A main beam adjustment device for installing a tailwater maintenance platform

Abstract

The present invention discloses a main beam adjustment device for installing a tailwater inspection platform, comprising a base, a main beam end clamping assembly, a horizontal movement assembly and a height adjustment assembly; the base is used to be connected at the entrance of the tailwater pipe; the main beam end clamping assembly is arranged on the base and is used to clamp and fix one end of the main beam; the horizontal movement assembly is connected between the base and the main beam end clamping assembly, and is used to drive the main beam end clamping assembly to move in the horizontal direction; the height adjustment assembly is connected between the horizontal movement assembly and the main beam end clamping assembly, and is used to move with the horizontal movement assembly and drive the main beam end clamping assembly to move in the vertical direction; compared with the prior art, the present invention can more quickly move and adjust the main beam end clamped by the main beam end clamping assembly.

Description

Technical Field

[0001] The invention relates to the technical field of adjusting frame structures, and in particular to a main beam adjusting device for installing a tailwater maintenance platform. Background Art

[0002] During the maintenance of a hydro-turbine generator set, the runner, blades, cone pipe, and tailwater pipe are standard maintenance items. The maintenance of these items requires a maintenance platform, so the maintenance platform needs to be set up before the tailwater pipe is repaired.

[0003] The tailwater inspection platform is composed of 3 main beams and 9 secondary beams. When installing the 3 main beams, they need to be inserted into the holes on the volute side. When installing the main beams, 6 people are needed to cooperate, 3 of whom push at the entrance of the tailwater pipe, and the other 3 use cables to adjust the position of the main beam at the fixed guide vane.

[0004] Because the tailwater inspection platform is mainly supported by three main beams, each main beam is divided into two sections, and the weight of each section exceeds 100 kilograms. At the same time, the rope and the surface of the main beam are at an angle less than 90°. In the process of using cables to adjust the direction of the main beam, the person pulling the cable will bear a large weight, and there is a great construction risk.

[0005] In order to solve the above problems, the patent document with application number CN202122343452.8 discloses a main beam adjustment device for a tailwater maintenance platform, including an adjustment plate movably mounted on the outside of one end of the main beam, a transmission frame movably mounted on the outside of the adjustment plate, and two adjustment components are detachably connected to the outer wall of the transmission frame. The two adjustment components are arranged in an orthogonal manner and can be detachably connected to the entrance of the tailwater pipe. The two adjustment components are used to move the transmission frame in the up and down or left and right directions.

[0006] The two adjustment components in the main beam adjustment device of the tailwater inspection platform are installed at different positions of the tailwater pipe entrance, and two workers need to cooperate or one person needs to move continuously to adjust, which is relatively troublesome to operate. Summary of the invention

[0007] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a main beam adjustment device for installing a tailwater inspection platform, so as to solve the problem in the prior art that the two adjustment components in the main beam adjustment device of the existing tailwater inspection platform are installed at different positions at the entrance of the tailwater pipe, and the adjustment requires the cooperation of two staff members or one person to continuously move the position, which is relatively troublesome to operate.

[0008] To achieve the above object, the present invention adopts the following technical solution: a main beam adjustment device for installing a tailwater maintenance platform, comprising:

[0009] A base, the base being used to be connected to the entrance of the tailwater pipe;

[0010] A main beam end clamping assembly, which is arranged on the base and is used to clamp and fix one end of the main beam;

[0011] A horizontal moving assembly, which is connected between the base and the main beam end clamping assembly and is used to drive the main beam end clamping assembly to move in a horizontal direction;

[0012] A height adjustment component is connected between the horizontal moving component and the main beam end clamping component, and is used to move with the horizontal moving component and drive the main beam end clamping component to move in the vertical direction.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The main beam adjustment device for installing the tailwater inspection platform is mainly composed of a base, a main beam end clamping assembly, a horizontal movement assembly and a height adjustment assembly. The base is fixedly connected to the entrance of the tailwater pipe, and one end of the main beam is clamped and fixed by the main beam end clamping assembly. Only one person needs to adjust the horizontal movement assembly in one direction to move in the horizontal direction, and then drive the height adjustment assembly to drive one end of the main beam to move in the horizontal direction through the main beam end clamping assembly; then adjust the height adjustment assembly to move in the vertical direction, and drive one end of the main beam to move in the vertical direction through the main beam end clamping assembly, so as to align one end of the main beam with the hole on the volute side. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0016] Figure 2 for Figure 1 A partial cross-sectional view of the middle section A;

[0017] Figure 3 for Figure 1 A partial cross-sectional view of the interior of the middle protective shell;

[0018] Figure 4 for Figure 3 Partial cross-sectional view along line BB;

[0019] Figure 5 for Figure 1 Partial cross-sectional view of the middle support column.

[0020] The figure marks in the drawings of the specification include: base 1, fourth screw 2, positioning rod 3, moving block 4, guide rod 5, support plate 6, moving cylinder 7, telescopic rod 8, first screw 9, mounting cover 10, driving pulley 11, driven pulley 12, belt 13, transmission shaft 14, housing 15, driver 16, driving gear 17, driven gear 18, protective shell 19, key shaft 20, top plate 21, clamping claw 22, positioning column 23, traction rod 24, support column 25, second screw 26, adjustment handle 27, mounting slot 28, bevel gear 29, micro stepping motor 30. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below through specific embodiments:

[0022] like Figure 1 As shown, an embodiment of the present invention proposes a main beam adjustment device for installing a tailwater maintenance platform, comprising a base 1, a main beam end clamping assembly, a horizontal movement assembly, and a height adjustment assembly;

[0023] Wherein, the base 1 is used to be connected to the entrance of the tailwater pipe;

[0024] The main beam end clamping assembly is arranged on the base 1 and is used to clamp and fix one end of the main beam;

[0025] The horizontal moving assembly is connected between the base 1 and the main beam end clamping assembly, and is used to drive the main beam end clamping assembly to move in the horizontal direction;

[0026] The height adjustment component is connected between the horizontal moving component and the main beam end clamping component, and is used to move with the horizontal moving component and drive the main beam end clamping component to move in the vertical direction.

[0027] The main beam adjustment device for installing the tailwater inspection platform mainly consists of a base 1, a main beam end clamping assembly, a horizontal movement assembly and a height adjustment assembly. The base 1 is fixedly connected to the entrance of the tailwater pipe, and one end of the main beam is clamped and fixed by the main beam end clamping assembly. Only one person needs to adjust the horizontal movement assembly in one direction to move in the horizontal direction, and then drive the height adjustment assembly to drive one end of the main beam to move in the horizontal direction through the main beam end clamping assembly; then adjust the height adjustment assembly to move in the vertical direction, and drive one end of the main beam to move in the vertical direction through the main beam end clamping assembly, so as to align one end of the main beam with the hole on the volute side.

[0028] In this embodiment, the base 1 can be fixedly connected to the tailwater pipe entrance door by bolts, and its installation and disassembly are convenient and quick.

[0029] like Figure 1 and Figure 2As shown, according to another embodiment of the present invention, a main beam adjustment device for installing a tailwater maintenance platform, wherein the horizontal movement component includes a first input shaft to drive its operation, and the height adjustment component includes a second input shaft to drive its operation, and a selective electric drive component is provided on the base 1, and the selective electric drive component is connected to the first input shaft or the second input shaft to drive the horizontal movement component or the height adjustment component to operate.

[0030] Here: a selective electric drive component is used to selectively connect to the first input shaft or the second input shaft, so that the horizontal moving component can be adjusted in the horizontal direction or the height adjusting component can be adjusted in the vertical direction, so that a power source can be used to efficiently drive the main beam end clamped by the main beam end clamping component to move in the horizontal or vertical direction, so as to quickly align the main beam end with the hole on the volute side and then insert it into the hole on the volute side.

[0031] Based on the above solution: the horizontal moving assembly used also includes a fourth screw rod 2, a positioning rod 3 and a moving block 4;

[0032] The fourth screw rod 2 is arranged in the horizontal direction and is rotatably connected to the base 1, and one end of the fourth screw rod 2 is connected to the first input shaft;

[0033] The positioning rod 3 is fixedly connected to the base 1 and arranged parallel to the fourth screw rod 2;

[0034] The moving block 4 is threadedly connected to the fourth screw rod 2 and is slidably connected to the positioning rod 3. The moving block 4 is also connected to the height adjustment component.

[0035] In this embodiment: the base 1 is composed of a bottom plate and two vertical plates arranged in parallel and at intervals on the top of the bottom plate, and the bottom plate is connected to the tailwater pipe entrance door; the positioning rod 3 and the fourth screw rod 2 are both connected between the two vertical plates, and the moving block 4 moves between the two vertical plates; when the selective electric drive component is connected to the first input shaft, the first input shaft can be the same axis as the fourth screw rod 2, the selective electric drive component drives the fourth screw rod 2 to rotate, and the positioning rod 3 guides the moving block 4 to move the moving block 4 horizontally between the two vertical plates; at this time, the moving block 4 drives the height adjustment component to move horizontally, and the height adjustment component drives the clamped main beam end to move horizontally through the main beam end clamping component.

[0036] The height adjustment assembly used also includes a height adjustment part, a guide rod 5 and a transmission member;

[0037] The height adjustment part is connected between the horizontal moving assembly and the main beam end clamping assembly;

[0038] The guide rod 5 is connected to the second input shaft and arranged in the horizontal direction;

[0039] The transmission member is connected between the guide rod 5 and the height adjustment portion, and the transmission member is slidably connected along the axial direction of the guide rod 5 and is always transmission-connected.

[0040] Here: the guide rod 5 is specifically a spline shaft 20, the guide rod 5 and the second input shaft can be the same shaft, and the end of the guide rod 5 away from the second input shaft is rotatably connected to one of the vertical plates; the height adjustment part is specifically fixedly connected to the moving block 4, and when the selective electric drive assembly is connected to the first input shaft, the height adjustment part moves with the moving block 4, and the height adjustment part and the guide rod 5 are always kept in a transmission connection state through the connection method between the transmission member and the guide rod 5, and the transmission member moves with the height adjustment part, and the horizontal movement of the moving block 4 will not be restricted; when the selective electric drive assembly is connected to the second input shaft, the height adjustment part is operated through the cooperation of the guide rod 5 and the transmission member, and the height adjustment part drives the clamped main beam end to move in the vertical direction through the main beam end clamping assembly.

[0041] Based on the above solution: the height adjustment part used includes a support plate 6 and a moving cylinder 7;

[0042] The support plate 6 is connected to the horizontal moving assembly, the transmission member is connected to the support plate 6 to move with it, and the support plate 6 is connected to the clamping assembly at the end of the main beam through a plurality of telescopic rods 8 arranged in the vertical direction;

[0043] The movable cylinder 7 is arranged in the vertical direction and its top end is fixedly connected to the clamping assembly at the end of the main beam, and its bottom end is internally threadedly connected to the first screw rod 9, and the first screw rod 9 is connected to the transmission member through a transmission structure.

[0044] In this embodiment: the support plate 6 is fixedly connected to the moving block 4. When the moving block 4 moves in the horizontal direction, the support plate 6 moves synchronously with the moving block 4. When the selective electric drive assembly is connected to the second input shaft, the transmission structure is transmitted through the cooperation of the guide rod 5 and the transmission member, and the transmission structure drives the first screw rod 9 to rotate. The moving cylinder 7 is moved along the axial direction of the first screw rod 9 through the guidance of multiple telescopic rods 8, so as to move the main beam end clamping assembly in the vertical direction. Among them, the number of telescopic rods 8 can be 4 and they are arranged in an array to stably support and guide the movement of the main beam end clamping assembly.

[0045] Further, the transmission member used includes a mounting cover 10, a driving pulley 11 and a driven pulley 12;

[0046] The mounting cover 10 is fixedly connected to the support plate 6 and the guide rod 5 freely passes through the mounting cover 10;

[0047] The driving pulley 11 is rotatably disposed in the mounting cover 10 and is slidably sleeved on the guide rod 5, and the driving pulley 11 is spline-connected to the guide rod 5;

[0048] The driven pulley 12 is connected to the transmission structure and the transmission pulley is connected to the driving pulley 11 via a belt 13 .

[0049] Specifically: the driving pulley 11 is rotatably connected to the inner wall of the mounting cover 10 through a connecting tube, and the connecting tube is movably sleeved on the outer side of the guide rod 5; when the support plate 6 moves along the horizontal direction with the moving block 4, the mounting cover 10 moves along the support plate 6, so that the driving pulley 11 moves along the axial direction of the guide rod 5, and because the driving pulley 11 is spline-connected with the guide rod 5, the driving pulley 11 and the guide rod 5 are always connected in transmission, and at the same time, the driving pulley 11 and the driven pulley 12 are kept in good transmission connection through the belt 13; when the selective electric drive assembly is connected to the second input shaft, the driving pulley 11 is driven to rotate through the guide rod 5, and the driving pulley 11 drives the pulley 11 to rotate the driven pulley 12 through the belt 13, and the driven pulley 12 rotates the first screw rod 9 through the transmission structure, and the moving cylinder 7 is guided by the multiple telescopic rods 8 to move along the axial direction of the first screw rod 9, so that the main beam end clamping assembly moves in the vertical direction. Here, the transmission structure can be a transmission shaft 14 connected to the driven pulley 12, the transmission shaft 14 is rotatably connected to the mounting plate arranged between the two telescopic rods 8, and the transmission shaft 14 and the first screw rod 9 are transmitted through two meshing bevel gears; a housing 15 can be fixedly set on the support plate 6, and the two bevel gears are rotatably set in the housing 15. The transmission shaft 14 and the first screw rod 9 can freely pass through the housing 15. The housing 15 protects the two bevel gears and also improves the transmission stability of the first screw rod 9 and the transmission shaft 14.

[0050] like Figure 1 , Figure 3 as well as Figure 4 As shown, according to another embodiment of the present invention, a main beam adjustment device for installing a tailwater maintenance platform, wherein the selective electric drive assembly includes a driver 16, a driving gear 17 and a driven gear 18;

[0051] Wherein, the driver 16 is arranged on the base 1;

[0052] The driving gear 17 is connected to the driver 16 to drive the rotation;

[0053] There are two driven gears 18 and both are meshed with the driving gear 17. A connecting hole is opened at the center of each driven gear 18. The first input shaft and the second input shaft are slidably arranged in the two connecting holes in a one-to-one correspondence and are connected to each other by a key connection.

[0054] In this embodiment: the driver 16 can be a stepper motor, and a protective shell 19 is fixedly installed on the base 1, and the driving gear 17 and the driven gear 18 are both rotatably installed in the protective shell 19; and specifically, two key holes that are aligned and connected with the two connecting holes are opened on the protective shell 19, and a key shaft 20 that is key-connected between the corresponding connecting hole and the first input shaft or the second input shaft is key-connected in each key hole. The corresponding key shaft 20 is slid to make the first input shaft or the second input shaft connected to the corresponding driven gear 18 in transmission. At this time, the driver 16 is running to rotate the driving gear 17, and the two driven gears 18 are driven to rotate by the driving gear 17 to drive the first input shaft or the second input shaft to rotate, so as to make the horizontal movement component or the height adjustment component operate.

[0055] Specifically, a keyway is formed at one end of the first input shaft and the second input shaft for key connection with the key shaft 20 , and the key shaft 20 is also key connected with the keyway hole formed on the inner wall of the corresponding connecting hole, so that the first input shaft or the second input shaft is connected to the corresponding driven gear 18 for transmission.

[0056] like Figure 1 and Figure 5 As shown, according to another embodiment of the present invention, a main beam adjustment device for installing a tailwater maintenance platform, wherein the main beam end clamping assembly includes a top plate 21, a center positioning portion and a clamping claw 22;

[0057] Wherein, the top plate 21 is connected to the height adjustment assembly;

[0058] The central positioning portion is connected to the top of the top plate 21 and includes a positioning column 23 which is arranged to slide in the vertical direction and can pass through the top thereof. The positioning column 23 is used to be embedded in a positioning hole opened on the side wall of one end of the main beam.

[0059] There are two clamping jaws 22 which are arranged opposite to each other on both sides of the central positioning part. One end of the two clamping jaws 22 is rotatably connected to the central positioning part. The middle parts of the two clamping jaws 22 are rotatably connected to the traction rod 24. The two traction rods 24 are connected by an adjusting member, which is used to drive the two traction rods 24 to move toward or away from each other.

[0060] In this embodiment: the top plate 21 is specifically fixedly connected to the telescopic rod 8 and the moving cylinder 7, and the top plate 21 moves synchronously with the moving cylinder 7. Place one end of the main beam on the top of the central positioning part, then move the positioning column 23 out and embed it into the positioning hole, and one end of the main beam is located between the two clamps 22, and the two traction rods 24 are moved toward each other through the adjustment member, so that the two clamps 22 rotate toward each other to clamp and fix the end of the main beam. When the end of the main beam is aligned with the hole on the volute side, the adjustment member is used to move the two traction rods 24 away from each other, so that the two clamps 22 rotate away from each other to release the clamping fixation of the end of the main beam, and at the same time, the positioning column 23 is moved in the opposite direction to move out of the positioning hole, so that the end of the main beam can be inserted into the hole on the volute side.

[0061] Based on the above solution, the central positioning part adopted also includes a support column 25, a second screw rod 26 and an adjustment handle 27;

[0062] The support column 25 is arranged vertically and its bottom end is fixedly connected to the top of the top plate 21. One end of each of the two clamping claws 22 is rotatably connected to the support column 25. A mounting groove 28 extending downward is formed at the top of the support column 25. The positioning column 23 is linearly slidably arranged in the mounting groove 28.

[0063] The second screw rod 26 is arranged in the installation groove 28 along the vertical direction and the top end thereof is threadedly connected to the positioning column 23;

[0064] One end of the adjustment handle 27 passes through the bottom of the installation groove 28 from the outside of the support column 25 and is connected to the bottom end of the second screw rod 26 through the transmission unit.

[0065] Here: the top surface of the support column 25 is an arc surface, which is convenient for increasing the contact area between the support column 25 and the cylindrical main beam, so as to improve the supporting stability of the main beam; the adjusting handle 27 is rotated to drive the second screw rod 26 to rotate through the transmission unit, and the second screw rod 26 drives the positioning column 23 to move in the vertical direction. Since the positioning column 23 is connected to the inner wall of the mounting groove 28 by a key connection, the positioning column 23 can move in the vertical direction during the rotation of the second screw rod 26; the top side of the positioning column 23 can pass through the notch of the mounting groove 28 and be embedded in the positioning hole or retreat from the positioning hole into the mounting groove 28; specifically, the transmission unit can be two bevel gears 29 meshing in the mounting groove 28, one of which is connected to the adjusting handle 27, and the other is connected to the second screw rod 26 for transmission.

[0066] Furthermore, an adjustment groove is opened at the top of the top plate 21 along the moving direction of the traction rod 24, and the adjustment member used includes a third screw rod, which is rotatably set in the adjustment groove and one end of which is passed through the outside of the top plate 21, and the ends of the two traction rods 24 away from the corresponding clamping jaws 22 are both threadedly connected to the third screw rod.

[0067] Specifically, the third screw is rotated to make the two traction rods 24 move toward or away from each other along the adjustment groove, and the two jaws 22 are rotated toward or away from each other to control the clamping and fixing state of the two jaws 22 on the end of the main beam; the two jaws 22 are both arc-shaped, which is conducive to relatively stable clamping and fixing of main beams of different sizes and cylindrical shapes; the third screw can also be driven to rotate by a micro stepping motor 30, and the micro stepping motor 30 and the driver 16 can be controlled by a switch to facilitate operation by the staff.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A main beam adjustment device for installing a tailwater maintenance platform, It is characterized in that include: A base, the base being used to be connected to the entrance of the tailwater pipe; A main beam end clamping assembly, which is arranged on the base and is used to clamp and fix one end of the main beam; A horizontal moving assembly, which is connected between the base and the main beam end clamping assembly and is used to drive the main beam end clamping assembly to move in a horizontal direction; A height adjustment component, which is connected between the horizontal moving component and the main beam end clamping component, and is used to move with the horizontal moving component and drive the main beam end clamping component to move in the vertical direction; The horizontal moving assembly includes a first input shaft driving the horizontal moving assembly to operate, the height adjusting assembly includes a second input shaft driving the height adjusting assembly to operate, and a selective electric drive assembly is arranged on the base, the selective electric drive assembly is connected to the first input shaft or the second input shaft to drive the horizontal moving assembly or the height adjusting assembly to operate; The selective electric drive assembly comprises: A driver, wherein the driver is arranged on a base; A driving gear connected to the driver to drive the rotation; There are two driven gears and both are meshed with the driving gear. A connecting hole is opened at the center of each driven gear. The first input shaft and the second input shaft are slidably arranged in the two connecting holes in a one-to-one correspondence and are connected in transmission by a key connection.

2. A main beam adjustment device for installing a tailwater maintenance platform according to claim 1, Features: The height adjustment assembly also includes: A height adjustment part, the height adjustment part is connected between the horizontal moving assembly and the main beam end clamping assembly; A guide rod, the guide rod is connected to the second input shaft and arranged in a horizontal direction; A transmission member is connected between the guide rod and the height adjustment portion, and the transmission member is slidably connected along the axial direction of the guide rod and is always transmission-connected.

3. A main beam adjustment device for installing a tailwater maintenance platform according to claim 2, Features: The height adjustment unit comprises: A support plate, wherein the support plate is connected to the horizontal moving assembly, the transmission member is connected to the support plate to move with the support plate, and the support plate is connected to the clamping assembly at the end of the main beam through a plurality of telescopic rods arranged in the vertical direction; The moving cylinder is arranged in the vertical direction and its top end is fixedly connected to the clamping assembly at the end of the main beam, and its bottom end is internally threadedly connected to a first screw rod, and the first screw rod is connected to the transmission member through a transmission structure.

4. A main beam adjustment device for installing a tailwater maintenance platform according to claim 3, Features: The transmission member comprises: A mounting cover, wherein the mounting cover is fixedly connected to the support plate and the guide rod freely passes through the mounting cover; A driving pulley, which is rotatably arranged in the mounting cover and slidably sleeved on the guide rod, and the driving pulley is spline-connected to the guide rod; The driven pulley is connected to the transmission structure and the transmission pulley is connected to the driving pulley through a belt transmission.

5. The main beam adjustment device for installing a tailwater maintenance platform according to claim 1, Features: The main beam end clamping assembly comprises: A top plate connected to the height adjustment assembly; A central positioning part, which is connected to the top of the top plate and includes a positioning column which is slidably arranged in the vertical direction and can pass through the top of the central positioning part, and the positioning column is used to be embedded in a positioning hole opened on the side wall of one end of the main beam; The clamping jaws are two and arranged opposite to each other on both sides of the central positioning part. One end of the two clamping jaws is rotatably connected to the central positioning part. The middle parts of the two clamping jaws are rotatably connected to the traction rod. The two traction rods are connected by an adjusting member, and the adjusting member is used to drive the two traction rods to move toward or away from each other.

6. A main beam adjustment device for installing a tailwater maintenance platform according to claim 5, Features: The center positioning portion also includes: A support column, wherein the support column is arranged vertically and the bottom end thereof is fixedly connected to the top of the top plate, one end of each of the two clamping claws is rotatably connected to the support column, a mounting groove extending downward is provided at the top end of the support column, and the positioning column is linearly slidably arranged in the mounting groove; A second screw rod, the second screw rod is arranged in the installation groove along the vertical direction and the top end of the second screw rod is connected to the positioning column by a thread; An adjusting handle, one end of which is inserted from the outside of the supporting column into the bottom of the mounting groove and then connected to the bottom end of the second screw rod through a transmission unit.

7. A main beam adjustment device for installing a tailwater maintenance platform according to claim 5, Features: The top of the top plate is provided with an adjustment slot along the moving direction of the traction rod, and the adjustment member comprises: The third screw rod is rotatably arranged in the adjustment groove and one end of the third screw rod is passed through the outside of the top plate. The ends of the two traction rods away from the corresponding clamping claws are both connected to the third screw rod thread.

8. The main beam adjustment device for installing a tailwater maintenance platform according to claim 1, Features: The horizontal movement component also includes: A fourth screw rod, the fourth screw rod is arranged in the horizontal direction and is rotatably connected to the base, and one end of the fourth screw rod is connected to the first input shaft; A positioning rod, the positioning rod is fixedly connected to the base and arranged parallel to the fourth screw rod; A moving block is threadedly connected to the fourth screw rod and slidably connected to the positioning rod, and the moving block is also connected to the height adjustment component.

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