Automatically-driven wheel rolling test device for rutting instrument

Abstract

The utility model discloses an automatically-driven wheel rolling test device for a rutting instrument, which comprises a support frame and two cross beams positioned at the top of the support frame, the bottoms of the two cross beams are fixedly connected with sliding rails, each sliding rail is connected with at least one sliding block in a sliding manner, the bottom ends of the plurality of sliding blocks are jointly provided with a mounting plate, and the mounting plate is fixedly connected with the support frame. And an air cylinder is mounted on the mounting plate. The pneumatic mechanism is matched with the proportional valve to pressurize the air cylinder, the pressure sensor responds to numerical values to accurately measure load pressure, the purpose of accurately controlling the load pressure is achieved, the driving part drives the mounting plate to reciprocate, wheel rolling movement can be automatically circulated, manual work is not needed, and the rut forming process is simulated. Load pressure is accurately measured by matching with a pressure sensor and a display reaction value, the wheel pressure range is improved, the displacement of the experimental wheel can meet the control of distance and speed change, the controllability of the test is greatly improved, and the accuracy of a test result can be ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of wheel rolling tests, and particularly relates to a rutting meter wheel rolling test device driven automatically. Background Art

[0002] In the fields of materials science, civil engineering, geological engineering, etc., the wheel rolling test is a commonly used test method for simulating the mechanical behavior of materials during the compaction process. The rutting meter is a classic mechanical model that realizes the motion function by driving the wheel to rotate. It has the advantages of low energy consumption and convenient operation. By simulating the actual running conditions of the tire on the road surface, it can accurately measure and record the deformation of the road surface under different loads and speeds, and can provide a scientific basis for evaluating the rutting disease of the road surface.

[0003] The wheel rolling motion of the traditional rutting meter often relies on a transmission device to achieve, such as gear transmission or chain transmission. These traditional transmission methods have problems such as low transmission efficiency, high noise, and easy damage. In addition, the current rutting meter also has the following defects during the wheel rolling test:

[0004] (1) Relying on the rutting plate device at the bottom to perform the back-and-forth circular motion of the test piece or performing eccentric shaft connecting rod transmission, without mentioning the form of loading. Therefore, when the loading pressure is large, the resulting failure rate is also high;

[0005] (2) The wheel pressure range of the conventional instrument is 0.7 MPa to 1.4 MPa. Usually, methods such as loading weights, gear connecting rod transmission, and hydraulic pressurization are used to drive the displacement of the test wheel. However, these methods all need to calculate the actual wheel pressure per unit area through printing paper, which is cumbersome to operate and difficult to guarantee the accuracy. In addition, the dynamic loading capabilities of these methods are limited, increasing the complexity of the operation and possibly introducing human errors. In contrast, although the hydraulic system can provide higher pressure and more stable loading, its structure is complex, involving multiple components such as pumps, valves, and cylinders, and there are more fault points. The hydraulic system also has a risk of oil leakage, which may contaminate the specimen and the environment. More critically, the performance of the hydraulic oil is greatly affected by temperature, and temperature changes may cause pressure instability, thus affecting the accuracy of the test results;

[0006] (3) The conventional instrument uses a crank connecting rod drive, and the connecting rod drives the working components to perform reciprocating or rotary motion. The simplicity of this structure gives it an advantage in some application scenarios, but the motion speed usually generates acceleration changes, which are set to be fixed and non-adjustable, so the uniform experimental effect cannot be achieved.

[0007] Therefore, it is very necessary to invent an automatically driven rutting meter wheel rolling test device. Content of the Utility Model

[0008] Technical problem to be solved: In view of the above technical problems, the utility model provides an automated-driven rutting tester wheel rolling test device to overcome the technical defects existing in actual use as proposed in the background art.

[0009] To achieve the above object, the utility model adopts the following technical solutions:

[0010] An automated-driven rutting tester wheel rolling test device includes a support frame and two cross beams located at the top of the support frame. Both bottoms of the two cross beams are fixedly connected with slide rails, and at least one slider is slidably connected to each slide rail. The bottoms of multiple sliders are jointly provided with a mounting plate. A cylinder is mounted on the mounting plate, and a pneumatic mechanism for providing kinetic energy to the cylinder is provided at the connecting end of the cylinder. A limit fixing frame is also provided outside the cylinder.

[0011] The output end of the cylinder is drivingly connected with a bearing rod, and a pressure sensor is mounted at the bottom end of the bearing rod.

[0012] At least two through holes are formed in the mounting plate, and guide rods are slidably connected inside the through holes. The bottoms of multiple guide rods are jointly connected with an experimental wheel assembly.

[0013] A driving part is arranged on one side of the support frame, and the output end of the driving part is drivingly connected with the mounting plate.

[0014] Preferably, the driving part is set as an electric push rod, and the output end of the electric push rod is combined and installed with the mounting plate.

[0015] Preferably, the experimental wheel assembly includes a traveling wheel and a wheel plate frame. The traveling wheel is rotationally connected inside the wheel plate frame through a rotating shaft, and a first groove matching the bottom end of the guide rod is formed on the upper surface of the wheel plate frame.

[0016] A second groove is formed at the bottom end of the guide rod, and a first pin hole penetrating through the second groove is formed on the side wall of the guide rod. A second pin shaft penetrates through the upper surface of the wheel plate frame, and a second pin hole is formed on the side wall of the second pin shaft. The top end of the second pin shaft matches the second groove, and a pin is inserted into the first pin hole and the second pin hole after they correspond to each other.

[0017] Preferably, the output end of the cylinder penetrates through the mounting plate and is in sliding fit with the through hole. A damping spring is sleeved outside the bearing rod and between the mounting plate and the bearing rod.

[0018] Preferably, the slider and the mounting plate are detachably installed by screws, and the lower surfaces of multiple sliders are flush, so that the mounting plate is horizontally arranged.

[0019] Multiple through holes are uniformly distributed on both sides of the upper surface of the mounting plate, and multiple through holes are symmetrically distributed about the midline of the limit fixing frame.

[0020] A guide sleeve is detachably installed below the mounting plate through screws. The guide sleeves correspond to the through holes one by one and are coaxially distributed, and the guide rods are slidably connected to the guide sleeves.

[0021] Preferably, the limit fixing frame is set as a table-type structure composed of support rods and a pressing plate. The number of support rods is set to four. Screw holes corresponding to the support rods one by one are provided on the top surface of the mounting plate and at the four corners of the pressing plate, and external threads matching the screw holes are respectively provided at both ends of the outer side of the support rods.

[0022] Preferably, a gap is reserved between the two cross beams, and the width of the gap is greater than the width of the combination structure of the limit fixing frame and the cylinder, so that the cylinder can move in the gap.

[0023] Preferably, a proportional valve is provided at the input end of the cylinder to throttle and control the input flow of the cylinder in an electric control manner;

[0024] On the side of the slider located at the end away from the driving part, it extends out of the mounting plate, and a travel switch is installed on the side wall of the slider extending out of the mounting plate. The connection end of the travel switch is electrically connected to a controller. A display is also provided at the connection end of the controller. The controller is used to receive the feedback signals of the travel switch and the pressure sensor, and the controller controls the start / stop of the servo motor according to the feedback signal of the travel switch. The feedback signal of the pressure sensor is displayed in real time on the display, and the controller is also used to control the opening of the proportional valve.

[0025] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0026] 1. This device uses a pneumatic mechanism to cooperate with a proportional valve to pressurize the cylinder. The pressure sensor accurately measures the load pressure by reacting the value, achieving the purpose of accurately controlling the load pressure. The mounting plate is driven by the driving part to reciprocate, and the wheel rolling movement can be automatically cycled without manual operation, simulating the process of rut formation. Cooperating with the pressure sensor and the display to accurately measure the load pressure by reacting the value, the wheel pressure range is increased, and the displacement of the test wheel can meet the control of distance and speed changes, greatly improving the controllability of the test and ensuring the accuracy of the test results;

[0027] 2. This device has versatility and can meet the requirements of different wheel, machine wheel, and different pavement tests;

[0028] 3. This device sets parameters through the controller to limit the speed, speed change time, and stroke length of the mounting plate, and is in a uniform speed or variable speed mode to achieve a higher load, facilitating the expansion of the displacement distance of the test wheel and speed changes, and meeting different rotational speeds, uniform speeds, or variable speed conditions of the simulated wheel;

[0029] 4. This device conducts real-time monitoring and feedback of signals through a travel switch and a pressure sensor, precisely controls the load pressure and reads information in cooperation with a display and a controller, and can also achieve self-protection of the device, extending the service life of the device.

[0030] 5. This device directly drives the mounting plate to reciprocate through the driving part, and the transmission method is simple and efficient, overcoming the defects of low transmission efficiency, high noise, and easy damage in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a first-perspective three-dimensional view of the overall structure of the present utility model;

[0032] Figure 2 is a second-perspective three-dimensional view of the overall structure of the present utility model;

[0033] Figure 3 is a front view of the overall structure of the present utility model;

[0034] Figure 4 is a top view of the overall structure of the present utility model;

[0035] Figure 5 is a first-perspective three-dimensional view of the main body of the transmission structure provided by the present utility model;

[0036] Figure 6 is a second-perspective three-dimensional view of the main body of the transmission structure provided by the present utility model;

[0037] Figure 7 is an exploded view of the experimental wheel assembly and its connection structure provided by the present utility model;

[0038] Figure 8 is a system control flow chart of the intelligent control system of the present utility model.

[0039] In the figures:

[0040] Support frame - 1; Cross beam - 2; Slide rail - 3; Slide block - 4; Mounting plate - 5; Cylinder - 6; Limit fixing frame - 7; Bearing rod - 8; Pressure sensor - 9; Through hole - 10; Guide rod - 11; Experimental wheel assembly - 12; Driving part - 13; First pin shaft - 14; First pin hole - 15; Second pin shaft - 16; Second pin hole - 17; Pin - 18; Shock-absorbing spring - 19; Guide sleeve - 20; Proportional valve - 21; Travel switch - 22; Controller - 23; Display - 24;

[0041] Support rod - 71; Pressing plate - 72;

[0042] Traveling wheel - 121; Wheel plate frame - 122;

[0043] Linear guide rail - 131; Enclosed housing - 132; Servo motor - 133; Ear plate - 134; Drive rod - 135; Combination joint - 136; Card seat - 137. Detailed implementation

[0044] Combined with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0045] As Figure 1-8 shown, an automated-driven rutting tester wheel rolling test device includes a support frame 1 and two cross beams 2 located at the top of the support frame 1. Both bottoms of the two cross beams 2 are fixedly connected with slide rails 3. In this embodiment, they are connected by screws. At least one slider 4 is slidably connected to each slide rail 3. A mounting plate 5 is jointly arranged at the bottom ends of the multiple sliders 4. Specifically, the slider 4 and the mounting plate 5 are detachably installed by screws, and the lower surfaces of the multiple sliders 4 are flush, so that the mounting plate 5 is horizontally arranged; A cylinder 6 is installed on the mounting plate 5, and a pneumatic mechanism for providing kinetic energy to the cylinder 6 is provided at the connection end of the cylinder 6. A limit fixing frame 7 is also arranged outside the cylinder 6 to protect the outer shell of the cylinder 6 and prevent it from being damaged by impact, thereby extending the service life of the device;

[0046] The output end of the cylinder 6 penetrates through the mounting plate 5 and is in sliding fit with the through hole. The output end of the cylinder 6 is drivingly connected with a bearing rod 8, and a pressure sensor 9 is installed at the bottom end of the bearing rod 8. A shock-absorbing spring 19 is sleeved outside the bearing rod 8 and between the mounting plate 5 and the bearing rod 8. The wheel pressure range of the experimental wheel assembly 12 under the cooperation of the cylinder 6 and its connection structure is 0.7 MPa to 2.5 MPa;

[0047] At least two through holes 10 are formed on the mounting plate 5. The multiple through holes 10 are evenly distributed on both sides of the upper surface of the mounting plate 5, and the multiple through holes 10 are axially symmetrically distributed about the midline of the limit fixing frame 7; And a guide rod 11 is slidably connected inside the through hole 10. The bottoms of the multiple guide rods 11 are jointly connected with an experimental wheel assembly 12;

[0048] A driving part 13 is arranged on one side of the support frame 1, and the output end of the driving part 13 is drivingly connected with the mounting plate 5.

[0049] As a preferred implementation manner of the driving part 13 given by the present invention:

[0050] The driving part 13 is set as an electric push rod, and the output end of the electric push rod is combined and installed with the mounting plate 5.

[0051] As another preferred embodiment of the driving unit 13 provided by the utility model:

[0052] The driving part 13 is configured as a screw linear module, which includes a linear guide rail 131, a closed housing 132 and a servo motor 133;

[0053] Among them, in the above-mentioned structural matching mode, the closed shell 132 is buckled on the bottom of the linear guide 131, and a ball screw structure is arranged inside the cavity formed by the linear guide 131 and the closed shell 132, the servo motor 133 is fixed outside the closed shell 132, and the output shaft of the servo motor 133 is connected to the screw end of the ball screw structure, and a driving rod 135 is connected to the moving nut sleeve of the ball screw structure, and the driving rod 135 is extended out of the closed shell 132 and then rotatably connected to a combination joint 136 at its end, and a clamping seat 137 is installed at the other end of the combination joint 136, and an ear plate 134 is arranged on the side of the mounting plate 5 close to the driving part 13, and the clamping seat 137 and the ear plate 134 are matched and fitted and combined and connected through the first pin shaft 14, and after the clamping seat 137 and the ear plate 134 are combined, a gap is reserved between the two, so that the clamping seat 137 and the ear plate 134 are hingedly arranged around the first pin shaft 14;

[0054] The servo motor 133 is controlled to start so that its output shaft drives the screw end of the ball screw structure, and the moving nut sleeve moves on the screw of the ball screw structure, pushing the drive rod 135 and the combined joint 136 and the mounting plate 5. The sliders 4 on both sides move horizontally on the slide rail 3, thereby driving the cylinder 6 and its connecting structure and the experimental wheel assembly 12 to move as a whole. Through the above technical solution, part of the friction force is shared, and the excessive force between the drive rod 135 and the connecting structure when the servo motor 133 outputs power is reduced, which meets the different rotation speeds and average speed or speed change conditions of the simulated wheel. No worker is required to drive, and it is convenient to check and replace parts.

[0055] As a preferred embodiment of the experimental wheel assembly 12 provided by the utility model:

[0056] like Figure 7 As shown, the experimental wheel assembly 12 includes a running wheel 121 and a wheel plate frame 122. The running wheel 121 is rotatably connected to the inside of the wheel plate frame 122 through a rotating shaft. The upper surface of the wheel plate frame 122 is provided with a first groove matching the bottom end of the guide rod 11.

[0057] In order to better assemble and install the experimental wheel assembly 12, a second groove is opened at the bottom end of the guide rod 11, and a first pin hole 15 penetrating the second groove is opened on the side wall of the guide rod 11. A second pin shaft 16 is arranged through the upper surface of the wheel plate frame 122, and a second pin hole 17 is opened on the side wall of the second pin shaft 16. The top end of the second pin shaft 16 matches the second groove, and a pin 18 is inserted into the first pin hole 15 and the second pin hole 17 after they are aligned. The bottom end of the guide rod 11 is quickly positioned in the first groove and inserted into it. At this time, the through hole for installing the second pin shaft 16 at the top of the wheel plate frame 122 is coaxially distributed with the second groove. The second pin shaft 16 is inserted into the second groove from the bottom through hole until its top end abuts against the top wall of the second groove. At this time, the first pin hole 15 and the second pin hole 17 are coaxially distributed. The pin 18 is inserted into the first pin hole 15 and the second pin hole 17 to realize the quick disassembly and assembly of the experimental wheel assembly 12, which is convenient for maintenance and replacement.

[0058] Specifically, a guide sleeve 20 is detachably installed below the mounting plate 5 by screws. The guide sleeve 20 corresponds to the through hole 10 one by one and is coaxially distributed, and the guide rod 11 is slidably connected to the guide sleeve 20, which can improve the stability of the guide rod 11 driving the experimental wheel assembly 12 during movement.

[0059] As a preferred embodiment of the limit fixing frame 7 given by the present utility model:

[0060] The limit fixing frame 7 is set as a table-like structure composed of a support rod 71 and a pressing plate 72. The number of support rods 71 is set to four. Screw holes corresponding to the support rods 71 one by one are opened on the top surface of the mounting plate 5 and at the four corners of the pressing plate 72. External threads matching the screw holes are respectively arranged at both ends of the outer side of the support rod 71. Both ends of the support rod 71 are connected to the screw holes inside the mounting plate 5 and the pressing plate 72 through the external threads, realizing the quick assembly of the limit fixing frame 7 and improving the protection effect on the air cylinder 6.

[0061] Specifically, a gap is reserved between the two cross beams 2, and the width of the gap is greater than the width of the combined structure of the limit fixing frame 7 and the air cylinder 6, so that the air cylinder 6 can move in the gap.

[0062] Specifically, a proportional valve 21 is arranged at the input end of the air cylinder 6 to throttle and control the input flow of the air cylinder 6 in an electric control manner;

[0063] On one side of the slider 4 located at the end away from the driving part 13, a mounting plate 5 extends out, and a travel switch 22 is installed on the side wall of the slider 4 where it extends out of the mounting plate 5. The connection end of the travel switch 22 is electrically connected to a controller 23, and a display 24 is also provided at the connection end of the controller 23. The controller 23 is used to receive the feedback signals from the travel switch 22 and the pressure sensor 9, and the controller 23 controls the start / stop of the servo motor 133 according to the feedback signal of the travel switch 22 to protect the device and prevent it from hitting problems. The feedback signal of the pressure sensor 9 is displayed in real time on the display 24, and the controller 23 is also used to control the opening degree of the proportional valve 21 to improve the working stability of the cylinder 6, thereby facilitating the improvement of the accuracy of the loading pressure adjustment.

[0064] Install different types of experimental wheel assemblies 12 at the bottom of the guide rod 11 and place them at the points to be tested for wheel rolling load tests to study the mechanical behavior of the material during the compaction process.

[0065] In actual application, the following steps are carried out:

[0066] Install the experimental wheel assembly 12 to be tested at the bottom of the guide rod 11 of the whole transmission structure, and use manual or mechanical means to move the whole transmission structure to the point to be tested to complete the preparation work for the vertical air pressure loading test of the rutting meter pavement.

[0067] Control the output end of the cylinder 6 to descend so that the pressure sensor 9 fits on the top of the experimental wheel assembly 12 and push it down to the point to be tested.

[0068] Set the rotation speed and time of the experimental wheel assembly 12 during the test, and drive the mounting plate 5 through the driving part 13 to drive the slider 4 and the cylinder 6 to slide along the sliding rod together. During this process, the lower damping spring 19 and the bearing rod 8 cooperate with the proportional valve 21 connected to the cylinder 6 to calculate the loading pressure on the experimental wheel assembly 12.

[0069] Read the loading pressure in S3 and display it in real time on the display 24 to judge the loading pressure situation of the experimental wheel assembly 12 and complete one test.

[0070] Quickly replace the experimental wheel assembly 12, load with different traveling wheels 121, and repeat the operations of S1 - S4.

[0071] Loading with actual different tires is in line with the engineering practice. The pneumatic mechanism cooperates with the proportional valve 21 to pressurize the cylinder 6, and the pressure sensor 9 accurately measures the load pressure value to achieve the purpose of accurately controlling the load pressure. The driving part 13 drives the mounting plate 5 to reciprocate. Set the parameters of the driving part 13 on the controller 23 to limit the speed, variable speed time, and stroke length of the mounting plate 5, and automatically cycle the wheel rolling motion to simulate the rutting formation process, and cooperate with the pressure sensor 9 and the display 24 to accurately measure the load pressure value.

[0072] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automated-driven rutting meter wheel rolling test device, comprising a support frame (1) and two cross beams (2) located at the top of the support frame (1), characterized in that: At the bottom of each of the two cross beams (2), a slide rail (3) is fixedly connected. At least one slider (4) is slidably connected to each slide rail (3). At the bottom ends of the multiple sliders (4), a mounting plate (5) is jointly provided. A cylinder (6) is mounted on the mounting plate (5), and a pneumatic mechanism for providing kinetic energy to the cylinder (6) is provided at the connecting end of the cylinder (6). An outer limit fixing frame (7) is also provided on the outer side of the cylinder (6); The output end of the cylinder (6) is drivingly connected to a bearing rod (8), and a pressure sensor (9) is mounted at the bottom end of the bearing rod (8); At least two through holes (10) are formed in the mounting plate (5), and guide rods (11) are slidably connected inside the through holes (10). At the bottom of the multiple guide rods (11), an experimental wheel assembly (12) is jointly connected; On one side of the support frame (1), a driving part (13) is provided, and the output end of the driving part (13) is drivingly connected to the mounting plate (5).

2. The automated driving rutting tester wheel rolling test device according to claim 1, characterized in that: The driving part (13) is arranged as an electric push rod, and the output end of the electric push rod is combined and installed with the mounting plate (5).

3. An automated-driven wheel rutting test device for a rutting meter according to claim 1, characterized in that: The experimental wheel assembly (12) includes a traveling wheel (121) and a wheel plate frame (122). The traveling wheel (121) is rotationally connected inside the wheel plate frame (122) through a rotating shaft. A first groove matching the bottom end of the guide rod (11) is formed on the upper surface of the wheel plate frame (122); A second groove is formed at the bottom end of the guide rod (11), and a first pin hole (15) penetrating through the second groove is formed on the side wall of the guide rod (11). A second pin shaft (16) is penetrated and arranged on the upper surface of the wheel plate frame (122). A second pin hole (17) is formed on the side wall of the second pin shaft (16). The top end of the second pin shaft (16) matches the second groove, and a pin (18) is jointly inserted after the first pin hole (15) and the second pin hole (17) are aligned.

4. An automated-driven wheel rutting tester wheel rolling test device according to claim 1, characterized in that: The output end of the cylinder (6) penetrates through the mounting plate (5) and is in sliding fit with the through hole. A shock absorption spring (19) is sleeved outside the bearing rod (8) and between the mounting plate (5) and the bearing rod (8).

5. An automated driving rutting tester wheel rolling test device according to claim 1, characterized in that: The slider (4) and the mounting plate (5) are detachably installed by screws, and the lower surfaces of the multiple sliders (4) are flush, so that the mounting plate (5) is horizontally arranged; The multiple through holes (10) are uniformly distributed on both sides of the upper surface of the mounting plate (5), and the multiple through holes (10) are symmetrically distributed about the midline of the limit fixing frame (7).

6. The automated drive rutting tester wheel rolling test device according to claim 1, characterized in that: A guide sleeve (20) is detachably installed below the mounting plate (5) by screws. The guide sleeve (20) corresponds to the through hole (10) one by one and is coaxially distributed, and the guide rod (11) is slidably connected to the guide sleeve (20).

7. An automated driving rutting meter wheel rolling test device according to claim 1, characterized in that: The limit fixing frame (7) is arranged as a table-like structure composed of a support rod (71) and a pressing plate (72). The number of the support rods (71) is set to four. Screw holes corresponding to the support rods (71) one by one are formed on the top surface of the mounting plate (5) and at the four corners of the pressing plate (72), and external threads matching the screw holes are respectively provided at both ends of the outer side of the support rod (71).

8. An automated driving rutting meter wheel rolling test device according to claim 1, characterized in that: A gap is reserved between the two cross beams (2), and the width of the gap is greater than the width of the combined structure of the limit fixing frame (7) and the cylinder (6), so that the cylinder (6) can move in the gap.

9. An automated driving rutting tester wheel rolling test device according to claim 1, characterized in that: A proportional valve (21) is provided at the input end of the cylinder (6) to throttle and control the input flow of the cylinder (6) in an electric control manner.

10. An automated-driven wheel rutting tester wheel rolling test device according to claim 9, characterized in that: On the side of the slider (4) located at the end away from the driving part (13), a mounting plate (5) extends out. A travel switch (22) is installed on the side wall of the slider (4) where it extends out of the mounting plate (5). The connection end of the travel switch (22) is electrically connected to a controller (23). A display (24) is also provided at the connection end of the controller (23). The controller (23) is used to receive the feedback signals of the travel switch (22) and the pressure sensor (9). The controller (23) controls the start / stop of the servo motor (133) according to the feedback signal of the travel switch (22). The feedback signal of the pressure sensor (9) is displayed in real time on the display (24), and the controller (23) is also used to control the opening degree of the proportional valve (21).

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