Multi-axle balanced hovering automatic locking kingpin hydraulic puller

Abstract

The application provides a multi-shaft balanced hovering automatic locking kingpin hydraulic pulling machine, which can switch the operation according to the scene of kingpin installation or dismounting, and can quickly adapt to the corresponding position of the kingpin, so that the kingpin assembly of the front axle of the mine truck is convenient. It comprises a moving trolley, which comprises a bottom frame, four groups of load-bearing casters, a counterweight, a hydraulic pump station, a three-axis guide rail system comprising an X-axis guide rail, a Y-axis guide rail and a Z-axis guide rail, a Y-axis bottom plate, a Z-axis frame arranged vertically, a hydraulic cylinder assembly comprising a hydraulic cylinder, and a balanced lifting assembly comprising a balanced lifting device and a balanced lifting rope.

Description

Technical Field

[0001] This invention relates to the technical field of kingpin installation equipment, specifically a multi-axis balanced hovering automatic locking kingpin hydraulic traction machine. Background Technology

[0002] Currently, the steering front axles used in 186-216 ton mining trucks are generally of three types: 25-ton, 30-ton, and 35-ton. The kingpin structure of these three tonnage front axles is generally divided into two types: a split kingpin design and a one-piece kingpin design. The kingpin in the front axle assembly mainly mates with the front axle housing assembly and steering knuckle, and the interference fit is relatively large. The kingpin installation process is basically liquid nitrogen cold shrink assembly. After the kingpin is removed by liquid nitrogen freezing, its temperature will rise to a certain extent during assembly, causing the kingpin diameter to recover somewhat while also creating some resistance. Therefore, external force is required when the kingpin is cold-installed with liquid nitrogen.

[0003] Without sufficient external force, if the assembly process becomes prolonged and the parts are not yet properly installed, the kingpin diameter recovery rate will be high, resulting in significant resistance in the pin hole fit. At this point, the kingpin will become stuck, and conventional manual hammering or low-tonnage hydraulic presses will be insufficient to press it into place. Since the front axle housing and steering knuckle of a mining truck are large parts, they cannot be scrapped simply because the kingpin is stuck. Therefore, a high-tonnage hydraulic press must be used to press the kingpin into place or remove it, followed by re-freezing and reassembly.

[0004] However, existing large-tonnage hydraulic presses are all fixed-position hydraulic presses. When installing the kingpin, the front axle assembly, front axle housing assembly, steering knuckle, and kingpin to be installed need to be placed on the fixed hydraulic press for installation or disassembly. This limits the space for kingpin installation or disassembly, making it unsuitable for assembly operations in various situations and greatly restricting the convenience of kingpin installation and disassembly. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a multi-axis balanced hovering and automatic locking kingpin hydraulic traction machine, which can switch between moving operations according to the kingpin installation or disassembly scenario, and can quickly adapt to the corresponding position of the kingpin, making the assembly of the kingpin of the mining truck front axle convenient and easy.

[0006] A multi-axis balanced hovering and automatic locking kingpin hydraulic traction machine, characterized in that it comprises: The mobile trolley includes a bottom frame and four sets of load-bearing casters; Counterweight; Hydraulic pump station; A three-axis guide rail system, which includes an X-axis guide rail, a Y-axis guide rail, and a Z-axis guide rail; Y-axis base plate; The Z-axis frame is vertically arranged. A hydraulic cylinder assembly, which includes a hydraulic cylinder; And a balancer assembly, including the balancer and the balancer rope; The upper surface of one end of the bottom frame along its length is provided with a counterweight and a hydraulic pump station. The upper surface of the other end of the bottom frame along its long side is provided with an X-axis guide rail. The bottom sides of the Y-axis base plate are supported on the X-axis guide rail by X-axis sliders. The upper surface of the Y-axis base plate is provided with two sets of parallel Y-axis guide rails. The bottom of the Z-axis frame is supported on the Y-axis guide rail by Y-axis sliders. The Z-axis frame is vertically arranged. The outer surfaces of the two uprights of the Z-axis frame are provided with the Z-axis guide rails. The hydraulic cylinder assembly is connected to the Z-axis guide rails through the Z-axis sliders. The balance hanger is mounted on the Z-axis frame. The balance hanger's extended balance hanger rope is fixed to the hydraulic cylinder assembly. The pushing and pulling speed and working pressure of the hydraulic cylinder are adjusted by the speed control valve and flow valve of the hydraulic pump station.

[0007] Its further features are: The bottom frame is formed into a rectangular frame structure by welding profiles; The Y-axis base plate is provided with an X-axis air cut-off braking system relative to one long side of the bottom frame. The bottom of the Z-axis frame is provided with a Y-axis air cut-off braking system relative to the upper surface of the Y-axis base plate. The hydraulic cylinder mounting base plate of the hydraulic cylinder assembly is provided with a Z-axis air cut-off braking system relative to one of the columns of the Z-axis frame. The X-axis air cut-off braking system, Y-axis air cut-off braking system, and Z-axis air cut-off braking system are all connected to a push-button type 2-position 5-way manual valve. The X-axis, Y-axis, and Z-axis air-stop braking systems are all the same model of air-stop braking system. Their core component is the air-stop braking cylinder, which contains a powerful spring. When the air-stop braking cylinder is not vented, the powerful spring pushes out the cylinder push rod. The push rod head has a circular brake block. The circular brake block rubs against the surface of the frame and the machine frame to generate braking torque. The braking force of a single air-stop braking cylinder is 20 kg or more, which is sufficient to lock the X / Y / Z axes. When compressed air is introduced into the cylinder through the air inlet, the cylinder piston compresses the powerful spring and contracts, causing the pushed cylinder push rod to retract and the brake to be released. A rectangular handle frame is provided on one side of the hydraulic mounting base plate. The 2-position 5-way manual valve is installed in the thumb pressing area of ​​the rectangular handle frame. The 2-position 5-way manual valve is used to control the air supply and exhaust of the air-stop brake cylinder of the three-axis air-stop brake system. When it is necessary to change the X / Y / Z axial position of the hydraulic cylinder, hold the rectangular handle frame and press the button of the 2-position 5-way manual valve with your thumb. At this time, the three-axis air-stop brake system is vented and the brake is engaged, so the hydraulic cylinder can be manually driven to any position. After the hydraulic cylinder reaches the expected position, release the 2-position 5-way manual valve with your thumb and release the rectangular handle frame with your palm. At this time, the X / Y / Z axis is braked, so that the hydraulic cylinder is in the expected position, realizing one-handed operation of moving and locking the X / Y / Z axis. The hydraulic cylinder assembly includes a hydraulic cylinder and a hydraulic cylinder mounting base plate. The lower end of the bending support at both ends of the hydraulic cylinder mounting base plate in the height direction is bent and equipped with an angle adjustment bracket. The hydraulic cylinder is installed at the mounting positions of the bending support at both ends of the hydraulic cylinder mounting base plate by fastening bolts. The angle adjustment bracket makes the angle of the hydraulic cylinder adjustable. A fixed pulley is provided on the top inner side of the Z-axis frame, and a horizontal hanger for a balance hanger is fixed on the upper part of the Z-axis frame. The balance hanger is installed downwards, and the balance hook of the balance hanger is hung in the reserved hole of the balance hanger hanger. The balance hanger rope passes through the fixed pulley, changes direction, and hangs the hydraulic cylinder assembly as a whole downwards. The fixed pulley allows the useful stroke of the balance suspension at the Z-axis position to be maximized when the height of the Z-axis frame is fixed. Combined with the Z-axis air cut-off brake system, the hydraulic cylinder assembly can be manually moved up and down and suspended and locked under zero gravity. The load-bearing casters are specifically double spring casters. The left and right sides of the mobile trolley are each pivotally connected to a set of anti-tilting support rods, and the ends of the rods are provided with spring unloading structures. A protruding push rod is welded to one end of the bottom frame along its length. The push rod is used to push the cart. An interface is reserved on the top of the bottom frame for installing a hydraulic pump station. Interfaces are machined on both long sides of the bottom frame for installing two X-axis guide rails. To prevent the risk of tipping over due to the large overall mass of the hydraulic cylinder system and the Z-axis frame, a counterweight is fixed in the area between the hydraulic pump station and the push rod. The counterweight is fixed by a pressure rod and bolts.

[0008] With this invention, when the kingpin needs to be installed or removed, the entire hydraulic tractor is moved to the corresponding installation area of ​​the kingpin. Then, the hydraulic cylinder is moved to the corresponding installation or removal position of the kingpin through the three-axis guide rail system. After that, the hydraulic cylinder is driven by the hydraulic pump station to complete the installation or removal operation of the kingpin. It can move and switch operations according to the kingpin installation or removal scenario and can quickly adapt to the corresponding position of the kingpin, making the assembly of the kingpin of the mining truck front axle convenient and easy. Attached Figure Description

[0009] Figure 1 The three-dimensional representation of the present invention Figure 1 (The left anti-roll support system is in the open position); Figure 2 The three-dimensional representation of the present invention Figure 2 ; Figure 3 for Figure 1 Top view; Figure 4 for Figure 1 The main view; Figure 5 for Figure 1 Side view; Figure 6 A perspective view of the air-stop braking system applicable to the present invention; Figure 7 for Figure 6 Front sectional view; Figure 8 This is a cross-sectional view of the hydraulic cylinder of the present invention acting on the kingpin. Detailed Implementation

[0010] A multi-axis balanced hovering and automatic locking kingpin hydraulic traction machine, see Figures 1-7 It includes a mobile trolley 10, a counterweight 20, a hydraulic pump station 30, a three-axis guide rail system 40, a Y-axis base plate 50, a Z-axis frame 60, a hydraulic cylinder assembly 70, and a balance crane assembly 80. The mobile trolley 10 includes a bottom frame 11 and four sets of load-bearing casters 12; the three-axis guide rail system 40 includes an X-axis guide rail 41, a Y-axis guide rail 42, and a Z-axis guide rail 43; the Z-axis frame 60 is arranged vertically; the hydraulic cylinder assembly 70 includes a hydraulic cylinder 71; and the balance hoist assembly 80 includes a balance hoist 81 and a balance hoist rope 82. A counterweight 20 and a hydraulic pump station 30 are provided on the upper surface of one end of the bottom frame 11 along its length. An X-axis guide rail 41 is arranged along the upper surface of the other end of the bottom frame 11 along its long side. The bottom sides of the Y-axis base plate 50 are supported on the X-axis guide rail 41 by X-axis sliders 51. Two sets of parallel Y-axis guide rails 42 are provided on the upper surface of the Y-axis base plate 50. The bottom of the Z-axis frame 60 is supported on the Y-axis guide rail 42 by Y-axis sliders 61. Z-axis guide rails 43 are provided on the outer surfaces of the uprights on both sides of the Z-axis frame 60. The hydraulic cylinder assembly 70 is connected to the Z-axis guide rail 43 by the Z-axis slider. The balance crane 81 is hung on the Z-axis frame 60. The balance crane rope 82 extending from the balance crane 81 is fixed to the hydraulic cylinder assembly 70. The hydraulic pump station 30 is connected to the hydraulic cylinder 71 through pipelines. The pushing and pulling speed and working pressure of the hydraulic cylinder 71 are adjusted by the speed regulating valve and flow valve of the hydraulic pump station 30.

[0011] In practice, the bottom frame 11 is formed into a rectangular frame structure by welding profiles; The Y-axis base plate 50 is provided with an X-axis air cut-off brake system 1 on one long side of the bottom frame 11. The bottom of the Z-axis frame 60 is provided with a Y-axis air cut-off brake system 2 on the upper surface of the Y-axis base plate 50. The hydraulic cylinder mounting base plate 72 of the hydraulic cylinder assembly 70 is provided with a Z-axis air cut-off brake system 3 on one of the columns of the Z-axis frame 60. The X-axis air cut-off brake system 1, the Y-axis air cut-off brake system 2, and the Z-axis air cut-off brake system 3 are all connected to a push-type 2-position 5-way manual valve 4. The X-axis air-stop brake system 1, Y-axis air-stop brake system 2, and Z-axis air-stop brake system 3 are all the same model of air-stop brake system. Their core component is the air-stop brake cylinder 90. The air-stop brake cylinder 90 contains a powerful spring 91. When the air-stop brake cylinder 90 is not ventilated, the powerful spring 91 pushes out the cylinder push rod 92. The head of the cylinder push rod 92 has a circular brake block 93. The circular brake block 93 rubs against the surface of the frame and frame to generate braking torque. The braking force of a single air-stop brake cylinder 90 is 20 kg or more, which is sufficient to lock the X / Y / Z axes. When compressed air is injected into the cylinder through the air inlet 94, the cylinder piston 95 compresses the powerful spring 91 and contracts, the pushed-out cylinder push rod 92 retracts, and the brake is released. A rectangular handle frame 721 is provided on one side of the hydraulic mounting base plate 72. A 2-position 5-way manual valve 4 is installed in the thumb pressing area of ​​the rectangular handle frame 721. The 2-position 5-way manual valve 4 is used to control the air supply and exhaust of the air-stop brake cylinder 90 of the three-axis air-stop brake system. When it is necessary to change the X / Y / Z axial position of the hydraulic cylinder 71, hold the rectangular handle frame 721 and press the button of the 2-position 5-way manual valve 4 with your thumb. At this time, the three-axis air-stop brake system is vented and the brake is engaged, so the hydraulic cylinder can be manually driven to any position. After the hydraulic cylinder 71 reaches the expected position, release the 2-position 5-way manual valve 4 with your thumb and release the rectangular handle frame 721 with your palm. At this time, the X / Y / Z axis is braked, so that the hydraulic cylinder 71 is in the expected position, realizing one-handed operation of moving and locking the X / Y / Z axis. The hydraulic cylinder assembly 70 includes a hydraulic cylinder 71 and a hydraulic cylinder mounting base plate 72. The lower ends of the bending supports at both ends of the hydraulic cylinder mounting base plate 72 in the height direction are bent and provided with tilt angle adjustment brackets 722. The hydraulic cylinder 71 is installed at the mounting positions of the bending supports at both ends of the hydraulic cylinder mounting base plate by fastening bolts. The tilt angle adjustment brackets 722 make the tilt angle of the hydraulic cylinder adjustable. A fixed pulley 5 is provided on the inner side of the top of the Z-axis frame 60. A balance hanger 6 is fixed on the upper part of the Z-axis frame 60. The balance hanger 81 is installed downwards, and the balance hanger hook 83 of the balance hanger 81 is hung in the reserved hole of the balance hanger 6. The balance hanger rope 82 of the balance hanger 81 passes through the fixed pulley 5, changes direction, and hangs the hydraulic cylinder assembly 70 as a whole downwards. The fixed pulley 5 allows the useful stroke of the balance suspension 81 at the Z-axis position to be maximized when the height of the Z-axis frame 60 is fixed. Combined with the Z-axis air cut-off brake system 3, the hydraulic cylinder assembly 70 can be manually moved up and down and suspended and locked under zero gravity. The load-bearing caster 12 is specifically a double spring caster. The left and right sides of the mobile trolley 10 are each pivotally connected to a set of anti-tilting support rods 13. The ends of the anti-tilting support rods 13 are provided with spring unloading structures 14. A protruding push rod 15 is welded to one end of the bottom frame 11 along its length. The push rod 15 is used to push the cart. An interface is reserved on the top of the bottom frame 11 for installing the hydraulic pump station 30. Interfaces are machined on the two long sides of the bottom frame 11 for installing two X-axis guide rails 41. To prevent the risk of tipping over due to the large overall mass of the hydraulic cylinder assembly 70 and the Z-axis frame 11, a counterweight 20 is fixed in the area between the hydraulic pump station 30 and the push rod 15. The counterweight 20 is fixed by a pressure rod and bolts. In specific implementation, the counterweight 20 consists of three sets of metal counterweights.

[0012] In a specific embodiment, the hydraulic cylinder 71 is a 200-stroke hollow 100-ton hydraulic cylinder with a hollow diameter of φ78 and a matching master pin 02 / 03 diameter of φ75. The hydraulic pump station 30 is specifically a 3KW dual-circuit high-pressure hydraulic pump station with a rated oil pressure of 70Mpa.

[0013] When the cylinder brake system with air cut-off braking function is filled with compressed air of 0.3 MPa or above, the braking force is eliminated, and the three-axis platform can be moved manually. After the hydraulic cylinder 71 is moved to the required working position, the compressed air of the brake cylinder is cut off by the 2-position 5-way manual valve 4, and the braking force is generated, which automatically locks the hydraulic cylinder 71 in the working position. The air cut-off locking function can ensure that the hydraulic cylinder 71 will not slip or fall in extreme cases such as air circuit system failure. The hydraulic cylinder assembly 70 weighs 95 kg, so the balance crane 81 is a heavy-duty balance crane weighing 80-100 kg. Through the fixed pulley 5 and the Z-axis air cut-off brake system 3, the hydraulic cylinder assembly 70 with a weight of 95 kg can achieve zero-gravity manual up and down movement and automatic suspension locking. Since the maximum pressure of the hydraulic cylinder 71 when pulling or pushing is 100 tons, which is several orders of magnitude greater than the maximum rigidity and load-bearing capacity of the mobile trolley 10 and the three-axis guide rail system 40, a force-relieving mechanism is required for the mobile trolley 10 and the three-axis guide rail system 40. The solution is to install four double-spring caster assemblies with a rated load of 70 kg under the mobile trolley 10, taking into account the total mass of about 250 kg. That is, the maximum load on the mobile trolley 10 and the three-axis guide rail system 40 will not exceed 280 kg, which is well within the bearing capacity. In addition, each side of the mobile trolley 10 is pivotally connected to a set of anti-tilting support rods 13, and the rods are also equipped with spring force-relieving structures 14.

[0014] For specific instructions, see Figure 8 For the upper master pin A to be pulled out for repair, an M27 process bolt C is screwed in beforehand. By pushing and pulling the position of the moving trolley 10 and the three-axis guide rail system 40, the lower end face E of the hydraulic cylinder is brought into contact with the upper truncated cone surface F of the front axle housing. A clamping plate G is placed above the hydraulic cylinder. High-pressure hydraulic oil enters the hydraulic cylinder inlet H from the outlet end of the hydraulic pump station through the high-pressure oil pipe, pushing the hydraulic cylinder piston push rod assembly I upward. Since the diameter of the hollow cavity φ78 of the hydraulic cylinder is larger than the diameter of the master pin φ75, it can accommodate the master pin. Moreover, the stroke of the hydraulic cylinder 71 200 is sufficient. Finally, the piston push rod assembly I pulls the upper master pin A out of the pin hole of the front axle housing through the clamping plate G and the process bolt C. The pulling principle of the lower master pin B and the integrated upper and lower master pins is the same as that of the upper master pin A. After the master pin pulling operation is completed, the hydraulic cylinder piston push rod assembly I is retracted and reset through the reversing valve of the hydraulic pump station. In the figure, serial number D is the front axle housing assembly, and J is the hydraulic cylinder outlet.

[0015] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0016] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-axis balanced hovering and automatic locking kingpin hydraulic pulling machine, characterized in that, It includes: The mobile trolley includes a bottom frame and four sets of load-bearing casters; Counterweight; Hydraulic pump station; A three-axis guide rail system, which includes an X-axis guide rail, a Y-axis guide rail, and a Z-axis guide rail; Y-axis base plate; The Z-axis frame is vertically arranged. A hydraulic cylinder assembly, which includes a hydraulic cylinder; And a balancer assembly, including the balancer and the balancer rope; The upper surface of one end of the bottom frame along its length is provided with a counterweight and a hydraulic pump station. The upper surface of the other end of the bottom frame along its long side is provided with an X-axis guide rail. The bottom sides of the Y-axis base plate are supported on the X-axis guide rail by X-axis sliders. The upper surface of the Y-axis base plate is provided with two sets of parallel Y-axis guide rails. The bottom of the Z-axis frame is supported on the Y-axis guide rail by Y-axis sliders. The Z-axis frame is vertically arranged. The outer surfaces of the two uprights of the Z-axis frame are provided with the Z-axis guide rails. The hydraulic cylinder assembly is connected to the Z-axis guide rails through the Z-axis sliders. The balance hanger is mounted on the Z-axis frame. The balance hanger's extended balance hanger rope is fixed to the hydraulic cylinder assembly. The pushing and pulling speed and working pressure of the hydraulic cylinder are adjusted by the speed control valve and flow valve of the hydraulic pump station.

2. The multi-axis balanced suspension automatic locking kingpin hydraulic traction machine according to claim 1, characterized in that: The bottom frame is formed into a rectangular frame structure by welding profiles.

3. The multi-axis balanced suspension automatic locking kingpin hydraulic traction machine according to claim 2, characterized in that: An X-axis air cut-off braking system is provided on the Y-axis base plate relative to one long side of the bottom frame. A Y-axis air cut-off braking system is provided on the bottom of the Z-axis frame relative to the upper surface of the Y-axis base plate. A Z-axis air cut-off braking system is provided on the hydraulic cylinder mounting base plate of the hydraulic cylinder assembly relative to one of the columns of the Z-axis frame. The X-axis air cut-off braking system, Y-axis air cut-off braking system, and Z-axis air cut-off braking system are all connected to a push-button type 2-position 5-way manual valve.

4. The multi-axis balanced hovering automatic locking kingpin hydraulic traction machine according to claim 3, characterized in that: The X-axis, Y-axis, and Z-axis air-stop braking systems are all the same model of air-stop braking system. Their core component is the air-stop braking cylinder, which contains a powerful spring. When the air-stop braking cylinder is not ventilated, the powerful spring pushes the cylinder push rod out. The push rod head has a circular brake block. The friction between the circular brake block and the surface of the frame generates braking torque.

5. The multi-axis balanced suspension automatic locking kingpin hydraulic traction machine according to claim 4, characterized in that: A rectangular handle frame is provided on one side of the hydraulic mounting base plate. The 2-position 5-way manual valve is installed in the thumb pressing area of ​​the rectangular handle frame. The 2-position 5-way manual valve is used to control the air supply and exhaust of the air-stop brake cylinder of the triaxial air-stop brake system. When it is necessary to change the X / Y / Z axial position of the hydraulic cylinder, hold the rectangular handle frame and press the button of the 2-position 5-way manual valve with your thumb. At this time, the triaxial air-stop brake system is vented and the brake is engaged, so the hydraulic cylinder can be manually driven to any position. After the hydraulic cylinder reaches the expected position, release the 2-position 5-way manual valve with your thumb and release the rectangular handle frame with your palm. At this time, the X / Y / Z axis is braked, and the hydraulic cylinder is in the expected position, realizing one-handed operation of X / Y / Z axis movement and locking.

6. The multi-axis balanced hovering automatic locking kingpin hydraulic traction machine according to claim 1, characterized in that: The hydraulic cylinder assembly includes a hydraulic cylinder and a hydraulic cylinder mounting base plate. The lower ends of the bending supports at both ends of the hydraulic cylinder mounting base plate in the height direction are provided with tilt adjustment brackets. The hydraulic cylinder is installed at the mounting positions of the bending supports at both ends of the hydraulic cylinder mounting base plate by fastening bolts. The tilt adjustment brackets make the tilt angle of the hydraulic cylinder adjustable.

7. The multi-axis balanced hovering automatic locking kingpin hydraulic traction machine according to claim 1, characterized in that: A fixed pulley is provided on the top inner side of the Z-axis frame, and a horizontal hanger for a balance hanger is fixed on the upper part of the Z-axis frame. The balance hanger is installed facing downwards, and the balance hook of the balance hanger is hung in the reserved hole of the balance hanger hanger. The balance hanger rope passes through the fixed pulley, changes direction, and hangs the hydraulic cylinder assembly as a whole downwards.

8. The multi-axis balanced hovering automatic locking kingpin hydraulic traction machine according to claim 1, characterized in that: The load-bearing casters are specifically double-spring casters. Each side of the mobile trolley is pivotally connected to a set of anti-tilting support rods, and the ends of the rods are provided with spring unloading structures.

9. The multi-axis balanced hovering automatic locking kingpin hydraulic traction machine according to claim 1, characterized in that: A protruding push rod is welded to one end of the bottom frame along its length. The push rod is used to push the cart. An interface is reserved on the top of the bottom frame for installing a hydraulic pump station. Interfaces are machined on both long sides of the bottom frame for installing two X-axis guide rails. To prevent the risk of tipping over due to the large overall mass of the hydraulic cylinder system and the Z-axis frame, a counterweight is fixed in the area between the hydraulic pump station and the push rod. The counterweight is fixed by a pressure rod and bolts.

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