Calibration device for truck scale gravity measurement

Abstract

The invention relates to the field of calibration, in particular to a calibration device for truck scale gravity measurement. The technical problems to be solved are that in a current test, due to differences of wheel track, wheel base, wheel set configuration and gravity center distribution of different vehicles, calibration of a truck scale becomes complex, changes of the wheel track, the wheel base and the gravity center influence pressure distribution and weighing precision, and a traditional calibration method cannot cover all vehicle types and load conditions. And the calibration data lacks diversity. A calibration device for automobile scale gravity measurement comprises a frame shaped like a Chinese character'hui ', two sliding strips are arranged on the frame shaped like a Chinese character'hui' in a sliding mode, two sliding blocks are arranged on each sliding strip in a sliding mode, and four lifting blocks are arranged on each sliding block in a sliding mode. By simulating the positions of vehicles with different wheel tracks and axle distances on the truck scale body, the performance of the truck scale is better tested, different vehicle requirements are flexibly met, operation is accurate and reliable, the test cost is remarkably reduced, and the vehicle scheduling complexity is reduced.

Description

Technical Field

[0001] The invention relates to the field of calibration, and in particular to a calibration device for gravity measurement of a vehicle scale. Background Art

[0002] A truck scale is a measuring device used to weigh the weight of a vehicle and its cargo, and is usually used in the fields of cargo transportation, logistics, trade, etc.

[0003] Truck scales require gravity calibration to ensure measurement accuracy, adapt to regional gravity differences, compensate for equipment errors, comply with regulatory standards, enhance customer trust, and cope with complex weighing conditions. Calibration can ensure that the measurement results of truck scales are accurate and reliable, extend the service life of the equipment, and reduce errors.

[0004] In the current testing process, due to the differences in wheelbases, wheelbases and wheel configurations of different vehicles, as well as the different distribution of the center of gravity of the vehicles, the calibration of the truck scale becomes complicated and challenging; different wheelbases and wheelbases will lead to different pressure distributions when the vehicle passes through the truck scale, and the change in the center of gravity of the vehicle will also affect the precision and accuracy of the weighing; due to these factors, traditional calibration methods may not be able to cover all possible vehicle types and load conditions, resulting in insufficient diversity of calibration data and an inability to effectively cope with all possible actual usage scenarios. Summary of the invention

[0005] In order to overcome the shortcomings of the current test, the calibration of the truck scale becomes complicated due to the differences in wheelbase, wheelbase, wheel configuration and center of gravity distribution of different vehicles. The changes in wheelbase, wheelbase and center of gravity will affect the pressure distribution and weighing accuracy. The traditional calibration method cannot cover all vehicle types and load conditions, resulting in a lack of diversity in the calibration data and an inability to cope with various actual scenarios. The technical problem to be solved is: to provide a calibration device for gravity measurement of a truck scale, which can simulate different vehicle configurations and center of gravity positions, thereby improving the calibration efficiency and adaptability of the truck scale and ensuring its measurement accuracy under various actual conditions.

[0006] The technical solution of the present invention is: a calibration device for gravity measurement of a vehicle scale, including a circular frame, two sliding bars are slidably provided on the circular frame, two sliding blocks are slidably provided on the two sliding bars, four lifting blocks are slidably provided on each sliding block, and a wheel is rotatably provided on each lifting block, a wheelbase adjustment mechanism is provided on the circular frame and the two sliding bars, and the wheelbase adjustment mechanism is used to adjust the wheelbase between the wheels, and a wheelbase adjustment mechanism is provided on the sliding bars and the sliding blocks, and the wheelbase adjustment mechanism is used to adjust the wheelbase between the wheels.

[0007] In one of the embodiments, each lifting block is provided with two limiting flanges, and the limiting flanges at the upper and lower parts of the lifting block are in contact with the bottom of the sliding block.

[0008] In one embodiment, four wheels on the same sliding block form a group.

[0009] In one of the embodiments, the wheelbase adjustment mechanism includes a fixed plate, a fixed plate is fixedly installed on the return frame, four horizontal hydraulic push rods are installed at the bottom of the fixed plate, the four horizontal hydraulic push rods are symmetrically arranged, and the telescopic rods of the four horizontal hydraulic push rods are respectively connected to the side of the two sliding bars close to each other.

[0010] In one of the embodiments, the wheelbase adjustment mechanism includes a bearing seat, two bearing seats are installed in the middle of two sliding bars, a threaded rod is rotatably provided between the two sides of each sliding bar and the two bearing seats in the middle of the sliding bar, and there are four threaded rods in total. A servo motor is installed on both sides of each sliding bar, and the output shafts of the four servo motors are respectively connected to one end of the four threaded rods. A nut is installed on the top of each of the four sliding blocks, and each nut is threadedly connected to each threaded rod.

[0011] In one embodiment, a trailer hook is also included, and a trailer hook is installed on one side of the return frame.

[0012] In one of the embodiments, vertical hydraulic push rods are also included. Four vertical hydraulic push rods are installed on the top of each sliding block, and the telescopic rods of each vertical hydraulic push rod are fixedly connected to the top of each lifting block.

[0013] In one of the embodiments, it also includes a center of gravity adjustment mechanism arranged on the fixed plate and the nut, the center of gravity adjustment mechanism is used to preliminarily adjust the position of the center of gravity of the device, the center of gravity adjustment mechanism includes a top frame, the top frame is installed on the upper part of the fixed plate, a rotating shaft is rotatably provided in the middle of the top frame, a gear is installed in the middle of the rotating shaft, a turntable is installed at the lower end of the rotating shaft, a roller is rotatably provided on the side of the bottom of the turntable away from the center of the circle, a sliding frame is slidably provided on the fixed plate, a straight groove frame is installed on the upper part of the sliding frame, a straight groove frame is opened on the straight groove frame, the roller is located in the straight groove on the straight groove frame, a counterweight frame is installed on the lower part of the sliding frame, the counterweight frame is located below the fixed plate, and a rack is fixedly installed between two nuts, and the rack is meshed with the gear.

[0014] In one of the embodiments, it also includes a secondary adjustment mechanism arranged on the fixed plate and the counterweight frame, the secondary adjustment mechanism is used to adjust the position of the center of gravity of the device again, the secondary adjustment mechanism includes a straight bevel slot frame, a straight bevel slot frame is fixedly installed on the bottom of the fixed plate, an inclined slot is opened on the straight bevel slot frame, a counterweight block is slidably provided in the counterweight frame, a rolling column is rotatably provided on the top of the counterweight block, and the rolling column is located in the inclined slot on the straight bevel slot frame.

[0015] The beneficial effects are: 1. By controlling the extension or shortening of the telescopic rods of the four horizontal hydraulic push rods, the two sets of wheels on the same sliding bar can be moved closer or farther away from each other, thereby realizing flexible adjustment of the wheelbase. At the same time, by starting the two servo motors located on different sliding bars to rotate forward or reverse synchronously, the eight wheels can be driven to move in the direction of approaching or moving away, thereby realizing precise adjustment of the wheelbase. It can not only simulate the position of vehicles with different wheelbases and wheelbases on the truck scale body to better test their performance, but also has the significant advantages of flexibly adapting to the needs of different vehicles, precise and reliable operation, significantly reducing testing costs and reducing the complexity of vehicle scheduling, as well as a wide range of applications.

[0016] 2. By controlling the extension or shortening of the telescopic rod 2 of the corresponding vertical hydraulic push rod, the telescopic rod 2 of the vertical hydraulic push rod pushes the lifting block and the wheel to move, so that the simulation of vehicles with different wheel group configurations can be more conveniently realized. This can improve the efficiency and accuracy of the calibration of the vehicle scale body, and different wheel group configurations can be quickly switched without changing the physical vehicle, which significantly reduces the complexity and cost of the test process and provides more comprehensive test conditions for testers.

[0017] 3. The rack drives the gear to rotate forward and backward, and the gear drives the shaft, turntable and roller to rotate forward and backward. The rotation of the roller drives the straight slot frame and the sliding frame to move back and forth on the fixed plate. The sliding frame further drives the counterweight frame to achieve synchronous reciprocating movement, thereby preliminarily adjusting the position of the counterweight frame on the fixed plate so as to flexibly adjust the center of gravity position of the entire device; it can efficiently simulate the changes in the center of gravity distribution of different vehicles when loading, which not only significantly improves the efficiency of the calibration of the vehicle scale body, but also increases the diversity of test scenarios.

[0018] 4. The counterweight block and the rolling column will move back and forth on the counterweight frame, thereby realizing secondary adjustment of the center of gravity position of the device; it can not only simulate the changes of the center of gravity position of different vehicles when loading more finely, but also restore the center of gravity distribution of the vehicle under complex load conditions more realistically, so that the range of change of the center of gravity position is wider, which can cover more practical application scenarios and improve the comprehensiveness and reliability of calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure when viewed from above of the present invention.

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the wheelbase adjustment mechanism and the wheelbase adjustment mechanism of the present invention.

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the wheelbase adjustment mechanism of the present invention.

[0023] Figure 5 The present invention is a schematic diagram of the disassembled structure of the return frame, the sliding bar, the sliding block, the lifting block, the wheel and some parts of the wheelbase adjustment mechanism.

[0024] Figure 6 It is a schematic diagram of the disassembled structure of some parts of the wheelbase adjustment mechanism of the present invention.

[0025] Figure 7 It is a schematic diagram of the three-dimensional structure of the sliding block, lifting block, wheels and vertical hydraulic push rod of the present invention.

[0026] Figure 8 It is a three-dimensional structural schematic diagram of the wheelbase adjustment mechanism, the wheelbase adjustment mechanism and the center of gravity adjustment mechanism of the present invention.

[0027] Fig. 9 It is a three-dimensional structural schematic diagram of the center of gravity adjustment mechanism and the secondary adjustment mechanism of the present invention.

[0028] Fig.10 It is a three-dimensional structural schematic diagram of the fixing plate and the straight inclined slot frame of the present invention.

[0029] Fig.11 It is a cross-sectional three-dimensional structural schematic diagram of the center of gravity adjustment mechanism and the secondary adjustment mechanism of the present invention.

[0030] Fig.12 It is a schematic diagram of the disassembled structure of some parts of the center of gravity adjustment mechanism and the secondary adjustment mechanism of the present invention.

[0031] In the accompanying drawings: 11-truck scale body, 1-return frame, 2-sliding bar, 3-sliding block, 4-lifting block, 5-wheel, 61-fixed plate, 62-horizontal hydraulic push rod, 71-bearing seat, 72-threaded rod, 73-servo motor, 74-nut, 21-trailer hook, 8-vertical hydraulic push rod, 91-top frame, 92-rotating shaft, 93-gear, 94-turntable, 95-roller, 96-sliding frame, 97-straight slot frame, 98-counterweight frame, 99-rack, 101-slotted slot frame, 102-counterweight block, 103-rolling column. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] Embodiment 1: A calibration device for vehicle scale gravity measurement, such as Figure 1-Figure 6As shown, it includes a return frame 1, two sliding bars 2 are slidably provided on the return frame 1, and the two sliding bars 2 will slide horizontally along the return frame 1, two sliding blocks 3 are slidably provided on the two sliding bars 2, and the sliding blocks 3 will slide along the sliding bars 2, and four lifting blocks 4 are slidably provided on each sliding block 3, and the lifting blocks 4 will slide up and down along the sliding blocks 3, and each lifting block 4 is provided with a wheel 5 rotatably through a bearing, and a wheelbase adjustment mechanism is provided on the return frame 1 and the two sliding bars 2, and the wheelbase adjustment mechanism is used to adjust the wheelbase between the wheels 5, and a wheelbase adjustment mechanism is provided on the sliding bars 2 and the sliding blocks 3, and the wheelbase adjustment mechanism is used to adjust the wheelbase between the wheels 5.

[0034] Two limit flanges are arranged on each lifting block 4 , and the limit flanges at the upper and lower parts of the lifting block 4 are in contact with the bottom of the sliding block 3 .

[0035] The four wheels 5 on the same sliding block 3 form a group.

[0036] The wheelbase adjustment mechanism includes a fixed plate 61, and a fixed plate 61 is fixedly installed on the return frame 1 by bolts. Four horizontal hydraulic push rods 62 are installed at the bottom of the fixed plate 61. The four horizontal hydraulic push rods 62 are symmetrically arranged, and the telescopic rods of the four horizontal hydraulic push rods 62 are respectively connected to the sides of the two sliding bars 2 that are close to each other.

[0037] The wheelbase adjustment mechanism includes a bearing seat 71. Two bearing seats 71 are installed in the middle of the two sliding bars 2. A threaded rod 72 is rotatably provided between the two sides of each sliding bar 2 and the two bearing seats 71 in the middle of the sliding bar 2 through bearings. There are four threaded rods 72 in total. A servo motor 73 is installed on both sides of each sliding bar 2. The output shafts of the four servo motors 73 are respectively connected to one end of the four threaded rods 72. A nut 74 is installed on the upper part of the four sliding blocks 3. Each nut 74 is respectively connected to each threaded rod 72 through a thread.

[0038] A trailer hook 21 is also included. A trailer hook 21 is installed on one side of the return frame 1.

[0039] When the truck scale body 11 is to be calibrated, the operator connects the trailer with the trailer through the trailer hook 21, and then drags the device to the truck scale body 11 through the trailer. Then the operator disconnects the trailer hook 21 from the trailer and drives the trailer away. The 16 wheels 5 on the device are in contact with the truck scale body 11. Then the operator controls the extension or shortening of the telescopic rods of the four horizontal hydraulic push rods 62. The telescopic rods of the horizontal hydraulic push rods 62 drive the two sliding bars 2 to move toward or away from each other, and the two sliding bars 2 drive the sliding blocks 3 and the lifting blocks 4 to move toward or away from each other, so that the two sliding bars 2 on the same sliding bar 2 can move. The two sets of wheels 5 move toward or away from each other, and the wheelbase between the wheels 5 can be adjusted, so that the position of vehicles with different wheelbases on the truck scale body 11 can be simulated; then the operator starts the output shafts of two servo motors 73 located on different sliding bars 2 and close to each other to rotate forward or reverse synchronously, and the output shafts of the two servo motors 73 drive the two threaded rods 72 to rotate forward or reverse synchronously, so that the two nuts 74 can be driven to move toward or away from the bearing seat 71 synchronously, and the two nuts 74 drive the two sliding blocks 3, the eight lifting blocks 4 and the eight wheels 5 to move toward or away from the other eight wheels synchronously. The two servo motors 73 are moved in the direction of the slider 5, so that the wheelbase between the wheels 5 can be adjusted. After adjusting to the appropriate wheelbase, the operator turns off the two servo motors 73, which can simulate the position of vehicles with different wheelbases on the truck scale body 11; by controlling the extension or shortening of the telescopic rods of the four horizontal hydraulic push rods 62, the two groups of wheels 5 located on the same slide bar 2 can be moved closer to or farther away from each other, thereby realizing flexible adjustment of the wheelbase. At the same time, by starting the output shafts of two servo motors 73 located on different slide bars 2 and close to each other to rotate forward or reverse synchronously, the eight wheels 5 can be driven to move synchronously in the direction of approaching or moving away from the other eight wheels 5, thereby realizing accurate adjustment of the wheelbase. The servo motor 73 and the horizontal hydraulic push rod 62 can be precisely controlled to ensure that the simulation process is highly accurate and the test results are more reliable. In addition, there is no need to use a variety of real vehicles for testing, which significantly reduces the test cost and the complexity of vehicle scheduling and maintenance. At the same time, it has a wide adaptability, which can cover the wheelbase and wheelbase range from small vehicles to heavy trucks, and provide comprehensive support for vehicle scale testing.

[0040] Embodiment 2: Based on embodiment 1, Figure 7 As shown, vertical hydraulic push rods 8 are also included. Four vertical hydraulic push rods 8 are installed on the top of each sliding block 3, and the telescopic rods 2 of each vertical hydraulic push rod 8 are fixedly connected to the top of each lifting block 4 respectively.

[0041] When it is necessary to simulate vehicles with different wheel configurations, the operator can control the extension or shortening of the telescopic rod 2 of the corresponding vertical hydraulic push rod 8 so that the telescopic rod 2 of the vertical hydraulic push rod 8 pushes the lifting block 4 and the wheel 5 to move, thereby more conveniently realizing the simulation of vehicles with different wheel configurations. This can improve the efficiency and accuracy of the calibration of the truck scale body 11, and can quickly switch between different wheel configurations without changing the physical vehicle, significantly reducing the complexity and cost of the test process and providing more comprehensive test conditions for testers.

[0042] Embodiment 3: Based on embodiment 2, Figure 8-Figure 12 As shown, it also includes a center of gravity adjustment mechanism arranged on the fixed plate 61 and the nut 74, and the center of gravity adjustment mechanism is used to preliminarily adjust the position of the center of gravity of the device. The center of gravity adjustment mechanism includes a top frame 91, and the top frame 91 is installed on the upper part of the fixed plate 61 by bolts. A rotating shaft 92 is rotatably provided in the middle of the top frame 91, and a gear 93 is installed in the middle of the rotating shaft 92 in a key connection manner. A turntable 94 is key-connected at the lower end of the rotating shaft 92, and a roller 95 is rotatably provided on the side of the bottom of the turntable 94 away from the center of the circle. A sliding frame 96 is slidably provided on the fixed plate 61, and a straight groove frame 97 is installed on the upper part of the sliding frame 96. The straight groove frame 97 has a straight groove, and the roller 95 is located in the straight groove on the straight groove frame 97. A counterweight frame 98 is installed at the lower part of the sliding frame 96, and the counterweight frame 98 is located below the fixed plate 61, wherein a rack 99 is fixedly installed between the two nuts 74, and the rack 99 is meshed with the gear 93.

[0043] It also includes a secondary adjustment mechanism arranged on the fixed plate 61 and the counterweight frame 98, and the secondary adjustment mechanism is used to adjust the position of the center of gravity of the device again. The secondary adjustment mechanism includes a straight bevel slot frame 101, and a straight bevel slot frame 101 is fixedly installed on the bottom of the fixed plate 61. The straight bevel slot frame 101 has an oblique slot. A counterweight block 102 is slidably provided in the counterweight frame 98, and a rolling column 103 is rotatably provided on the top of the counterweight block 102. The rolling column 103 is located in the oblique slot on the straight bevel slot frame 101.

[0044] When the counterweight frame 98 reciprocates on the fixed plate 61, it drives the counterweight block 102 and the rolling column 103 to move. Under the action of the inclined groove on the straight inclined groove frame 101, the counterweight block 102 and the rolling column 103 will reciprocate on the counterweight frame 98, thereby realizing secondary adjustment of the center of gravity position of the device; it can not only more finely simulate the changes in the center of gravity position of different vehicles when loading, but also more realistically restore the center of gravity distribution of vehicles under complex load conditions, so that the range of change of the center of gravity position is wider, which can cover more practical application scenarios and improve the comprehensiveness and reliability of calibration.

[0045] The two nuts 74 drive the reciprocating rack 99 to move back and forth when they move back and forth, and the rack 99 drives the gear 93 to rotate forward and reversely, and the gear 93 drives the rotating shaft 92, the turntable 94 and the roller 95 to rotate forward and reversely, and the rotation of the roller 95 drives the straight groove frame 97 and the sliding frame 96 to move back and forth on the fixed plate 61, and the sliding frame 96 further drives the counterweight frame 98 to achieve synchronous reciprocating movement, thereby preliminarily adjusting the position of the counterweight frame 98 on the fixed plate 61, so as to flexibly adjust the center of gravity position of the entire device; it can efficiently simulate the changes in the center of gravity distribution of different vehicles when loading, which not only significantly improves the efficiency of the calibration of the vehicle scale body 11, but also increases the diversity of test scenarios.

[0046] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A calibration device for vehicle scale gravity measurement, characterized in that: The invention comprises a return frame (1), two sliding bars (2) are slidably provided on the return frame (1), two sliding blocks (3) are slidably provided on the two sliding bars (2), four lifting blocks (4) are slidably provided on each sliding block (3), a wheel (5) is rotatably provided on each lifting block (4), a wheelbase adjustment mechanism is provided on the return frame (1) and the two sliding bars (2), the wheelbase adjustment mechanism is used to adjust the wheelbase between the wheels (5), and a wheelbase adjustment mechanism is provided on the sliding bars (2) and the sliding blocks (3), the wheelbase adjustment mechanism is used to adjust the wheelbase between the wheels (5).

2. A vehicle scale gravity measurement calibration device as claimed in claim 1, characterized in that: Each lifting block (4) is provided with two limit flanges, and the limit flanges at the upper and lower parts of the lifting block (4) are in contact with the bottom of the sliding block (3).

3. A vehicle scale gravity measurement calibration device as claimed in claim 1, characterized in that: The four wheels (5) on the same sliding block (3) form a group.

4. A vehicle scale gravity measurement calibration device as claimed in claim 1, characterized in that: The wheelbase adjustment mechanism comprises a fixed plate (61), a fixed plate (61) is fixedly mounted on the return frame (1), four horizontal hydraulic push rods (62) are mounted on the bottom of the fixed plate (61), the four horizontal hydraulic push rods (62) are symmetrically arranged, and telescopic rods of the four horizontal hydraulic push rods (62) are respectively connected to the sides of the two sliding bars (2) that are close to each other.

5. A vehicle scale gravity measurement calibration device as claimed in claim 4, characterized in that: The wheelbase adjustment mechanism comprises a bearing seat (71), two bearing seats (71) are installed in the middle of two sliding bars (2), a threaded rod (72) is rotatably provided between the two sides of each sliding bar (2) and the two bearing seats (71) in the middle of the sliding bar (2), and there are four threaded rods (72) in total, a servo motor (73) is installed on both sides of each sliding bar (2), the output shafts of the four servo motors (73) are respectively connected to one end of the four threaded rods (72), and a nut (74) is installed on the upper part of the four sliding blocks (3), and each nut (74) is respectively connected to each threaded rod (72) through a thread.

6. A vehicle scale gravity measurement calibration device as claimed in claim 5, characterized in that: It also includes a trailer hook (21), and a trailer hook (21) is installed on one side of the return frame (1).

7. A vehicle scale gravity measurement calibration device as claimed in claim 6, characterized in that: It also includes vertical hydraulic push rods (8). Four vertical hydraulic push rods (8) are installed on the top of each sliding block (3). The telescopic rods of each vertical hydraulic push rod (8) are respectively fixedly connected to the top of each lifting block (4).

8. A vehicle scale gravity measurement calibration device as claimed in claim 7, characterized in that: The device also includes a center of gravity adjustment mechanism disposed on the fixing plate (61) and the nut (74), the center of gravity adjustment mechanism being used for preliminarily adjusting the position of the center of gravity of the device, the center of gravity adjustment mechanism comprising a top frame (91), the top frame (91) being mounted on the top of the fixing plate (61), a rotating shaft (92) being rotatably mounted in the middle of the top frame (91), a gear (93) being mounted in the middle of the rotating shaft (92), a rotating disk (94) being mounted at the lower end of the rotating shaft (92), and a bottom of the rotating disk (94) being rotatably mounted on a side away from the center of the circle. A roller (95) is provided with a sliding frame (96) on the fixed plate (61) in a sliding manner. A straight groove frame (97) is installed on the upper part of the sliding frame (96). A straight groove is opened on the straight groove frame (97). The roller (95) is located in the straight groove on the straight groove frame (97). A counterweight frame (98) is installed on the lower part of the sliding frame (96). The counterweight frame (98) is located below the fixed plate (61). A rack (99) is fixedly installed between the two nuts (74), and the rack (99) is meshed with the gear (93).

9. A vehicle scale gravity measurement calibration device as claimed in claim 8, characterized in that: The device also includes a secondary adjustment mechanism disposed on the fixed plate (61) and the counterweight frame (98), the secondary adjustment mechanism being used to adjust the position of the center of gravity of the device again, the secondary adjustment mechanism comprising a straight-line inclined groove frame (101), a straight-line inclined groove frame (101) being fixedly mounted on the bottom of the fixed plate (61), a straight-line inclined groove frame (101) having an inclined groove, a counterweight block (102) being slidably disposed in the counterweight frame (98), a rolling column (103) being rotatably disposed on the top of the counterweight block (102), and the rolling column (103) being located in the inclined groove on the straight-line inclined groove frame (101).

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