A mechanical device

Abstract

The present invention discloses a mechanical device belonging to the technical field of mechanical locking structures. The mechanical device includes an anti-accidental collision locking structure, which includes a first component and a second component that are slidably connected. A rotating shaft is rotatably mounted on the second component, and a driving member is rotatably mounted on the rotating shaft. A force transmission member for circumferentially transmitting torque is provided between the driving member and the rotating shaft. There is an idle distance in the circumferential direction between the force transmission member and at least one of the driving member and the rotating shaft, so that the driving member will not drive the rotating shaft to rotate within a set rotation angle in the event of an accidental collision. The end of the rotating shaft away from the driving member abuts against the adjacent side walls of the first component and the second component to lock the first component and the second component. The present invention is simple to operate, can be locked at any position, and the locking function does not fail when the unlocking knob is accidentally touched.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical locking structures, in particular to a mechanical device. Background Art

[0002] In existing mechanical equipment, there is often such an application scenario: two rigid fittings are slidably connected to adjust the relative position relationship between the two. After the adjustment is completed, the two rigid fittings need to be locked. For example, taking the mechanical equipment as a knee extramedullary locator, it is mainly used in the tibial extramedullary positioning link in knee replacement surgery, including an ankle cradle and a bracket connected to the ankle cradle, etc., with a horizontal adjustment function. In this tibial extramedullary positioning link, since the anatomical morphology of each person's tibia is different, the extramedullary locator bracket needs to be moved left and right relative to the center position of the ankle cradle to ensure the accuracy of the tibial force line. When the bracket moves to a position aligned with the tibial force line, the bracket and the ankle cradle need to be locked.

[0003] In the above application scenarios, common locking methods on the market include threaded locking (using threaded rods), tooth locking, and traditional cam locking. These locking methods all have their corresponding shortcomings, as follows:

[0004] Thread locking: The advantage is that the structure is simple and can be locked at any position. The disadvantage is that it requires rotating 1-2 threads to complete the locking, which is inconvenient to operate.

[0005] Gear locking: The advantage is that it is easy to operate, but the disadvantage is that it cannot be locked in any position and can only be locked in the tooth meshing part;

[0006] Traditional cam locking: The advantages are simple structure and easy operation. The disadvantages are high processing precision requirements. If it is too loose, it will not lock tightly, and if it is too tight, it will be difficult to lock. At the same time, the cam is a squeeze-type lock, and it is possible to unlock it if the cam rod is accidentally touched with a little force. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a mechanical device which is easy to operate, can be locked at any position, and has a locking function that does not fail when an unlocking knob is accidentally touched.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] A mechanical device includes an anti-accidental collision locking structure, which includes a first component and a second component in a sliding connection, a rotating shaft rotatably assembled on the second component, a driving member rotatably assembled on the rotating shaft, a force transmission member for circumferentially transmitting torque is provided between the driving member and the rotating shaft, and an idle distance in the circumferential direction is provided between the force transmission member and at least one of the driving member and the rotating shaft, so that the driving member will not drive the rotating shaft to rotate within a set angle of accidental collision rotation, and an end of the rotating shaft away from the driving member abuts against the adjacent side walls of the first component and the second component to lock the first component and the second component.

[0010] Furthermore, an elastic locking member is provided between the driving member and the second component to keep the positions of the two relatively fixed without affecting the relative rotation of the two.

[0011] Furthermore, a rotation limiting structure is provided between the driving member and the second component to limit the circumferential rotation angles of both the driving member and the second component.

[0012] Furthermore, an annular limiting groove is provided on one of the driving member and the second component, and a limiting pin is fixedly provided on the other to cooperate with the annular limiting groove, and the annular limiting groove and the limiting pin form the rotation limiting structure; a threaded fitting section is provided between the rotating shaft and the second component, and the axial dimension of the annular limiting groove is greater than the axial dimension of the limiting pin;

[0013] And / or, the driving member is arranged at the tail end of the rotating shaft, which has a stepped inner hole, the inner small diameter section cooperates with the rotating shaft, and the force transmission member is arranged here, the outer large diameter section cooperates with the second component, and the rotation limiting structure is set, and the elastic locking member is set at the end of the outer large diameter section.

[0014] Furthermore, one of the driving member and the second component is provided with a C-shaped arm, and the other is provided with a circular clamping surface. The inner diameter of the C-shaped arm is larger than the outer diameter of the circular clamping surface. The inner side of the C-shaped arm is provided with protrusions for abutting the circular clamping surface at intervals. The C-shaped arm and the protrusion constitute the elastic locking member.

[0015] Furthermore, there are two protrusions, which are respectively located at the two free ends of the C-shaped arm;

[0016] And / or, the C-shaped arm is provided on the driving member, and the circular clamping surface is provided on the second component.

[0017] Furthermore, the force transmission member is fixedly connected to one of the driving member and the rotating shaft, and has an idle distance in the circumferential direction between the force transmission member and the other one.

[0018] Furthermore, the force transmission member is a latch, and the rotating shaft and the driving member are provided with corresponding sockets for inserting the latch, and the socket on the rotating shaft is an idle rotation providing hole whose size in the circumferential direction is larger than that of the latch;

[0019] Alternatively, the force transmission member is a latch, and the rotating shaft and the driving member are correspondingly provided with sockets for inserting the latch, and the socket on the driving member is an idle rotation providing hole whose size in the circumferential direction is larger than that of the latch.

[0020] Furthermore, the first component is provided with a sliding groove with a longitudinal opening, and the second component includes a sliding block inserted in the sliding groove and a sleeve connected to the back of the sliding block, the inner hole of the sleeve is used to install the rotating shaft and the inner hole passes through the sliding block.

[0021] Furthermore, the mechanical equipment is an orthopedic positioning instrument.

[0022] The present invention has the following beneficial effects:

[0023] The mechanical equipment of the present invention has an anti-accidental collision locking structure that uses a rotating shaft / locking screw for locking. It can be locked at any position and can complete the locking without rotating multiple threads, and is easy to operate. There is an idle distance in the circumferential direction between the force transmission member and at least one of the driving member and the rotating shaft, so that the driving member will not drive the rotating shaft to rotate within the set rotation angle due to accidental collision. In this way, the driving member can swing a certain amount at the tail of the rotating shaft. When the unlocking knob (i.e., the driving member) is accidentally hit, the unlocking knob can swing on the rotating shaft without driving the rotating shaft to rotate, and the locking function will not fail, thereby achieving the purpose of anti-unlocking. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the overall structure of the anti-accidental collision locking structure in the mechanical equipment of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the split structure of the anti-accidental collision locking structure shown;

[0026] Figure 3 for Figure 1 The left side elevation view of the anti-accidental-touch locking structure shown, wherein (a) corresponds to the locked state and (b) corresponds to the unlocked state;

[0027] Figure 4 for Figure 1 Schematic diagram of the structure of the locking screw;

[0028] Figure 5 for Figure 1 A schematic diagram of the structure of the end portion of the second component;

[0029] Figure 6Schematic diagrams of different mating structures between the locking screw and the driving member in the anti-accidental-collision locking structure of the present invention, wherein (a) corresponds to one mating mode, (b) corresponds to another mating mode, and (c) is a schematic top view cross-sectional structure diagram of (b);

[0030] Figure 7 for Figure 1 Schematic diagram of the structure of the end of the sleeve portion of the driving member in the anti-accidental collision locking structure shown, wherein (a) is a front view and (b) is a three-dimensional view;

[0031] Figure 8 for Figure 1 The diagram shows the matching structure of the driving member and the sleeve in the anti-accidental collision locking structure, wherein (a) is a cross-sectional view at the end of the sleeve portion of the driving member, and (b) is a cross-sectional view at the limit pin of the sleeve portion of the driving member. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0033] The present invention provides a mechanical device, including an anti-accidental collision locking structure, such as Figure 1-6 As shown, the anti-accidental-collision locking structure includes a first component 1 and a second component 2 that are slidably connected, wherein:

[0034] The second component 2 is rotatably equipped with a rotating shaft 3, 3', 3" (also known as a locking screw), and the rotating shaft 3, 3', 3" is rotatably equipped with a driving member 4, 4', 4", and a force transmission member (i.e., a latch 5, 5') for circumferentially transmitting torque is provided between the driving member 4, 4', 4" and the rotating shaft 3, 3', 3", and an idle distance in the circumferential direction is provided between the force transmission member and at least one of the driving member 4, 4', 4" and the rotating shaft 3, 3', 3", so that the driving member 4, 4', 4" will not drive the rotating shaft 3, 3', 3" to rotate within the set rotation angle when accidentally touching. In other words, the rotating shaft 3, 3', 3" and the driving member 4, 4', 4" can be connected by using a latch 5, 5' and a positioning hole 6, 6', 6", and the size of the positioning hole 6, 6', 6" is larger than the size of the latch 5, 5', so that the force transmission member (i.e., the latch 5, 5') has an idle distance in the circumferential direction;

[0035] Alternatively, in other embodiments, the rotating shaft 3, 3', 3" and the driving member 4, 4', 4" can be connected to each other by using steel balls, transmission blocks and other structures that have a clearance fit with both. In this structure, annular grooves that engage with each other are provided on the opposite surfaces of the rotating shaft and the driving member, and a bead-shaped, block-shaped or columnar transmission block is provided in the annular groove formed by the engagement of the two. When not in use, the transmission block can swing in the annular groove formed by the engagement of the two. When driven, the rotating shaft and the driving member rotate relative to each other to reduce the annular groove space between them until the transmission block is stuck between the two to form a force transmission structure, thereby realizing torque transmission.

[0036] One end of the rotating shaft 3, 3', 3" away from the driving member 4, 4', 4" abuts against the adjacent side walls of the first component 1 and the second component 2 to lock the first component 1 and the second component 2. In specific implementation, a threaded hole 23 can be provided on the side wall of the second component 2, and the rotating shaft 3, 3', 3" is provided in the threaded hole 23. The head of the rotating shaft 3, 3', 3" passes through the threaded hole 23 and abuts against the side wall of the first component 1 to lock the first component 1 and the second component 2.

[0037] During use, when in the unlocked / unlocked state, the first component and the second component are slidingly connected, and the two components can slide freely relative to each other; when the two components slide to the appropriate position and need to be locked, the rotating drive member makes the head of the rotating shaft / locking screw pass through the threaded hole on the side wall of the second component and rest against the side wall of the first component to lock the first component and the second component.

[0038] The mechanical equipment of the present invention has an anti-accidental collision locking structure that uses a rotating shaft / locking screw for locking. It can be locked at any position and can complete the locking without rotating multiple threads, and is easy to operate. There is an idle distance in the circumferential direction between the force transmission member and at least one of the driving member and the rotating shaft, so that the driving member will not drive the rotating shaft to rotate within the set rotation angle due to accidental collision. In this way, the driving member can swing a certain amount at the tail of the rotating shaft. When the unlocking knob (i.e., the driving member) is accidentally hit, the unlocking knob can swing on the rotating shaft without driving the rotating shaft to rotate, and the locking function will not fail, thereby achieving the purpose of anti-unlocking.

[0039] In the present invention, the first component 1 and the second component 2 can adopt various sliding connection methods in the art, for example:

[0040] Sliding connection method 1 (not shown)

[0041] The first component is provided with an inserting hole, and the second component is rod-shaped and inserted into the inserting hole, so that the first component and the second component form a sliding fitting relationship.

[0042] Sliding connection method 2

[0043] like Figure 1-2As shown, the first component 1 is provided with a sliding groove 11 with a longitudinal opening, and the second component 2 includes a sliding block 21 inserted into the sliding groove 11 and a sleeve 22 connected to the back of the sliding block 21. The inner hole of the sleeve 22 (i.e., the threaded hole 23) is used to install the rotating shaft 3, 3', 3" and the inner hole passes through the sliding block 21. Scales 12 can be provided on both sides of the longitudinal opening of the first component 1 to accurately adjust the relative positions of the two components.

[0044] The locking principle is as follows:

[0045] The sliding block 21 slides into the first component 1 through the sliding groove 11. At this time, the sliding block 21 can slide left and right in the first component 1. The rotating shaft / locking screw 3 is inserted into it from the tail end of the sleeve 22, and is connected with the sleeve 22 (the sleeve 22 can only have threads at the front end) on the second component 2 through the front end thread of the rotating shaft 3 (the rotating shaft 3 can be provided with threads only in a part such as the front end, or can be provided with threads throughout the body). At the same time, the rotating shaft 3 continues to be screwed in until the front end face of the rotating shaft 3 rests against the sliding groove wall of the first component 1. At this time, the locking mechanism locks the first component 1 and the second component 2 through the rotating shaft 3.

[0046] In the present invention, the force transmission member (i.e., the latch 5, 5') can be fixedly connected to one of the driving member 4, 4', 4" and the rotating shaft 3, 3', 3", with an idle distance in the circumferential direction between the other. The rotating shaft 3, 3', 3" and the driving member 4, 4', 4" are connected by the force transmission member (i.e., the latch 5, 5') and the positioning hole. In specific implementation, under the above-mentioned sliding connection method 2, the following structural forms can be adopted:

[0047] Structural form 1

[0048] like Figure 1-2 As shown, the driving member 4 is a knob and has a sleeve portion 41 for accommodating the rear end of the rotating shaft 3. A latch 5 (i.e., a long pin in the figure) is fixedly mounted on the sleeve portion 41. A positioning hole 6 is provided at the rear end of the rotating shaft 3. The latch 5 on the sleeve portion 41 passes through the positioning hole 6 at the rear end of the rotating shaft 3, thereby connecting the driving member 4 to the rotating shaft 3. In this case, the diameter of the positioning hole 6 can be 1.2-4 times (e.g., 2 times, 3 times, etc.) the diameter of the latch 5, or the positioning hole 6 can be a fan-shaped hole. That is, the force transmission member is the latch 5, and the rotating shaft 3 and the driving member 4 are correspondingly provided with a socket for the latch 5 to be inserted. The socket on the rotating shaft 3 (i.e., the positioning hole 6) is an idler hole whose circumferential size is larger than the size of the latch 5.

[0049] Figure 3This is a left elevation view of the anti-accidental-collision locking mechanism in this configuration, with (a) corresponding to the locked state and (b) to the unlocked state. Locking is achieved by rotating the knob clockwise to any angle between 45° and 180° (with respect to the vertical plane). Unlocking is achieved by rotating the knob counterclockwise to the corresponding locking angle. This allows for quick locking and unlocking of the entire workpiece with a single rotation, avoiding the inconvenience of having to screw in one or two turns of the thread.

[0050] The structure is as follows:

[0051] The hole at the rear end of the rotating shaft 3 is a positioning hole 6 (i.e., an anti-unlocking hole). The diameter of the positioning hole 6 is between 1.2 and 4 times the diameter of the latch 5. After the driver 4 is connected to the rotating shaft 3 via the latch 5, the latch 5 passes through the positioning hole 6. Due to the certain gap between the latch 5 and the positioning hole 6, the driver 4 can swing a certain amount at the rear end of the rotating shaft 3. After the rotating driver 4 locks the second component 2 with the first component 1, if the doctor accidentally touches the driver 4, because it can swing on the rotating shaft 3, it will not cause the rotating shaft 3 to rotate, thus achieving the purpose of anti-unlocking.

[0052] Structural form 2

[0053] like Figure 6 As shown in (a), the driving member 4' is a knob, and the driving member 4' has a sleeve portion 41' for accommodating the tail of the rotating shaft 3', a latch 5' is fixedly provided at the tail of the rotating shaft 3', and a positioning hole 6' is provided on the sleeve portion 41'. The second structural form is basically the same as the first structural form, except that the positions of the latch and the positioning hole are interchanged. Similarly, the diameter of the positioning hole 6' can be 1.2-4 times the diameter of the latch 5', or the positioning hole 6' is a fan-shaped hole. That is, the force transmission member is the latch 5', and corresponding sockets for the latch to be inserted are provided on the rotating shaft 3' and the driving member 4', and the socket on the driving member 4' (i.e., the positioning hole 6') is an idle rotation providing hole whose size in the circumferential direction is larger than that of the latch 3'.

[0054] Structural form three

[0055] like Figure 6 As shown in (b), the driving member 4" is a driving rod, which also serves as a latch, and a positioning hole 6" is provided at the tail of the rotating shaft 3".

[0056] In this structural form, the driving rod 4" passes through the positioning hole 6" at the tail of the rotating shaft 3". The length of the driving rod 4" is greater than the depth of the positioning hole 6" and extends to the outside of the two sides of the positioning hole 6". When in use, the two sides of the driving rod 4" can be used as driving handles. Rotating the driving handles can realize locking / unlocking of the locking structure. Similarly, the diameter of the positioning hole 6" can be 1.2-4 times the diameter of the driving rod, or the positioning hole 6" can be a fan-shaped hole, such as Figure 6 As shown in (c).

[0057] In the above three structural forms, there is a certain gap between the positioning hole and the pin, so that the knob can swing a certain amount at the end of the shaft. When the knob is rotated to lock the first component and the second component, if the knob is accidentally touched, the knob can swing on the shaft and will not drive the shaft to rotate, thereby achieving the purpose of preventing unlocking.

[0058] In the aforementioned configurations 1 and 2, an elastic locking member can be provided between the driver 4, 4' and the second assembly 2 to maintain their relative fixed position without affecting their relative rotation. The elastic locking member can be provided independently of the driver and the second assembly, externally mounted on either assembly, or fixedly mounted on one of them. Furthermore, a rotation limiting structure can be provided between the driver 4, 4' and the second assembly 2 to limit the circumferential rotation angle of the driver 4, 4' and the second assembly 2.

[0059] For ease of implementation, the rotation limiting structure preferably adopts the following structural form:

[0060] like Figure 2 and Figure 5 As shown, an annular limiting groove 221 is provided on one of the driving member 4 and the second component 2 (the embodiment shown in the figure is provided on the second component 2), and a limiting pin 7 (i.e., a short pin in the figure) that cooperates with the annular limiting groove 221 is fixedly provided on the other (the embodiment shown in the figure is provided on the driving member 4). The annular limiting groove 221 and the limiting pin 7 form the rotation limiting structure;

[0061] There is a threaded mating section between the rotating shaft 3 and the second component 2, that is, the front end of the rotating shaft 3 has an external thread (the rotating shaft 3 can be provided with an external thread only at a part such as the front end, or can be provided with an external thread throughout the entire body), and the sleeve 22 of the second component 2 can be provided with an internal thread only at the front end or be provided with an internal thread throughout the entire body;

[0062] The axial dimension of the annular limiting groove 221 is larger than the axial dimension of the limiting pin 7. Since the rotating shaft 3 will move axially when rotating in the sleeve 22, the axial dimension of the annular limiting groove 221 needs to be larger than the axial dimension of the limiting pin 7 to avoid hindering the rotating shaft 3 from rotating in the sleeve 22.

[0063] In this way, the movement of the limit pin 7 in the annular limit groove 221 can effectively limit the locking angle of the driving member 4, and thus prevent the driving member 4 from excessively rotating and damaging the relatively thin force transmission member / latch 5, thereby greatly improving the service life of the force transmission member / latch 5 and the entire device. Obviously, the inner end of the limit pin 7 does not contact the rotating shaft / locking screw 3 (see Figure 8In (b), there is a certain gap between the two to avoid interfering with the normal operation of the rotating shaft / locking screw 3.

[0064] It is conceivable that the positions of the limit pin 7 and the annular limit groove 221 can also be interchanged, that is, an annular limit groove can be provided on the sleeve portion of the driving member, and the end of the sleeve is located in the sleeve portion of the driving member and is fixed with a limit pin that cooperates with the annular limit groove.

[0065] At the same time, for ease of implementation, the elastic locking member preferably adopts the following structural form:

[0066] like Figure 7-8 As shown, the driving member 4 is arranged at the tail end of the rotating shaft 3, which has a stepped inner hole, the inner small diameter section 46 cooperates with the rotating shaft 3, and the force transmission member (i.e., the latch 5) is arranged here, the outer large diameter section 48 cooperates with the second component 2, and the rotation limiting structure is arranged, and the elastic locking member is arranged at the end of the outer large diameter section 48.

[0067] Furthermore, a C-shaped arm 42 is provided on one of the driving member 4 and the second component 2 (the embodiment shown in the figure is on the end of the sleeve portion of the driving member 4), and a circular clamping surface 220 is provided on the other (the embodiment shown in the figure is on the end of the second component 2). The inner diameter of the C-shaped arm 42 is larger than the outer diameter of the circular clamping surface 220 (see Figure 8 In (a), protrusions 43 are spaced apart on the inner side of the C-shaped arm 42 to abut the circular clamping surface 220. The C-shaped arm 42 and the protrusions 43 constitute the elastic locking element. Because the C-shaped arm 42 has relatively low rigidity, the protrusions 43 at its inner end abut the circular clamping surface 220 of the sleeve 22, generating a certain damping force on the sleeve 22, thereby effectively preventing accidental contact with the locking structure. In the illustrated embodiment, there are two protrusions 43, one located at each free end of the C-shaped arm 42.

[0068] The mechanical device of the present invention may be an orthopedic positioning device, such as a knee joint extramedullary locator and other various devices.

[0069] The above is 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 principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A mechanical device, characterized in that: The invention comprises an anti-accidental collision locking structure, wherein the anti-accidental collision locking structure comprises a first component and a second component that are slidably connected, a rotating shaft is rotatably mounted on the second component, a driving member is rotatably mounted on the rotating shaft, a force transmission member for circumferentially transmitting torque is provided between the driving member and the rotating shaft, an idle rotation distance in the circumferential direction is provided between the force transmission member and at least one of the driving member and the rotating shaft, so that the driving member will not drive the rotating shaft to rotate within a set rotation angle in the event of an accidental collision, and an end of the rotating shaft away from the driving member abuts against adjacent side walls of the first component and the second component to lock the first component and the second component; The mechanical device is an orthopedic positioning instrument; the force transmission member is fixedly connected to one of the driving member and the rotating shaft, and has an idle distance in the circumferential direction between the force transmission member and the other; the force transmission member is a latch, and the rotating shaft and the driving member are correspondingly provided with sockets for inserting the latch; The insertion hole on the rotating shaft is an idle rotation providing hole whose size in the circumferential direction is larger than that of the latch, or the insertion hole on the driving member is an idle rotation providing hole whose size in the circumferential direction is larger than that of the latch.

2. The mechanical device according to claim 1, characterized in that: An elastic locking member is provided between the driving member and the second component to keep the positions of the two relatively fixed without affecting the relative rotation of the two.

3. The mechanical device according to claim 2, characterized in that: A rotation limiting structure for limiting the circumferential rotation angles of the driving member and the second component is provided between the driving member and the second component.

4. The mechanical device according to claim 3, characterized in that: An annular limiting groove is provided on one of the driving member and the second component, and a limiting pin that cooperates with the annular limiting groove is fixed on the other, and the annular limiting groove and the limiting pin form the rotation limiting structure; a threaded fitting section is provided between the rotating shaft and the second component, and the axial dimension of the annular limiting groove is greater than the axial dimension of the limiting pin; And / or, the driving member is arranged at the tail end of the rotating shaft, which has a stepped inner hole, the inner small diameter section cooperates with the rotating shaft, and the force transmission member is arranged here, the outer large diameter section cooperates with the second component, and the rotation limiting structure is set, and the elastic locking member is set at the end of the outer large diameter section.

5. The mechanical device according to claim 2, characterized in that: One of the driving member and the second component is provided with a C-shaped arm, and the other is provided with a circular clamping surface. The inner diameter of the C-shaped arm is larger than the outer diameter of the circular clamping surface. The inner side of the C-shaped arm is provided with protrusions for abutting the circular clamping surface at intervals. The C-shaped arm and the protrusion constitute the elastic locking member.

6. The mechanical device according to claim 5, characterized in that: There are two protrusions, which are respectively located at the two free ends of the C-shaped arm; And / or, the C-shaped arm is provided on the driving member, and the circular clamping surface is provided on the second component.

7. The mechanical device according to claim 1, characterized in that: The first component is provided with a sliding groove with a longitudinal opening, and the second component includes a sliding block inserted in the sliding groove and a sleeve connected to the back of the sliding block. The inner hole of the sleeve is used to install the rotating shaft and the inner hole passes through the sliding block.

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