to rotate. When the rotating frame 2 rotates the second motor 180 degrees, the handle 25 is released, and the spring 26 drives the connecting rod 28 to move rightward, and the connecting rod 28 is engaged with the clamping groove on the clamping block 24 to fix the rotating frame 2, and then the spacing between the two groups of clamping plates 22 is adjusted according to the size of the bone plate, so that the two groups of sliding rods 23 slide in the sliding holes of the two groups of movable plates 14. When the two groups of clamping plates 22 are adjusted to a suitable spacing, the two groups of third bolts 21 are rotated, and the two groups of third bolts 21 are threadedly connected with the two groups of movable plates 14. The two groups of third bolts 21 tighten and fix the two groups of sliding rods 23, and then the bone plate is placed inside the two groups of clamping plates 22, and then the two groups of third bolts 21 are rotated. The two sets of second bolts 20 are threadedly connected with the two sets of clamping plates 22, and the two sets of second bolts 20 are tightened and fixed to the bone plate. Then, the slide seat 8 is slid on the rotating frame 2 to adjust the position of the polishing rod 11. After the polishing rod 11 corresponds to the position of the bone plate hole, the two sets of first bolts 6 are rotated, and the two sets of first bolts 6 are threadedly connected with the slide seat 8, so as to fix the slide seat 8, and then the first motor 9 is turned on, and the first motor 9 drives the first bevel gear 10 to rotate, and the first bevel gear 10 is meshed with the second bevel gear 12, and the second bevel gear 12 drives the polishing rod 11 to rotate, and at the same time, the two sets of second motors 18 are turned on, and the two sets of second motors 18 drive the two sets of cams 17 to rotate, and the two sets of cams 17 drive the two sets of moving plates 14 to slide up and down on the base 1 through the two sets of hinge rods 15, and the two sets of clamping plates 22 on the two sets of moving plates 14 drive the bone plate to slide up and down, so that the rotating polishing rod 11 can polish the hole of the bone plate.

[0037] The utility model is a novel polishing device for processing bone plates, and its installation method, connection method or setting method are all common mechanical methods, which can be implemented as long as they can achieve their beneficial effects; the first motor 9 and the second motor 18 of the novel polishing device for processing bone plates of the utility model are purchased on the market, and technicians in the industry only need to install and operate them according to the accompanying instruction manual.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A new type of polishing device for bone plate processing, characterized in that: The invention comprises a base (1), a rotating frame (2), a rotating shaft (3), a coil spring (4), a sliding device, a grinding device, a driving device, a clamping mechanism and a clamping mechanism, wherein the rotating shaft (3) is rotatably mounted in the middle of the base (1), the rotating frame (2) is mounted on the top of the rotating shaft (3), the coil spring (4) is sleeved on the lower part of the rotating shaft (3), the clamping mechanism is mounted on the bottom end of the base (1), the clamping mechanism is connected to the bottom end of the rotating shaft (3), one end of the coil spring (4) is connected to the bottom end of the base (1), and the other end of the coil spring (4) is cooperatively connected to the clamping mechanism, the sliding device is mounted on the rotating frame (2), the grinding device is mounted on the rotating frame (2), the grinding device is cooperatively connected to the sliding device, the driving device is mounted on the base (1), and the clamping mechanism is mounted on the driving device.

2. A novel polishing device for bone plate processing as claimed in claim 1, characterized in that: It also includes a knob (5), which is installed in the middle of the rotating shaft (3).

3. A novel polishing device for bone plate processing as claimed in claim 2, characterized in that: The sliding device comprises two groups of first bolts (6) and a sliding seat (8). The front end and the rear end of the rotating frame (2) are both connected and provided with sliding grooves (7). The sliding seat (8) slides on the rotating frame (2). The two groups of first bolts (6) respectively pass through the two groups of sliding grooves (7) and are threadedly connected with the sliding seat (8). The grinding device is installed on the sliding seat (8).

4. A novel polishing device for bone plate processing as claimed in claim 3, characterized in that: The polishing device comprises a first motor (9), a first bevel gear (10), a polishing rod (11), a second bevel gear (12) and a mounting frame (13), wherein the first motor (9) is mounted on the right end of a slide seat (8), an output end of the first motor (9) passes through the right end of the slide seat (8) and is connected to the first bevel gear (10), the mounting frame (13) is mounted on the left end of the slide seat (8), the polishing rod (11) is rotatably mounted on the top of the mounting frame (13), the second bevel gear (12) is mounted on the bottom end of the polishing rod (11), and the second bevel gear (12) is meshed with the first bevel gear (10).

5. A novel polishing device for bone plate processing as claimed in claim 4, characterized in that: The driving device comprises two groups of moving plates (14), two groups of hinge rods (15), two groups of columns (16), two groups of cams (17), two groups of second motors (18) and two groups of fixed frames (19). The two groups of moving plates (14) are respectively slidably connected on the left and right sides of the top of the base (1), the two groups of columns (16) are respectively installed on the lower sides of the outer ends of the two groups of moving plates (14), the two groups of hinge rods (15) are respectively rotatably installed on the two groups of columns (16), the two groups of fixed frames (19) are respectively installed on the left and right ends of the base (1), the two groups of second motors (18) are respectively installed on the outer ends of the two groups of fixed frames (19), the output ends of the two groups of second motors (18) respectively pass through the two groups of fixed frames (19) and are connected to the two groups of cams (17), the two groups of cams (17) are rotatably connected to the two groups of hinge rods (15), and the clamping mechanism is installed on the two groups of moving plates (14).

6. A novel polishing device for bone plate processing as claimed in claim 5, characterized in that: The clamping mechanism comprises two groups of second bolts (20), two groups of third bolts (21), two groups of clamping plates (22) and two groups of sliding rods (23). The upper parts of the two groups of moving plates (14) are both connected to each other and are provided with sliding holes. The two groups of sliding rods (23) are respectively slidably connected with the sliding holes of the two groups of moving plates (14). The top ends of the sliding holes of the two groups of moving plates (14) are both connected to each other and are provided with threaded holes. The two groups of third bolts (21) are respectively threadedly connected with the threaded holes of the two groups of moving plates (14). The two groups of third bolts (21) are respectively tightened against the two groups of sliding rods (23). The two groups of clamping plates (22) are respectively installed on the inner ends of the two groups of sliding rods (23). The top ends of the two groups of clamping plates (22) are both connected to each other and are provided with threaded holes. The two groups of second bolts (20) are respectively threadedly connected with the threaded holes at the top ends of the two groups of clamping plates (22).

7. A novel polishing device for bone plate processing as claimed in claim 6, characterized in that: The clamping mechanism comprises a clamping block (24), a handle (25), a spring (26), a fixing seat (27) and a connecting rod (28). The clamping block (24) is mounted on the bottom end of the rotating shaft (3). The bottom end of the coil spring (4) is connected to the top end of the clamping block (24). The left and right ends of the clamping block (24) are both provided with clamping grooves. The fixing seat (27) is mounted on the left side of the bottom end of the base (1). A sliding hole is provided in the middle of the fixing seat (27). The connecting rod (28) is slidably connected to the sliding hole of the fixing seat (27). The connecting rod (28) is clamped in cooperation with the clamping groove of the clamping block (24). The handle (25) is mounted on the left end of the connecting rod (28). The spring (26) is sleeved on the connecting rod (28). One end of the spring (26) is connected to the connecting rod (28), and the other end of the spring (26) is connected to the left end of the fixing seat (27).

8. A novel polishing device for processing bone plates as claimed in claim 7, characterized in that: A rubber pad is arranged on the inner side of the clamping plate (22).

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