Workbench for machining valve

Abstract

The utility model relates to a workbench for machining a valve. Comprising a rack, a lifting driving device is installed on the rack, a rotation driving device is installed at the lifting end of the lifting driving device, and a distance adjusting device is installed on the rotation driving device and used for adjusting the distance between the first positioning device and the second positioning device; the first positioning device comprises a first positioning seat, a first turnover shaft is rotationally connected to the first positioning seat, a turnover mounting seat is fixedly connected to the inner end of the first turnover shaft, a plurality of damping and buffering assemblies and positioning clamping blocks are mounted on the turnover mounting seat, and a turnover positioning assembly is mounted between the outer end of the first turnover shaft and the first positioning seat. According to the utility model, the rotary adjustment of a workpiece in a plane and the turnover adjustment of the workpiece around a transverse shaft can be realized, and the height of the workbench can be adjusted, so that the workbench is convenient for workers with different heights to use.

Description

Technical Field

[0001] This utility model belongs to the field of valve processing technology, and in particular relates to a workbench for processing valves. Background Technology

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and regulate and control the parameters of the transported medium. Based on their function, they can be divided into shut-off valves, check valves, and regulating valves, etc. Valves used in fluid control systems have various structures and functions, ranging from the simplest shut-off valves to the various valves used in extremely complex automatic control systems; their types and specifications are quite numerous. The valve body is the main component of the valve, and the other parts of the valve are installed on the valve body to form the valve.

[0003] Workbenches are suitable for various applications such as mold making, fitter work, testing, repair, and assembly. The design of a workbench allows workers to place the items to be processed stably. Different fields have different workbenches, and in the process of valve production, a valve processing work platform is required, which makes it more convenient for workers to use.

[0004] However, in actual work, it has been found that the height of traditional workbenches is fixed and cannot be adjusted, making them inconvenient for workers of different heights. In addition, the existing traditional workbench can only rotate in a plane. For special structural processing of valve bodies, such as inclined blind holes, the valve body cannot be processed by rotating in a plane. It is necessary to remove the valve body from the workbench, adjust the wall surface of the valve body, and then fix it back to the workbench. The operation is extremely inconvenient. Therefore, there is an urgent need to design a workbench for processing valves to solve the above problems. Utility Model Content

[0005] This invention provides a workbench with a reasonable structural design for processing valves, addressing the technical problems existing in prior art. This invention allows for workpiece rotation adjustment in a plane and flipping adjustment around a transverse axis, and also allows for workbench height adjustment, facilitating use by workers of different heights.

[0006] The technical solution adopted by this utility model to solve the technical problems existing in the prior art is as follows: A workbench for processing valves includes a frame, a lifting drive device installed on the frame, a rotary drive device installed at the lifting end of the lifting drive device, and a first positioning device and a second positioning device arranged opposite to each other. An adjusting device is installed at the rotating end of the rotary drive device for adjusting the distance between the first positioning device and the second positioning device. The first positioning device includes a first positioning seat connected to the adjusting device, a first rotating shaft arranged laterally rotatably connected to the first positioning seat, a rotating mounting seat fixedly connected to the inner end of the first rotating shaft, multiple sets of shock-absorbing and buffering components installed on the rotating mounting seat, and positioning clamps installed through the multiple sets of shock-absorbing and buffering components. A rotating positioning component is installed between the outer end of the first rotating shaft and the first positioning seat for driving the rotating mounting seat to rotate and lock. The second positioning device includes a second positioning seat connected to the adjusting device, a second rotating shaft arranged laterally rotatably connected to the second positioning seat, a rotating shaft plate fixedly connected to the inner end of the second rotating shaft, and a laterally arranged positioning pin installed on the inner side of the rotating shaft plate.

[0007] The advantages and positive effects of this utility model are as follows: This utility model provides a workbench for processing valves. By setting a first positioning device and a second positioning device that can move in opposite directions, the valve body workpiece placed between the two can be clamped and fixed. Since the flipping shaft plate is rotatably connected to the second positioning seat and the flipping mounting seat is rotatably connected to the first positioning seat, in conjunction with the flipping positioning component, the clamped workpiece can be rotated at a certain angle according to the processing needs, thus facilitating the operator to process the special side structure of the valve body without having to unload and reload the workpiece, making operation convenient. The shock-absorbing buffer component can play a shock-absorbing role during the processing operation. The adjustable distance device can automatically adjust the distance between the first positioning device and the second positioning device, making the first positioning device and the second positioning device suitable for clamping and positioning valve bodies of different specifications and sizes, and automatically clamping the workpiece without the need for manual operation by the operator. The lifting drive device can adjust the height of the first positioning device and the second positioning device according to the height of the operator, making the height of this utility model convenient for the operator to operate. The rotary drive device can drive the workpiece clamped by the first positioning device and the second positioning device to rotate in the plane, thus facilitating the operator's operation without the need for the operator to walk around the workpiece. This invention enables the workpiece to be rotated and adjusted in a plane, as well as flipped around a horizontal axis. It also allows for the adjustment of the worktable height, making it convenient for workers of different heights to use.

[0008] Preferably, the flip positioning assembly includes a flip groove wheel coaxially fixed to the outer end of the first flip shaft, and a flip handwheel mounted on the flip groove wheel; it also includes a guide sleeve mounting seat fixed to the first positioning seat, a guide sleeve fixed to the guide sleeve mounting seat and a locking guide rod slidably connected thereto passing through the guide sleeve, a rotating wheel seat fixed to the upper end of the locking guide rod, and a return spring passing through the locking guide rod between the rotating wheel seat and the guide sleeve and in abutting contact with both; a locking wheel is rotatably connected to the rotating wheel seat, and the locking wheel engages with the flip groove wheel.

[0009] Preferably, multiple sets of arc-shaped grooves are evenly distributed circumferentially on the outer peripheral wall of the tilting wheel, and the upper part of the locking wheel engages with the arc-shaped grooves.

[0010] Preferably, the shock absorption and buffer assembly includes a buffer guide sleeve fixedly attached to the flip mounting base, a buffer guide rod slidably connected to the buffer guide sleeve, the buffer guide rod being arranged laterally and its inner end being connected to the positioning clamping block, a limit disc being installed at the outer end of the buffer guide rod, and a buffer spring being installed on the buffer guide rod between the positioning clamping block and the buffer guide sleeve.

[0011] Preferably, the lifting drive device includes a lifting cylinder fixedly connected to the frame, with the extended end of the lifting cylinder facing upward and a lifting seat plate installed thereon; at least two sets of lifting guide sleeves are installed side by side on the frame, and the device also includes multiple sets of lifting support rods installed on the lifting seat plate, which are respectively inserted and slidably engaged with each of the lifting guide sleeves.

[0012] Preferably, the rotary drive device includes a rotary support mounted on the lifting drive device and a rotary mounting base mounted on the rotary support, and a rotary motor mounted on the lifting drive device, with a drive gear meshing with the rotary support on the output shaft of the rotary motor; a limit collision block is fixedly connected to the bottom of the rotary mounting base, and a limit component that collides and engages with the limit collision block is mounted on the lifting end of the lifting drive device.

[0013] Preferably, the adjusting device includes a laterally arranged adjusting guide rod fixed to the rotary drive device, and a first positioning device and a second positioning device slidably connected to the adjusting guide rod via a slider; it also includes a first lead screw and a second lead screw rotatably connected to the adjusting device and arranged parallel to the adjusting guide rod, the first lead screw and the second lead screw rotating in opposite directions and connected by a coupling, a first lead screw seat mounted on the first lead screw via a lead screw nut, and a second lead screw seat mounted on the second lead screw via a lead screw nut, the first lead screw seat and the second lead screw seat being respectively connected to the first positioning device and the second positioning device; it also includes an adjusting drive assembly mounted on the rotary drive device for driving the first lead screw and the second lead screw to rotate synchronously. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the main structure of this utility model;

[0015] Figure 2 This is a three-dimensional structural diagram of the lower main body of this utility model;

[0016] Figure 3 This is a three-dimensional structural diagram of the upper main body of this utility model;

[0017] Figure 4 This is a three-dimensional structural diagram of the first positioning device and the second positioning device in this utility model.

[0018] In the diagram: 1. Frame; 2. Lifting drive device; 2-1. Lifting cylinder; 2-2. Lifting support rod; 2-3. Lifting guide sleeve; 2-4. Floating joint; 2-5. Lifting seat plate; 3. Rotary drive device; 3-1. Rotary motor; 3-2. Drive gear; 3-3. Limiting component; 3-4. Rotary mounting base; 3-5. Rotary support component; 3-6. Limiting collision block; 4. Adjusting device; 4-1. Adjusting motor; 4-2. Adjusting transmission pair; 4-3. Support pad; 4-4. First lead screw nut; 4-5. First lead screw; 4-6. Second lead screw; 4-7. Second lead screw nut; 4-8. Adjusting guide rod; 5. First positioning device. 5-1. Positioning clamp; 5-2. Shock absorption and buffer assembly; 5-2-1. Buffer spring; 5-2-2. Buffer guide sleeve; 5-2-3. Limiting disc; 5-2-4. Buffer guide rod; 5-3. Flip mounting base; 5-4. First positioning seat; 5-5. First flip shaft; 5-6. Flip positioning assembly; 5-6-1. Locking wheel; 5-6-2. Return spring; 5-6-3. Locking guide rod; 5-6-4. Guide sleeve mounting base; 5-6-5. Flip handwheel; 5-6-6. Flip grooved wheel; 6. Second positioning device; 6-1. Second flip shaft; 6-2. Second positioning seat; 6-3. Flip shaft plate; 6-4. Positioning pin. Detailed Implementation

[0019] To further understand the invention content, features, and effects of this utility model, the following embodiments are provided in detail:

[0020] See Figure 1 The workbench for processing valves according to this utility model includes a frame 1, a lifting drive device 2 is installed on the frame 1, and a rotary drive device 3 is installed at the lifting end of the lifting drive device 2.

[0021] like Figure 2As shown, the aforementioned lifting drive device 2 includes a lifting cylinder 2-1 fixedly connected to the frame 1, with the extended end of the lifting cylinder 2-1 facing upwards and fitted with a lifting seat plate 2-5; at least two sets of lifting guide sleeves 2-3 are mounted side-by-side on the frame 1, and multiple sets of lifting support rods 2-2 are mounted on the lifting seat plate 2-5, each respectively engaging with and slidingly fitting with a lifting guide sleeve 2-3. In this embodiment, two sets of lifting cylinders 2-1 are provided, and a floating joint 2-4 is installed at the extended end of each lifting cylinder 2-1, connecting it to the lifting seat plate 2-5 via the floating joint 2-4. Additionally, four sets of lifting guide sleeves 2-3 are provided.

[0022] like Figure 2 As shown, the rotary drive device 3 includes a rotary support 3-5 mounted on the lifting seat plate 2-5 in the lifting drive device 2, and a rotary mounting seat 3-4 mounted on the rotary support 3-5. It also includes a rotary motor 3-1 mounted on the lifting drive device 2, and a drive gear 3-2 that meshes with the rotary support 3-5 is keyed to the output shaft of the rotary motor 3-1. The rotary support 3-5 includes an inner ring fixed to the lifting seat plate 2-5, and an outer ring rotatably connected to the inner ring. The outer ring has several teeth on its outer wall, which mesh with the drive gear 3-2. The outer ring is connected to the rotary mounting seat 3-4.

[0023] To limit the rotation angle of the rotary drive device 3, a limiting collision block 3-6 is fixedly attached to the bottom of the rotary mounting base 3-4. The device also includes a limiting component 3-3 mounted on the lifting end of the lifting drive device 2, which collides with the limiting collision block 3-6. The limiting component 3-3 includes a mounting base fixed to the lifting seat plate 2-5, on which a limiting screw and a hydraulic buffer are installed. In this embodiment, the number of limiting components 3-3 can be set according to the required rotation angle in the plane. If the rotation angle is 360 degrees, one set of limiting components 3-3 is provided; if the rotation angle is 180 degrees, two sets of limiting components 3-3 are provided. The limiting collision block 3-6 has a cross-shaped structure.

[0024] like Figure 1 As shown, this embodiment also includes a first positioning device 5 and a second positioning device 6 arranged opposite to each other, and an adjusting device 4 is installed on the rotating end of the rotary drive device 3 to adjust the distance between the first positioning device 5 and the second positioning device 6.

[0025] like Figure 3 and Figure 4As shown, the first positioning device 5 includes a first positioning seat 5-4 connected to the adjusting device 4. A first rotating shaft 5-5, arranged laterally, is rotatably connected to the first positioning seat 5-4. A rotating mounting seat 5-3 is fixedly connected to the inner end of the first rotating shaft 5-5. Multiple sets of shock-absorbing and buffering assemblies 5-2 are installed on the rotating mounting seat 5-3, and positioning clamps 5-1 are installed through the multiple sets of shock-absorbing and buffering assemblies 5-2. A rotating positioning assembly 5-6 is installed between the outer end of the first rotating shaft 5-5 and the first positioning seat 5-4 to drive the rotating mounting seat 5-3 to rotate and lock. Furthermore, a groove adapted to the outer contour of the valve component to be processed is provided at the inner end of the positioning clamp 5-1.

[0026] like Figure 4 As shown, the aforementioned flipping positioning assembly 5-6 includes a flipping grooved wheel 5-6-6 coaxially fixed to the outer end of the first flipping shaft 5-5, and a flipping handwheel 5-6-5 mounted on the flipping grooved wheel 5-6-6; it also includes a guide sleeve mounting seat 5-6-4 fixed to the first positioning seat 5-4, a guide sleeve fixed to the guide sleeve mounting seat 5-6-4, and a locking guide rod 5-6-3 slidably connected to the guide sleeve; a rotating wheel seat fixed to the upper end of the locking guide rod 5-6-3; a return spring 5-6-2 located between the rotating wheel seat and the guide sleeve and in abutting contact with both of them; and a locking wheel 5-6-1 rotatably connected to the rotating wheel seat, which engages with the flipping grooved wheel 5-6-6. The outer peripheral wall of the flipping grooved wheel 5-6-6 has multiple sets of arc-shaped grooves evenly distributed circumferentially, and the upper part of the locking wheel 5-6-1 engages with the arc-shaped grooves. The number of the aforementioned arc-shaped grooves can be determined based on the angle at which the valve body to be processed needs to be flipped.

[0027] In actual operation, the operator can operate the flip handwheel 5-6-5 to rotate the flip groove wheel 5-6-6, which in turn drives the flip mounting base 5-3 to flip. During the rotation of the flip groove wheel 5-6-6, the locking wheel 5-6-1 is pressed down and the return spring 5-6-2 is compressed. After the flip groove wheel 5-6-6 flips to the preset angle, the locking wheel 5-6-1 moves upward to reset under the action of the return spring 5-6-2, and then locks into the corresponding arc groove.

[0028] like Figure 4As shown, the aforementioned shock-absorbing and buffering assembly 5-2 includes a buffer guide sleeve 5-2-2 fixedly connected to the flip mounting base 5-3. A buffer guide rod 5-2-4, slidably connected to the buffer guide sleeve 5-2-2, passes through the buffer guide sleeve 5-2-2. The buffer guide rod 5-2-4 is arranged laterally, and its inner end is connected to the positioning clamping block 5-1. A limit disc 5-2-3 is installed at the outer end of the buffer guide rod 5-2-4. A buffer spring 5-2-1, located between the positioning clamping block 5-1 and the buffer guide sleeve 5-2-2, passes through the buffer guide rod 5-2-4. In this embodiment, two sets of the aforementioned shock-absorbing and buffering assembly 5-2 are provided. The shock-absorbing and buffering assembly 5-2 can provide shock absorption during processing.

[0029] Further, such as Figure 3 and Figure 4 As shown, the second positioning device 6 includes a second positioning seat 6-2 connected to the adjusting device 4. A second rotating shaft 6-1, arranged laterally, is rotatably connected to the second positioning seat 6-2. A rotating shaft plate 6-3 is fixed to the inner end of the second rotating shaft 6-1. A positioning pin 6-4, arranged laterally, is installed on the inner side of the rotating shaft plate 6-3. In this embodiment, the positioning pin 6-4 and the second rotating shaft 6-1 installed on the rotating shaft plate 6-3 are misaligned.

[0030] like Figure 3 As shown, the aforementioned adjusting device 4 includes a laterally arranged adjusting guide rod 4-8 fixedly connected to the rotary mounting base 3-4 in the rotary drive device 3. The first positioning device 5 and the second positioning device 6 are slidably connected to the adjusting guide rod 4-8 via a slider. It also includes a first lead screw 4-5 and a second lead screw 4-6 rotatably connected to the adjusting device 4 and arranged parallel to the adjusting guide rod 4-8. The first lead screw 4-5 and the second lead screw 4-6 rotate in opposite directions and are connected by a coupling. A first lead screw nut seat 4-4 is mounted on the first lead screw 4-5 via a lead screw nut, and a second lead screw nut seat 4-7 is mounted on the second lead screw 4-6 via a lead screw nut. The first lead screw nut seat 4-4 and the second lead screw nut seat 4-7 are respectively connected to the first positioning device 5 and the second positioning device 6. Furthermore, support pads 4-3 are installed on both the first lead screw nut seat 4-4 and the second lead screw nut seat 4-7, and the two sets of support pads 4-3 are respectively connected to the first positioning device 5 and the second positioning device 6.

[0031] The pitch adjustment device 4 also includes a pitch adjustment drive assembly mounted on the rotary drive device 3 for driving the first lead screw 4-5 and the second lead screw 4-6 to rotate synchronously. The pitch adjustment drive assembly includes a pitch adjustment motor 4-1 mounted on the rotary mounting base 3-4, and a pitch adjustment transmission pair 4-2 installed between the output shaft of the pitch adjustment motor 4-1 and the first lead screw 4-5. The pitch adjustment transmission pair 4-2 is a sprocket transmission pair, mainly including a driving sprocket keyed to the output shaft of the pitch adjustment motor 4-1, and a driven sprocket keyed to the end of the first lead screw 4-5. A chain is driven between the driving sprocket and the driven sprocket. A slot is provided on the rotary mounting base 3-4 for the chain to pass through.

[0032] Working principle: In actual operation, the lifting cylinder 2-1 in the lifting drive device 2 is activated, and the height of the lifting seat plate 2-5 is adjusted according to the height of the worker, thereby adjusting the height of the first positioning device 5 and the second positioning device 6, so that the height of this utility model is convenient for the worker to operate.

[0033] Then, the adjusting motor 4-1 in the adjusting device 4 is started, which drives the first lead screw 4-5 and the second lead screw 4-6 to rotate synchronously, which drives the first positioning device 5 and the second positioning device 6 to move towards each other, thereby clamping and positioning the valve body located between the first positioning device 5 and the second positioning device 6. The positioning pin 6-4 in the second positioning device 6 is inserted into the port of the valve body, and the positioning clamp 5-1 in the first positioning device 5 clamps and positions the outside of the valve body, thereby realizing the clamping and positioning of the valve body.

[0034] After completing the above clamping and positioning, the operator can perform processing operations on the valve body workpiece as needed. According to the processing requirements, the rotary motor 3-1 is started, which drives the rotary mounting base 3-4 to rotate in the plane, thereby driving the first positioning device 5 and the second positioning device 6 to rotate, so as to achieve the purpose of rotating the workpiece. If necessary, the operator can operate the flip handwheel 5-6-5 to rotate the flip groove wheel 5-6-6, thereby driving the flip mounting base 5-3 to flip, so as to achieve the purpose of flipping the clamped workpiece. There is no need to unload the workpiece and reload it, making the operation convenient.

Claims

1. A workbench for machining valves, characterized in that: The system includes a frame (1), on which a lifting drive device (2) is mounted, and a rotary drive device (3) is mounted at the lifting end of the lifting drive device (2). It also includes a first positioning device (5) and a second positioning device (6) arranged opposite to each other. A distance adjustment device (4) is mounted at the rotating end of the rotary drive device (3) to adjust the distance between the first positioning device (5) and the second positioning device (6). The first positioning device (5) includes a first positioning seat (5-4) connected to the distance adjustment device (4). A first rotating shaft (5-5) arranged laterally is rotatably connected to the first positioning seat (5-4). A rotating mounting seat (5-3) is fixedly connected to the inner end of the first rotating shaft (5-5). Multiple sets of shock-absorbing and buffering components (5-2) are installed on 5-3, and a positioning clamp (5-1) is installed through the multiple sets of shock-absorbing and buffering components (5-2). A flip positioning component (5-6) is installed between the outer end of the first flip shaft (5-5) and the first positioning seat (5-4) to drive the flip mounting seat (5-3) to flip and lock. The second positioning device (6) includes a second positioning seat (6-2) connected to the adjusting device (4). A second flip shaft (6-1) arranged laterally is rotatably connected to the second positioning seat (6-2). A flip shaft plate (6-3) is fixed to the inner end of the second flip shaft (6-1). A positioning pin (6-4) arranged laterally is installed on the inner side of the flip shaft plate (6-3).

2. The workbench for processing valves as described in claim 1, characterized in that: The flip positioning assembly (5-6) includes a flip groove wheel (5-6-6) coaxially fixed to the outer end of the first flip shaft (5-5), and a flip handwheel (5-6-5) is installed on the flip groove wheel (5-6-6); it also includes a guide sleeve mounting seat (5-6-4) fixed to the first positioning seat (5-4), a guide sleeve fixed to the guide sleeve mounting seat (5-6-4) and a locking guide rod (5-6-3) slidably connected to the guide sleeve, a rotating wheel seat fixed to the upper end of the locking guide rod (5-6-3), a return spring (5-6-2) located between the rotating wheel seat and the guide sleeve and in abutting contact with the two on the locking guide rod (5-6-3); a locking wheel (5-6-1) is rotatably connected to the rotating wheel seat and engages with the flip groove wheel (5-6-6).

3. The workbench for processing valves as described in claim 2, characterized in that: in The outer peripheral wall of the flipping groove wheel (5-6-6) is provided with multiple sets of arc-shaped grooves evenly distributed along the circumference, and the upper part of the locking wheel (5-6-1) is engaged with the arc-shaped grooves.

4. The workbench for processing valves as described in claim 1, characterized in that: The shock absorption and buffer assembly (5-2) includes a buffer guide sleeve (5-2-2) fixedly attached to a flip mounting base (5-3), a buffer guide rod (5-2-4) slidably connected to the buffer guide sleeve (5-2-2) and the buffer guide rod (5-2-4) being arranged laterally and having its inner end connected to a positioning clamp (5-1), and a limit disc (5-2-3) being installed at the outer end of the buffer guide rod (5-2-4); and a buffer spring (5-2-1) being inserted through the buffer guide rod (5-2-4) between the positioning clamp (5-1) and the buffer guide sleeve (5-2-2).

5. The workbench for processing valves as described in claim 1, characterized in that: The lifting drive device (2) includes a lifting cylinder (2-1) fixedly connected to the frame (1), with the extended end of the lifting cylinder (2-1) facing upward and a lifting seat plate (2-5) installed thereon; at least two sets of lifting guide sleeves (2-3) are installed side by side on the frame (1), and also includes multiple sets of lifting support rods (2-2) installed on the lifting seat plate (2-5) that are respectively inserted and slidably engaged with each lifting guide sleeve (2-3).

6. The workbench for processing valves as described in claim 1, characterized in that: The rotary drive device (3) includes a rotary support (3-5) mounted on the lifting drive device (2) and a rotary mounting base (3-4) mounted on the rotary support (3-5). It also includes a rotary motor (3-1) mounted on the lifting drive device (2). A drive gear (3-2) that meshes with the rotary support (3-5) is keyed to the output shaft of the rotary motor (3-1). A limit collision block (3-6) is fixedly attached to the bottom of the rotary mounting base (3-4). It also includes a limit component (3-3) mounted on the lifting end of the lifting drive device (2) that collides with the limit collision block (3-6).

7. The workbench for processing valves as described in claim 1, characterized in that: The adjusting device (4) includes a laterally arranged adjusting guide rod (4-8) fixed to the rotary drive device (3), and a first positioning device (5) and a second positioning device (6) slidably connected to the adjusting guide rod (4-8) via a slider; it also includes a first lead screw (4-5) and a second lead screw (4-6) rotatably connected to the adjusting device (4) and arranged parallel to the adjusting guide rod (4-8), the first lead screw (4-5) and the second lead screw (4-6) rotating in opposite directions and connected by a coupling, a first lead screw nut seat (4-4) mounted on the first lead screw (4-5) via a lead screw nut, a second lead screw nut seat (4-7) mounted on the second lead screw (4-6) via a lead screw nut, the first lead screw nut seat (4-4) and the second lead screw nut seat (4-7) respectively connected to the first positioning device (5) and the second positioning device (6); it also includes an adjusting drive assembly mounted on the rotary drive device (3) for driving the first lead screw (4-5) and the second lead screw (4-6) to rotate synchronously.

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