A surgical positioning device for orthopedics

Abstract

The application provides a surgical positioning device for orthopedics, and relates to the field of orthopedic surgical devices, characterized in that the device comprises a base, two groups of three-way adjusting structures and clamping structures, the three-way adjusting structure is provided with an X-axis adjusting seat, a Y-axis adjusting seat and a scissors frame, cooperates with a screw rod A and a sliding seat, and realizes accurate adjustment of the mounting plate in the X, Y and Z three-axis directions; in the clamping structure, the inner sides of the two groups of clamping plates are respectively provided with left-handed and right-handed thread grooves, the screw rod B is provided with two sections of threads with opposite rotation directions, synchronous centering clamping is realized through the driving of a clamping motor, the clamping seat is matched with a circular guide rail through a driving seat, and can rotate by ±60° around an axis; the mounting plate is internally provided with a bidirectional screw rod, cooperates with a reverse thread on the moving seat, and realizes overall centering movement of the two groups of clamping structures; and the base is further provided with a projection assembly for auxiliary positioning. The application has the advantages that it can be accurately adjusted in multiple dimensions, clamping is stable and centered, the angle is flexibly adjustable, and the precision and efficiency of orthopedic surgical positioning are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of orthopedic surgical devices, and particularly to an orthopedic surgical positioning device. Background Technology

[0002] In orthopedic surgery, precise preoperative positioning and stable intraoperative bone fixation are crucial for ensuring surgical outcomes. Traditional orthopedic surgical positioning devices often employ manual adjustment or simple mechanical clamping structures, which have the following shortcomings:

[0003] Most positioning devices can only achieve single-direction or two-axis adjustment, which is difficult to meet the needs of complex surgeries for precise positioning in multiple angles and dimensions of space. Especially when reducing and fixing fracture ends or deformed bones, the adjustment flexibility is poor. Common clamping mechanisms usually adopt a unilateral movement or independent drive method, resulting in uneven distribution of clamping force and the inability to achieve synchronous centering movement of the two clamping plates. This can easily cause the bone to shift or rotate during clamping, affecting the accuracy of the surgery. During the correction process, multiple sets of structures will shift during movement, making the final correction unable to proceed along the bone axis, thus affecting the overall correction and recovery effect.

[0004] Therefore, there is an urgent need for an orthopedic surgical positioning device that can achieve precise multi-axial adjustment and synchronous clamping along the bone axis to solve the above problems. Summary of the Invention

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0006] A surgical positioning device for orthopedics includes a base, a three-way adjustment structure and a clamping structure. The base is in the shape of a cuboid and has symmetrical mounting grooves at its upper end.

[0007] The three-way adjustment structure consists of two sets, including an X-axis adjustment seat, a Y-axis adjustment seat, and a scissor lift. The inner sides of the X-axis adjustment seat and the Y-axis adjustment seat are equipped with screw A and sliding seats, and are respectively connected to a base plate and the X-axis adjustment seat. The upper end of the base plate is connected to a mounting plate. The scissor lift is fixedly connected to the mounting groove of the base. The three-way adjustment structure is used to adjust the position of the mounting plate in three axial directions.

[0008] The clamping structures are fixed to the upper surface of the mounting plate along the axial direction of the mounting plate in pairs. Each clamping structure includes a clamping seat, a clamping plate, and a mounting base. The clamping seat has an internal mounting cavity, and a screw B is rotatably connected to the inner side of the mounting cavity. A clamping motor is connected to one side of the screw B through a transmission gear. The circular guide rail is vertically fixed above the mounting base. The drive seat is fixed to one side of the clamping seat and has a positioning wheel and a drive wheel that roll in cooperation with the circular guide rail, allowing the clamping seat to rotate around the axis of the circular guide rail. The lower end of the mounting base is connected to the mounting plate. There are two sets of clamping plates, each with an arc groove on its inner side and arranged vertically opposite each other. One end of each set of clamping plates has a left-handed and a right-handed thread groove, respectively. The screw B has two sections of threads with opposite directions, which cooperate with the left-handed and right-handed thread grooves of the two sets of clamping plates, respectively. This allows the two sets of clamping plates to move synchronously towards the center or in opposite directions when the screw B rotates, thus achieving clamping by moving synchronously towards the central position.

[0009] As an improvement, the base has a control button on one side for controlling various electrical components. The control button also has a line interface on one side for connecting power lines. A bracket is fixed to the upper end of the base. The bracket is located between two sets of mounting plates and is offset to one side of the mounting plate axis. A projection component is fixed to the upper end of the bracket. The projection component is positioned directly opposite the mounting plate and is used to project and position the skeleton, facilitating device position adjustment.

[0010] As an improvement, guide rods A are symmetrically provided on both sides of the screw A. The outer side of the Y-axis adjustment seat of the three-way adjustment structure is marked with a scale to help determine the moving position of the X-axis adjustment seat. The lower end of the Y-axis adjustment seat is equipped with two sets of scissor bracket structures. One end of the scissor bracket is rotatably connected to the Y-axis adjustment seat through a rotating pin, and the other end is equipped with a sliding pin that cooperates with a sliding groove to achieve a sliding connection.

[0011] As an improvement, the lower end of the scissor lift is equipped with an electric push rod, and one end of the scissor lift has a slider. The slider is located below the slide groove of the Y-axis adjustment seat and is slidably connected with the slide rail structure of the base to cooperate with the lifting of the scissor lift. The push rod part of the electric push rod is connected to the slider of the scissor lift through a connecting rod to synchronously control the lifting height of the scissor lift.

[0012] As an improvement, in the clamping structure, the circular guide rail is vertically fixed above the mounting base and arranged along the axial direction of the mounting plate. The drive base is fixed to the side of the clamping base away from the clamping plate. The drive base includes a set of positioning wheels and two sets of drive wheels. The positioning wheels are located inside the circular guide rail, and the drive wheels are located in the groove on the outer side of the circular guide rail. They are used to cooperate with the positioning wheels to clamp the circular guide rail and cooperate with the internal motor to realize the ±° rotation of the clamping base and the clamping plate around the circular guide rail.

[0013] As an improvement, the mounting plate has a connection hole near the base plate, and a rotating seat A is fixed at the middle of the upper end of the base plate. The rotating seat A is an electric rotary table or has a built-in rotary motor, and its output end is connected to the connection hole of the mounting plate for driving the mounting plate to rotate around the vertical axis.

[0014] As an improvement, a position adjustment motor is fixed to one end of the mounting plate along the axis of the base. The inner side of the mounting plate has a mounting groove, and the inner side of the mounting groove has a lead screw. The lead screw is a two-way lead screw with two sections of threads with opposite directions, which respectively mate with the left-hand threaded holes and right-hand threaded holes of the two sets of movable seats. The lower end of the mounting base of the clamping structure is fixed with a movable seat, which is connected to the lead screw. The lead screw is connected to the main shaft of the position adjustment motor. The upper end of the mounting plate has a slide rail, which is slidably connected to the slide groove at the lower end of the mounting base. The inner threads of the two sets of movable seats are left-hand threaded holes and right-hand threaded holes, respectively, which are used to cooperate with the position adjustment motor to drive inward movement.

[0015] As an improvement, the inner side of the movable seat has a mounting groove, and the inner side of the mounting groove has a rotating seat B. The rotating seat B is an electric rotary table or a damped rotating shaft. Its lower end is rotatably connected to the movable seat, and its upper end is fixedly connected to the mounting seat. It is equipped with a locking screw or a built-in brake to adjust and lock the horizontal angle of the mounting seat relative to the mounting plate.

[0016] As an improvement, the shaft of the clamping motor is set perpendicular to the axis of the screw B and is connected to the screw B through a right-angle gear set. A guide rod B is provided on the side of the screw B away from the clamping plate. One side of the clamping plate has a through hole that slides with the guide rod B to limit the vertical movement and offset of the clamping plate.

[0017] The beneficial effects of this invention are as follows: by setting two sets of three-way adjustment structures, each set includes an X-axis adjustment seat, a Y-axis adjustment seat and a scissor lift, and with screw A and sliding seat, the mounting plate can be independently and precisely adjusted in the X, Y and Z axial directions. The scissor lift, in conjunction with the electric push rod, achieves smooth lifting and lowering. The adjustment process is stable and controllable, meeting the spatial positioning requirements of complex skeletal morphology.

[0018] By setting up a clamping structure, clamping and positioning can be carried out simultaneously, ensuring that the correction position is in the center and avoiding displacement. Combined with the arc groove structure, the contact area with the bone can be further increased, improving the overall clamping stability.

[0019] By setting up a circular guide rail and drive seat structure, rotational adjustment can be made in the axial position, which can improve the fixation and fitting effect, and can also be used for axial fracture treatment, thus improving the overall flexibility of use.

[0020] By setting up projection components, positioning planning can be carried out before surgery, making it easier for medical staff to quickly determine the treatment location and subsequent adjustment direction, reducing repeated trial and error processes, and improving overall positioning efficiency. Attached Figure Description

[0021] Figure 1 This is a front view of an orthopedic surgical positioning device according to the present invention;

[0022] Figure 2 This is a front sectional view of the three-way adjustment structure of an orthopedic surgical positioning device according to the present invention;

[0023] Figure 3 This is a left sectional view of the clamping structure of an orthopedic surgical positioning device according to the present invention.

[0024] In the diagram: 1. Base; 2. Three-way adjustment structure; 3. Mounting plate; 4. Clamping structure; 5. Bracket; 6. Projection assembly;

[0025] 201. X-axis adjusting seat; 202. Sliding seat; 203. Y-axis adjusting seat; 204. Scissor lifter; 205. Electric actuator; 206. Screw A; 207. Guide rod A;

[0026] 301. Position adjustment motor; 302. Base plate; 303. Rotary seat A;

[0027] 401. Clamping seat; 402. Clamping plate; 403. Mounting seat; 404. Rotary seat B; 405. Moving seat; 406. Screw B; 407. Guide rod B; 408. Clamping motor; 409. Drive seat; 410. Circular guide rail. Detailed Implementation

[0028] To make the content of this invention easier to understand, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0029] like Figure 1As shown, an orthopedic surgical positioning device includes a base 1, a three-way adjustment structure 2, and a clamping structure 4. The base 1 is rectangular in shape, with symmetrical mounting grooves on its upper end. The three-way adjustment structure 2 consists of two sets, including an X-axis adjustment seat 201, a Y-axis adjustment seat 203, and a scissor bracket 204. The inner sides of the X-axis adjustment seat 201 and the Y-axis adjustment seat 203 are equipped with screws A206 and sliding seats 202, and are respectively connected to a base plate 302 and the X-axis adjustment seat 201. The upper end of the base plate 302 is connected to a mounting plate 3. The scissor bracket 204 is fixedly connected to the mounting grooves of the base 1. The three-way adjustment structure 2 is used to adjust the position of the mounting plate 3 in three axial directions. The clamping structure 4 is fixed to the upper surface of the mounting plate 3 in pairs along the axial direction of the mounting plate 3. The clamping structure 4 includes a clamping seat 401, a clamping plate 402, and a mounting seat 403. The clamping seat 401 has an internal mounting cavity. A screw B406 is rotatably connected to the inner side of the cavity. A clamping motor 408 is connected to one side of the screw B406 via a transmission gear. The circular guide rail 410 is vertically fixed above the mounting base 403. A drive seat 409 is fixed to one side of the clamping base 401. The drive seat 409 is equipped with a positioning wheel and a drive wheel, which roll in cooperation with the circular guide rail 410, allowing the clamping base 401 to rotate around the axis of the circular guide rail 410. The lower end of the mounting base 403 is connected to the mounting plate. 3. Connection: There are two sets of clamping plates 402, each with an arc groove on its inner side and arranged opposite each other. One end of each set of clamping plates 402 has a left-handed and a right-handed threaded groove, respectively. The screw B406 has two sections of threads with opposite directions, which respectively engage with the left-handed and right-handed threaded grooves of the two sets of clamping plates 402. This allows the two sets of clamping plates 402 to move synchronously towards the center or in opposite directions when the screw B406 rotates, thus achieving clamping by moving synchronously towards the central position. The lower end of the base 1 has a foot, which can be fitted with a suction cup structure or a bolt fixing structure for connection with the table surface and to improve overall strength.

[0030] like Figure 2As shown, the base 1 has a control button on one side for controlling various electrical components. The control button also has a wiring interface on one side for connecting power lines. A bracket 5 is fixed to the upper end of the base 1, located between two sets of mounting plates 3 and offset to one side of the mounting plate 3's axis. A projection component 6 is fixed to the upper end of the bracket 5, facing the mounting plate 3, for projecting and positioning the skeleton, facilitating device position adjustment. Guide rods A207 are symmetrically arranged on both sides of the screw A206. The outer side of the Y-axis adjustment seat 203 of the three-way adjustment structure 2 has a scale to assist in determining the movement position of the X-axis adjustment seat 201. The lower end of the Y-axis adjustment seat 203 has two sets of scissor brackets 204, one end of which is rotatably connected to the Y-axis adjustment seat 203 via a rotating pin, and the other end has a sliding pin that engages with a sliding groove for sliding connection. The lower end of the scissor lift 204 is equipped with an electric push rod 205. One end of the scissor lift 204 has a slider, which is located below the slide groove of the Y-axis adjusting seat 203 and is slidably connected to the slide rail structure of the base 1. This slider is used to coordinate with the lifting of the scissor lift 204. The push rod portion of the electric push rod 205 is connected to the slider of the scissor lift 204 via a connecting rod, which is used to synchronously control the lifting height of the scissor lift 204. The inner side of the electric push rod 205 is equipped with an extension sensor, which is used to identify the extension or retraction length of the push rod portion, and to assist in judging the overall lifting and lowering height of the scissor lift 204, facilitating unified control and adjustment.

[0031] In the clamping structure 4, the circular guide rail 410 is vertically fixed above the mounting base 403 and is arranged along the axial direction of the mounting plate 3. The drive base 409 is fixed to the side of the clamping base 401 away from the clamping plate 402. The drive base 409 includes a set of positioning wheels and two sets of drive wheels. The positioning wheels are located inside the circular guide rail 410, and the drive wheels are located in the grooves on the outer side of the circular guide rail 410. They are used to cooperate with the positioning wheels to clamp the circular guide rail 410 and cooperate with the internal motor to achieve ±60° rotation of the clamping base 401 and the clamping plate 402 around the circular guide rail 410. The center position of the clamping plate 402 coincides with the central axis of the circular guide rail 410. When the drive base 409 is running, it can drive the clamping position to rotate and adjust accordingly.

[0032] like Figure 1 and Figure 3As shown, the mounting plate 3 has a connection hole near the base plate 302. A rotating seat A303 is fixed at the middle of the upper end of the base plate 302. The rotating seat A303 is an electric rotary table or has a built-in rotary motor. Its output end is connected to the connection hole of the mounting plate 3 for driving the mounting plate 3 to rotate around the vertical axis. A position adjustment motor 301 is fixed to one end of the mounting plate 3 along the axis of the base 1. The inner side of the mounting plate 3 has a mounting groove, and the inner side of the mounting groove has a lead screw. The lead screw is a two-way lead screw with two sections of threads with opposite directions, which respectively cooperate with the left-hand threaded holes and right-hand threaded holes of the two sets of moving seats 405. The lower end of the mounting seat 403 of the clamping structure 4 is fixed with a moving seat 405. The moving seat 405 is connected to the lead screw, and the lead screw is connected to the main shaft of the position adjustment motor 301. The upper end of the mounting plate 3 has a slide rail, which is slidably connected to the slide groove at the lower end of the mounting seat 403. The inner threads of the two sets of moving seats 405 are left-hand threaded holes and right-hand threaded holes, respectively, which are used to cooperate with the position adjustment motor 301 to drive inward movement. The inner side of the movable seat 405 has a mounting groove, and the inner side of the mounting groove has a rotating seat B404. The rotating seat B404 is an electric rotary table or a damped rotating shaft. Its lower end is rotatably connected to the movable seat 405, and its upper end is fixedly connected to the mounting seat 403. It is equipped with a locking screw or a built-in brake to adjust and lock the horizontal angle of the mounting seat 403 relative to the mounting plate 3. The rotating shaft of the clamping motor 408 is set perpendicular to the axis of the screw B406 and is connected to the screw B406 through a right-angle gear set. The side of the screw B406 away from the clamping plate 402 is provided with a guide rod B407. One side of the clamping plate 402 has a through hole that slides with the guide rod B407 to limit the vertical movement and offset of the clamping plate 402. The clamping motor 408 has a rotation sensor at one end. The rotation sensor is used to identify the number of rotations of the screw B406 and to determine the position of the clamping plate 402. The clamping motor 408 also includes a locking structure for locking the shaft and restricting the rotation of the screw B406, thereby achieving a more efficient clamping and positioning effect.

[0033] When in use, the operator fixes the base 1 to the tabletop, connects the corresponding power and control lines, and starts the device for reset and self-test adjustment after power-on. When a patient needs to use it, the film data needs to be uploaded first, and the corresponding treatment plan is projected onto the upper end of the mounting plate 3 through the projection component 6, facing the clamping structure 4. At this time, the patient places the corresponding treatment position inside the clamping structure 4, and the operator adjusts the angle and position of the three-way adjustment structure 2 and the clamping structure 4 one by one to ensure that the clamping plate 402 is close to the corresponding torso position.

[0034] During clamping and fixation, the operator controls the drive seat 409 to move it to the corresponding operating angle. The clamping motor 408 operates to reduce the distance between the clamping plates 402, ensuring stable clamping of the corresponding torso. At this time, medical personnel can install fixation pins through the slots on the inner side of the clamping plates 402, connecting them to the bones to further enhance the connection strength with the torso and facilitate medical treatment operations. During this process, medical personnel can axially rotate the torso using the drive seat 409, facilitating direct adjustment of posture and multi-angle observation and treatment operations, further improving the ease of use of the equipment.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A surgical positioning device for orthopedics, characterized in that, It includes a base (1), a three-way adjustment structure (2) and a clamping structure (4). The base (1) is in the shape of a cuboid and has symmetrical mounting grooves at its upper end. The three-way adjustment structure (2) has two sets, including an X-axis adjustment seat (201), a Y-axis adjustment seat (203) and a scissor lift (204). The inner sides of the X-axis adjustment seat (201) and the Y-axis adjustment seat (203) are equipped with a screw A (206) and a sliding seat (202), and are respectively connected to a base plate (302) and the X-axis adjustment seat (201). The upper end of the base plate (302) is connected to a mounting plate (3). The scissor lift (204) is fixedly connected to the mounting groove of the base (1). The three-way adjustment structure (2) is used to adjust the position of the mounting plate (3) in three axial directions. The clamping structures (4) are fixed to the upper surface of the mounting plate (3) in pairs along the axial direction of the mounting plate (3). The clamping structure (4) includes a clamping seat (401), a clamping plate (402), and a mounting seat (403). The clamping seat (401) has a mounting cavity inside. A screw B (406) is rotatably connected to the inner side of the mounting cavity. A clamping motor (408) is connected to one side of the screw B (406) through a transmission gear. The circular guide rail (410) is vertically fixed above the mounting seat (403). The drive seat (409) is fixed to one side of the clamping seat (401). The drive seat (409) is provided with a positioning wheel and a drive wheel, which are connected to the circular guide rail (410). The guide rail (410) is rolled to allow the clamping seat (401) to rotate around the axis of the circular guide rail (410). The lower end of the mounting seat (403) is connected to the mounting plate (3). There are two sets of clamping plates (402), each with an arc groove on its inner side and arranged opposite each other. The inner side of one end of each set of clamping plates (402) has a left-handed and a right-handed thread groove, respectively. The screw B (406) has two sections of threads with opposite directions, which respectively cooperate with the left-handed and right-handed thread grooves of the two sets of clamping plates (402), so that when the screw B (406) rotates, the two sets of clamping plates (402) move synchronously to the middle or in opposite directions, which is used to move synchronously to the central position to achieve clamping.

2. The orthopedic surgical positioning device according to claim 1, characterized in that, The base (1) has a control button on one side for controlling various electrical structures. The control button has a line interface on one side for connecting power lines. The upper end of the base (1) is fixed with a bracket (5). The bracket (5) is located between two sets of mounting plates (3) and is offset to one side of the axis of the mounting plate (3). The upper end of the bracket (5) is fixed with a projection component (6). The projection component (6) is set facing the mounting plate (3) for projecting and positioning the bone position, which facilitates the adjustment of the device position.

3. The orthopedic surgical positioning device according to claim 1, characterized in that, The screw A (206) is symmetrically provided with guide rods A (207) on both sides. The outer side of the Y-axis adjustment seat (203) of the three-way adjustment structure (2) is marked with a scale to help determine the moving position of the X-axis adjustment seat (201). The lower end of the Y-axis adjustment seat (203) is provided with two sets of scissor brackets (204) structure. One end of the scissor bracket is rotatably connected to the Y-axis adjustment seat (203) through a rotating pin, and the other end is provided with a sliding pin to cooperate with the sliding groove to achieve a sliding connection.

4. The orthopedic surgical positioning device according to claim 3, characterized in that, The lower end of the scissor lift (204) is provided with an electric push rod (205). One end of the scissor lift (204) is equipped with a slider. The slider is located below the slide groove of the Y-axis adjustment seat (203) and is slidably connected with the slide rail structure of the base (1) to cooperate with the lifting of the scissor lift (204). The push rod part of the electric push rod (205) is connected to the slider of the scissor lift (204) through a connecting rod to synchronously control the lifting height of the scissor lift (204).

5. The orthopedic surgical positioning device according to claim 1, characterized in that, In the clamping structure (4), the circular guide rail (410) is vertically fixed above the mounting base (403) and is set along the axial direction of the mounting plate (3). The drive base (409) is fixed on the side of the clamping base (401) away from the clamping plate (402). The drive base (409) includes a set of positioning wheels and two sets of drive wheels. The positioning wheels are located inside the circular guide rail (410), and the drive wheels are located in the groove on the outside of the circular guide rail (410). They are used to cooperate with the positioning wheels to clamp the circular guide rail (410) and cooperate with the internal motor to realize the ±60° rotation of the clamping base (401) and the clamping plate (402) around the circular guide rail (410).

6. The orthopedic surgical positioning device according to claim 1, characterized in that, The mounting plate (3) has a connection hole near the base plate (302). A rotating seat A (303) is fixed at the middle of the upper end of the base plate (302). The rotating seat A (303) is an electric rotating table or has a built-in rotating motor. Its output end is connected to the connection hole of the mounting plate (3) for driving the mounting plate (3) to rotate around the vertical axis.

7. The orthopedic surgical positioning device according to claim 6, characterized in that, The mounting plate (3) is fixed with a position adjustment motor (301) at one end along the axis of the base (1). The mounting plate (3) has a mounting groove on its inner side, and a lead screw on the inner side of the mounting groove. The lead screw is a two-way lead screw with two threads of opposite directions, which respectively cooperate with the left-hand threaded holes and right-hand threaded holes of the two sets of moving seats (405). The lower end of the mounting seat (403) of the clamping structure (4) is fixed with a moving seat (405). The moving seat (405) is connected to the lead screw. The lead screw is connected to the main shaft of the position adjustment motor (301). The upper end of the mounting plate (3) has a slide rail. The slide rail is slidably connected to the slide groove at the lower end of the mounting seat (403). The inner threads of the two sets of moving seats (405) are left-hand threaded holes and right-hand threaded holes, which are used to cooperate with the position adjustment motor (301) to drive inward movement.

8. The orthopedic surgical positioning device according to claim 7, characterized in that, The inner side of the movable seat (405) has a mounting groove, and the inner side of the mounting groove has a rotating seat B (404). The rotating seat B (404) is an electric rotary table or a damped rotating shaft. Its lower end is rotatably connected to the movable seat (405), and its upper end is fixedly connected to the mounting seat (403). It is provided with locking screws or built-in brakes to adjust and lock the horizontal angle of the mounting seat (403) relative to the mounting plate (3).

9. A surgical positioning device for orthopedics according to claim 8, characterized in that, The rotating shaft of the clamping motor (408) is set perpendicular to the axis of the screw B (406) and is connected to the screw B (406) through a right-angle gear set. The screw B (406) is provided with a guide rod B (407) on the side away from the clamping plate (402). The clamping plate (402) has a through hole on one side that slides with the guide rod B (407) to limit the vertical movement and offset of the clamping plate (402).

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