Machining method for main speed reducer shell assembly of heavy-duty car

Abstract

The invention relates to the field of machining, in particular to a machining method for a main speed reducer shell assembly of a heavy-duty car, which comprises the following steps: S1, fixedly placing a group of main speed reducer shells on a group of machining bases of a rotary table; s2, a partition door on the machine tool is controlled to be opened, a rotary table is driven by a rotary assembly at the bottom of a machine tool base to periodically rotate by 60 degrees, and a machining base where the main speed reducer shell is placed is rotated into a machine tool machining box, sequentially machined through a milling station and a polishing station and then screwed out of the machining box; s3, a driving assembly at the top of the machining box moves to synchronously drive corresponding mounting sliding blocks on a milling station and a polishing station to deflect and linearly move, horizontal position adjustment is correspondingly conducted on a milling assembly and a polishing assembly, a first telescopic assembly drives the milling assembly to vertically move, a second telescopic assembly drives the polishing assembly to vertically move, and the milling assembly is driven to vertically move; and the main speed reducer shells on the milling station and the polishing station are milled and polished correspondingly.

Description

Technical Field

[0001] The present invention relates to the field of machining, and in particular to a machining method for the housing assembly of the main reducer of a heavy-duty vehicle. Background Art

[0002] The main reducer of a heavy-duty vehicle refers to the rear axle reducer in the rear axle of a heavy-duty vehicle, which is an important component in the rear axle of a heavy-duty vehicle. Its main function is to increase the torque from the transmission or the universal drive device, while reducing the rotational speed and changing the direction of torque transmission.

[0003] The housing of the main reducer is an important component of the reducer. As an external protection structure, it not only provides support and assembly space for internal components such as gears and bearings, but also plays a role in sealing, protection, and heat dissipation. During the production process of the main reducer housing, it is necessary to perform milling on it, and perform polishing operations on the machined surface after milling.

[0004] When the existing machining methods implement the above operations, it is often necessary to replace the machining head of the machine tool during the machining process to complete the milling and grinding treatment of the main reducer housing. Since the machine tool can only complete one machining process at a single time, during the machining process of the main reducer housing Summary of the Invention

[0005] The purpose of the present invention is to provide a machining method for the housing assembly of the main reducer of a heavy-duty vehicle to solve the above technical problems.

[0006] To achieve the above purpose, the present invention provides a machining method for the housing assembly of the main reducer of a heavy-duty vehicle, and the method includes the following steps:

[0007] S1: Place a group of main reducer housings on a group of machining bases of a rotary table, and fix the main reducer housings through the clamping components on the machining bases;

[0008] S2: Control the partition door on the machine tool to open, and drive the rotary table to rotate periodically by 60° through the rotary component at the bottom of the machine tool base, rotate the machining base with the main reducer housing placed thereon into the machining box of the machine tool, and then rotate out of the machining box after passing through the milling station and the polishing station in sequence;

[0009] S3: Move by the driving component at the top of the machining box, synchronously drive the corresponding mounting sliders on the milling station and the polishing station to deflect and linearly move, correspondingly adjust the horizontal positions of the milling component and the polishing component, drive the milling component to move vertically by the first telescopic component, and drive the polishing component to move vertically by the second telescopic component, and perform milling and polishing on the main reducer housing at the milling station and the polishing station respectively.

[0010] As a further solution of the present invention, the clamping assembly includes two groups of clamping blocks, positioning sliders, a double threaded rod, and a first motor;

[0011] The two groups of positioning sliders are slidably installed in the limit guide grooves opened on the processing base. The two groups of clamping blocks are fixedly installed on the corresponding positioning sliders. The double threaded rod is rotatably installed at the bottom of the processing base, and two groups of external threads are mirror - arranged on both sides of it. The two groups of external threads form a helical pair drive with the corresponding positioning sliders. The first motor is fixedly connected to one end of the double threaded rod and is used to drive the double threaded rod to rotate.

[0012] As a further solution of the present invention, the slewing assembly includes a slewing shaft, a bottom drive gear ring, a bottom drive gear, and a second motor;

[0013] The slewing shaft is coaxially installed at the bottom of the slewing table. The bottom drive gear ring is coaxially installed outside the slewing shaft. The bottom drive gear is meshed with the bottom drive gear ring and is driven to rotate by the second motor at the bottom of the machine tool base.

[0014] As a further solution of the present invention, the number of partition doors is two groups. The two groups of partition doors are slidably installed at the openings on both sides of the processing box through multiple positioning columns and are driven to move vertically by the drive cylinders at the upper ends of the openings.

[0015] As a further solution of the present invention, the drive assembly includes two groups of movable frames, drive screws, and a transmission assembly. The two groups of movable frames are deflectably installed in the fan - shaped avoidance grooves opened at the top of the processing box. The two groups of mounting sliders are slidably installed in the corresponding movable frames. One ends of the two groups of movable frames close to the center of the machine tool are fixedly connected to the slewing ring at the top of the processing box. The slewing ring is driven to rotate by the adjustment assembly at the top of the processing box. The two groups of drive screws are rotatably installed in the corresponding movable frames and form a helical pair drive with the corresponding mounting sliders. The ends of the two groups of drive screws are synchronously connected to the transmission assembly.

[0016] As a further solution of the present invention, the adjustment assembly includes a top drive gear ring, a top drive gear, and a third motor;

[0017] The top drive gear ring is coaxially installed outside the slewing ring. The top drive gear is meshed with the top drive gear ring and is driven to rotate by the third motor at the top of the processing box.

[0018] As a further solution of the present invention, the transmission assembly includes two groups of transmission shafts, transmission bevel gears, drive bevel gears, and a fourth motor;

[0019] Two groups of the transmission rods are coaxially and fixedly installed at the ends of the corresponding driving screws and penetrate through the communication holes on the rotating ring. Two groups of transmission bevel gears are coaxially and fixedly installed at the ends of the corresponding transmission shafts and are meshed with the driving bevel gear rotatably installed in the rotating ring, wherein the driving bevel gear is driven to rotate by a fourth motor.

[0020] As a further solution of the present invention, the first telescopic assembly includes a first telescopic rod, a first lifting block and a first guiding rod;

[0021] The first telescopic rod is fixedly installed on the corresponding mounting slider. The first lifting block is fixedly installed on the driving end surface at the bottom of the first telescopic rod. The bottom of the first lifting block is used for installing the milling assembly. Multiple groups of first guiding rods are fixedly installed on the upper side end surface of the first lifting block and are slidably connected with the guiding holes on the corresponding mounting sliders.

[0022] As a further solution of the present invention, the second telescopic assembly includes a second telescopic rod, a second lifting block and a second guiding rod;

[0023] The second telescopic rod is fixedly installed on the corresponding mounting slider. The second lifting block is fixedly installed on the driving end surface at the bottom of the second telescopic rod. The bottom of the second lifting block is used for installing the polishing assembly. Multiple groups of second guiding rods are fixedly installed on the upper side end surface of the second lifting block and are slidably connected with the guiding holes on the corresponding mounting sliders.

[0024] Compared with the prior art, in the present invention, three processing bases are evenly spaced on the rotating table at the bottom of the machine tool. A set of main reducer housings can be independently fixed on each processing base. When processing the main reducer housings, when the rotating assembly drives the rotating table to intermittently rotate by 60°, during the processing, the processing personnel can sequentially place the main reducer housings on the vacant processing bases outside the processing box, and the main reducer housings located in the processing box can perform milling and polishing operations, ensuring the continuity of the main reducer housings;

[0025] At the same time, the driving assembly at the upper end of the processing box can drive the milling assembly and the polishing assembly to move synchronously, moving the milling assembly and the polishing assembly synchronously to the same processing positions of two main reducer housings, so that the two processing assemblies can synchronously complete the processing operations of the corresponding main reducer housings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of a processing device for a main reducer housing assembly of a heavy-duty truck in the present invention.

[0027] Figure 2 In the present invention Figure 1 It is a schematic structural diagram after removing the processing box.

[0028] Figure 3In the present invention Figure 2 is a side schematic view.

[0029] Figure 4 is a structural schematic view of the slewing assembly in the present invention.

[0030] Figure 5 is a structural schematic view of the clamping assembly in the present invention.

[0031] In the drawings: 1, machine tool base; 2, rotary table; 3, machining base; 4, main reducer housing; 5, machining box; 6, partition door; 7, driving cylinder; 8, driving assembly; 801, movable frame; 802, mounting slider; 803, driving screw; 804, rotary ring; 805, top driving gear; 806, top transmission gear ring; 807, third motor; 808, transmission bevel gear; 809, driving bevel gear; 810, fourth motor; 811, transmission shaft; 9, first telescopic assembly; 901, first telescopic rod; 902, first guide rod; 903, first lifting block; 10, second telescopic assembly; 1001, second telescopic rod; 1002, second guide rod; 1003, second lifting block; 11, milling assembly; 12, polishing assembly; 13, slewing assembly; 1301, slewing shaft; 1302, bottom transmission gear ring; 1303, bottom driving gear; 1304, second motor; 14, clamping assembly; 1401, clamping block; 1402, positioning slider; 1403, double threaded rod; 1404, first motor. Detailed implementation manners

[0032] The technical solutions of the present invention will be further described in detail below in conjunction with the specific implementation manners.

[0033] As Figures 1 to 4 shown, in an embodiment of the present invention, a processing method for a main reducer housing 4 assembly of a heavy-duty vehicle, the method includes the following steps:

[0034] S1: Place a group of main reducer housings 4 on a group of machining bases 3 of the rotary table 2, and fix the main reducer housing 4 through the clamping assembly 14 on the machining base 3;

[0035] S2: Control the partition door 6 on the machine tool to open, and drive the rotary table 2 to rotate periodically by 60° through the slewing assembly 13 at the bottom of the machine tool base 1, rotate the machining base 3 with the main reducer housing 4 placed thereon into the machining box 5 of the machine tool, and after machining through the milling station and the polishing station in sequence, rotate out of the machining box 5;

[0036] S3: Driven by the drive assembly 8 at the top of the processing box 5, the corresponding mounting sliders 802 at the milling station and the polishing station are synchronously driven to deflect and linearly move, correspondingly adjusting the horizontal positions of the milling assembly 11 and the polishing assembly 12, and the milling assembly 11 is driven by the first telescopic assembly 9 to move vertically, and the polishing assembly 12 is driven by the second telescopic assembly 10 to move vertically, respectively milling and polishing the main reducer housing 4 at the milling station and the polishing station;

[0037] Specifically, in the present invention, the number of main reducer housings 4 fixed on the rotary table 2 is three groups. When the rotary assembly 13 drives the rotary table 2 to rotate, the processing personnel can sequentially place the main reducer housings 4 on the vacant processing bases 3 outside the processing box 5 at the beginning of the processing, and take out the main reducer housings 4 that have completed milling and polishing from the processing bases 3;

[0038] And during the processing, the partition doors 6 on both sides of the processing box 5 can be controlled to open, and the rotary table 2 is driven by the rotary assembly 13 to rotate 60°, and the processing base 3 with the main reducer housing 4 placed thereon is rotated and fed into the processing box 5. The milling assembly 11 and the polishing assembly 12 in the processing box 5 sequentially mill and polish the main reducer housing 4. At the same time, the drive assembly 8 at the upper end of the processing box 5 can drive the milling assembly 11 and the polishing assembly 12 to move synchronously, so that they can synchronously complete the processing operations on the corresponding main reducer housing 4.

[0039] As Figure 5 shown, in the embodiment of the present invention, the clamping assembly 14 includes two groups of clamping blocks 1401, positioning sliders 1402, a double threaded rod 1403 and a first motor 1404. The two groups of positioning sliders 1402 are slidably installed in the limit guide grooves opened on the processing base 3, and the two groups of clamping blocks 1401 are fixedly installed on the corresponding positioning sliders 1402. The double threaded rod 1403 is rotatably installed at the bottom of the processing base 3, and two groups of external threads are mirror-symmetrically arranged on both sides thereof. The two groups of external threads form a screw pair transmission with the corresponding positioning sliders 1402. The first motor 1404 is fixedly connected to one end of the double threaded rod 1403 and is used to drive the double threaded rod 1403 to rotate. In the present invention, after the operator installs the main reducer housing 4 on the corresponding processing base 3, the first motor 1404 can be used to drive the double threaded rod 1403 to rotate, and the transmission drives the two groups of positioning sliders 1402 to approach mirror-symmetrically, driving the two groups of clamping blocks 1401 to approach and positionally clamp the two ends of the main reducer housing 4. The clamping sides of the two groups of clamping blocks 1401 can be adaptively customized according to the clamping part sides of the main reducer housing 4.

[0040] As Figure 1 and Figure 4As shown in the figure, in the embodiment of the present invention, the slewing assembly 13 includes a slewing shaft 1301, a bottom drive gear ring 1302, a bottom drive gear 1303, and a second motor 1304. The slewing shaft 1301 is coaxially installed at the bottom of the slewing table 2. The bottom drive gear ring 1302 is coaxially installed outside the slewing shaft 1301. The bottom drive gear 1303 is meshed with the bottom drive gear ring 1302 and is driven to rotate by the second motor 1304 at the bottom of the machine tool base 1. When slewing drive of the slewing table 2 is required, the second motor 1304 drives the bottom drive gear 1303 to rotate, and the slewing shaft 1301 and the slewing table 2 are driven to rotate by meshing of the bottom drive gear;

[0041] Furthermore, each time the slewing assembly 13 can be used to drive the slewing table to perform a 60° rotation adjustment. When the slewing table 2 rotates a preset angle, at this time, the second motor 1304 stops running and restarts when the slewing table 2 slews again next time. In the present invention, the slewing table 2 is rotatably installed on the machine tool base 1. By setting the slewing shaft 1301 to be connected with the gear structure, while ensuring the rotation stability of the slewing table 2, the structural volume of the slewing assembly 13 is reduced.

[0042] As Figure 1 shown in the figure, in the embodiment of the present invention, the number of the partition doors 6 is two groups. The two groups of partition doors 6 are slidably installed at the openings on both sides of the processing box 5 through multiple positioning columns and are driven to move vertically by the drive cylinders 7 at the upper ends of the openings. Each time the slewing table 2 slews, the two groups of partition doors 6 need to be driven to rise first by the two groups of drive cylinders 7, leaving a passage for the processing base 3 and the main reducer housing 4 to rotate in and out. And after the slewing table 2 completes slewing, the drive cylinders 7 drive the partition doors 6 to reset and descend to seal the openings of the processing box 5.

[0043] As Figure 2 and Figure 3As shown, in the embodiment of the present invention, the driving component 8 includes two sets of movable frames 801, driving screws 803 and a transmission component. The two sets of movable frames 801 are deflected and installed in the fan-shaped avoidance grooves opened at the top of the processing box 5. The two sets of installation sliders 802 are slidably installed in the corresponding movable frames 801. One end of the two sets of movable frames 801 close to the center of the machine tool is fixedly connected to the rotary ring 804 at the top of the processing box 5. The rotary ring 804 is driven to rotate by the adjustment component at the top of the processing box 5. The two sets of driving screws 803 are rotatably installed in the corresponding movable frames 801 and form a screw pair transmission with the corresponding installation sliders 802. The ends of the two sets of driving screws 803 are synchronously connected to the transmission component. In the present invention, by fixedly connecting the two sets of movable frames 801 to the rotary ring 804 at the center of the processing box 5, when the rotary ring 804 rotates, it can drive the two sets of movable frames 801 to move synchronously. At the same time, the two sets of driving screws 803 on the two sets of movable frames 801 are transmission-connected, so that when the two sets of driving screws 803 rotate synchronously, the corresponding installation sliders 802 in the movable frames 801 move synchronously, thereby ensuring that the milling component 11 and the polishing component 12 can perform corresponding processing on the same position of the corresponding bottom main reducer housing 4 at the same time, ensuring the synchronous processing efficiency of the milling component 11 and the polishing component 12, so that when the milling component 11 completes the milling process on a set of main reducer housings 4, the corresponding other polishing component 12 completes the processing operation on the other set of main reducer housings 4;

[0044] Further, the adjustment component includes a top transmission gear ring 806, a top driving gear 805 and a third motor 807. The top transmission gear ring 806 is coaxially installed outside the rotary ring 804. The top driving gear 805 is meshed and connected with the top transmission gear ring 806 and is driven to rotate by the third motor 807 at the top of the processing box 5. When driving the two sets of movable frames 801 to deflect in the present invention, while the third motor 807 is started to drive the top driving gear 805 to rotate, it meshes and drives the top transmission gear ring 806 and the rotary ring 804 to rotate;

[0045] Still further, the transmission component includes two sets of transmission shafts 811, transmission bevel gears 808, driving bevel gears 809 and a fourth motor 810. The two sets of transmission rods are coaxially and fixedly installed at the ends of the corresponding driving screws 803 and penetrate through the communication holes on the rotary ring 804. The two sets of transmission bevel gears 808 are coaxially and fixedly installed at the ends of the corresponding transmission shafts 811 and are meshed and transmitted with the driving bevel gear 809 rotatably installed in the rotary ring 804. Among them, the driving bevel gear 809 is driven to rotate by the fourth motor 810, so that while the fourth motor 810 drives the driving bevel gear 809 to rotate, it drives the two sets of transmission shafts 811 and the corresponding connected driving screws 803 to rotate through the meshing transmission of the two sets of transmission bevel gears 808.

[0046] AsFigure 2 and Figure 3 As shown in Figure 3 , in the embodiment of the present invention, the first telescopic assembly 9 includes a first telescopic rod 901, a first lifting block 903 and a first guide rod 902. The first telescopic rod 901 is fixedly installed on the corresponding installation slider 802. The first lifting block 903 is fixedly installed on the driving end face at the bottom of the first telescopic rod 901. The bottom of the first lifting block 903 is used to install the milling assembly 11. Multiple groups of first guide rods 902 are fixedly installed on the upper side end face of the first lifting block 903 and are slidably connected to the guide holes on the corresponding installation slider 802. And the second telescopic assembly 10 includes a second telescopic rod 1001, a second lifting block 1003 and a second guide rod 1002. The second telescopic rod 1001 is fixedly installed on the corresponding installation slider 802. The second lifting block 1003 is fixedly installed on the driving end face at the bottom of the second telescopic rod 1001. The bottom of the second lifting block 1003 is used to install the polishing assembly 12. Multiple groups of second guide rods 1002 are fixedly installed on the upper side end face of the second lifting block 1003 and are slidably connected to the guide holes on the corresponding installation slider 802. In the present invention, by rotating the corresponding first telescopic rod 901 and the second telescopic rod 1001, the corresponding milling assembly 11 and the polishing assembly 12 are driven to perform corresponding lifting. Among them, the milling assembly 11 and the polishing assembly 12 preferably adopt the prior art, and the present invention does not describe the specific structures of the milling assembly 11 and the polishing assembly 12.

[0047] To sum up, in the present invention, three processing bases 3 are evenly spaced on the rotary table 2 at the bottom of the machine tool. Each group of processing bases 3 can independently fix a main reducer housing 4. When processing the main reducer housing 4, when the rotary assembly 13 drives the rotary table 2 to intermittently rotate by 60°, during the processing, the processing personnel can sequentially place the main reducer housing 4 on the vacant processing base 3 outside the processing box 5, and the main reducer housing 4 located in the processing box 5 can perform milling and polishing operations, ensuring the continuity of the main reducer housing 4;

[0048] At the same time, the driving assembly 8 located at the upper end of the processing box 5 can drive the milling assembly 11 and the polishing assembly 12 to move synchronously, and move the milling assembly 11 and the polishing assembly 12 synchronously to the same processing positions of two main reducer housings 4, so that the two processing assemblies can synchronously complete the processing operations of the corresponding main reducer housings 4.

[0049] The above has described the preferred embodiments of the present invention in detail, but the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A method for processing a heavy-duty vehicle main reducer housing assembly, characterized in that: The method comprises the following steps: S1: placing a set of main reducer housings on a set of processing bases of a rotary table, and fixing the main reducer housings by a clamping assembly on the processing bases; S2: Control the partition door on the machine tool to open, and drive the rotary table to rotate 60° through the rotary assembly at the bottom of the machine tool base, rotate the processing base with the main reducer housing placed into the machine tool processing box, and then rotate it out of the processing box after being processed by the milling station and polishing station in sequence; S3: The driving assembly on the top of the processing box moves, synchronously driving the corresponding installed sliders on the milling station and the polishing station to deflect and move linearly, and the horizontal position of the milling assembly and the polishing assembly are adjusted accordingly. The first telescopic assembly drives the milling assembly to move vertically, and the second telescopic assembly drives the polishing assembly to move vertically, so as to perform milling and polishing processing on the main reducer housing on the milling station and the polishing station respectively.

2. The method for processing a heavy-duty vehicle main reducer housing assembly according to claim 1, characterized in that: The clamping assembly includes two groups of clamping blocks, a positioning slide block, a double-threaded rod and a first motor; Two groups of positioning slides are slidably installed in the limiting guide grooves opened on the processing base, and two groups of clamping blocks are fixedly installed on the corresponding positioning slides. The double-threaded rod is rotatably installed at the bottom of the processing base, and two groups of external threads are mirrored on both sides. The two groups of external threads and the corresponding positioning slides form a spiral pair transmission. The first motor is fixedly connected to one end of the double-threaded rod to drive the double-threaded rod to rotate.

3. The method for processing a heavy-duty vehicle main reducer housing assembly according to claim 1, characterized in that: The rotary assembly includes a rotary shaft, a bottom transmission gear ring, a bottom driving gear and a second motor; The rotary shaft is coaxially installed at the bottom of the turntable, the bottom transmission gear ring is coaxially installed on the outside of the rotary shaft, the bottom driving gear is meshed and connected with the bottom transmission gear ring, and is driven to rotate by the second motor at the bottom of the machine tool base.

4. The method for processing a heavy-duty vehicle main reducer housing assembly according to claim 1, characterized in that: There are two groups of partition doors, which are slidably installed at the openings on both sides of the processing box through multiple groups of positioning columns, and are driven to move vertically by driving cylinders at the upper ends of the openings.

5. The method for processing a heavy-duty vehicle main reducer housing assembly according to claim 1, characterized in that: The driving assembly includes two sets of movable frames, driving screws and transmission assemblies. The two sets of movable frames are rotatably installed in the fan-shaped avoidance grooves opened on the top of the processing box. The two sets of mounting slides are slidably installed in the corresponding movable frames. The ends of the two sets of movable frames close to the center of the machine tool are fixedly connected to the slewing ring on the top of the processing box. The slewing ring is driven to rotate by the adjusting assembly on the top of the processing box. The two sets of driving screws are rotatably installed in the corresponding movable frames and form a spiral pair transmission with the corresponding mounting slides. The ends of the two sets of driving screws are synchronously connected by the transmission assembly.

6. The method for processing a heavy-duty vehicle main reducer housing assembly according to claim 5, characterized in that: The adjustment assembly includes a top transmission gear ring, a top drive gear and a third motor; The top transmission gear ring is coaxially mounted on the outer side of the slewing ring, the top driving gear is meshedly connected with the top transmission gear ring, and is driven to rotate by the third motor on the top of the processing box.

7. The method for processing a heavy-duty vehicle main reducer housing assembly according to claim 6, characterized in that: The transmission assembly includes two sets of transmission shafts, a transmission bevel gear, a driving bevel gear and a fourth motor; The two groups of transmission rods are coaxially fixedly installed at the ends of the corresponding driving screws and pass through the connecting holes on the slewing ring. The two groups of transmission bevel gears are coaxially fixedly installed at the ends of the corresponding transmission shafts and mesh with the driving bevel gears rotatably installed in the slewing ring for transmission, wherein the driving bevel gears are driven to rotate by the fourth motor.

8. The method for processing a heavy-duty vehicle main reducer housing assembly according to claim 1, characterized in that: The first telescopic assembly includes a first telescopic rod, a first lifting block and a first guide rod; The first telescopic rod is fixedly mounted on the corresponding mounting slide block, the first lifting block is fixedly mounted on the driving end surface at the bottom of the first telescopic rod, the bottom of the first lifting block is used to install a milling assembly, and multiple groups of first guide rods are fixedly mounted on the upper end surface of the first lifting block and are slidably connected to the guide holes on the corresponding mounting slide block.

9. The method for processing a heavy-duty vehicle main reducer housing assembly according to claim 1, characterized in that: The second telescopic assembly includes a second telescopic rod, a second lifting block and a second guide rod; The second telescopic rod is fixedly mounted on the corresponding mounting slide block, the second lifting block is fixedly mounted on the driving end surface at the bottom of the second telescopic rod, the bottom of the second lifting block is used to install a polishing assembly, and multiple groups of second guide rods are fixedly mounted on the upper end surface of the second lifting block and are slidably connected to the guide holes on the corresponding mounting slide block.

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