A hydraulic control system for a chassis floating axle

Abstract

The present invention discloses a hydraulic control system for a chassis floating axle, aiming to solve the deficiency in the prior art that there is a lack of a relevant method for discharging air bubbles in an oil cylinder. The present invention solves the above technical problems through the following technical solutions: It includes a left floating oil cylinder and a right floating oil cylinder, and a first balance oil pipe and a second balance oil pipe are connected between the left floating oil cylinder and the right floating oil cylinder; first balance valves are arranged at both ends of the first balance oil pipe; second balance valves are arranged at both ends of the second balance oil pipe; a first oil passage connects a switching valve with high-pressure oil, a second oil passage connects the switching valve with a fuel tank; a third oil passage connects the switching valve with the first balance oil pipe, and a fourth oil passage connects the switching valve with the second balance oil pipe. Through the action of the switching valve and high-pressure oil, air bubbles can be very conveniently discharged from the left floating oil cylinder and the right floating oil cylinder, and during the use process, as the air bubbles decrease, the supporting effect of the floating cylinder will become better and better.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control systems for articulated boom aerial work platforms, and more specifically, to a hydraulic control system for a chassis floating axle. Background Art

[0002] The chassis of an articulated boom aerial work platform has a floating axle, enabling two wheels to swing with the undulations of the road surface. In some working conditions, for safety reasons, it is also necessary to lock the floating axle so that the wheels cannot swing. Therefore, a control system is required to control two floating cylinders on both sides of the floating axle and switch between the floating and locked states. Currently, a similar implementation is to use a balance valve to lock the cylinder, and then use a control oil circuit to control the opening and closing of the balance valve. When the control oil circuit is supplied with oil and the balance valve is opened, the two chambers of the cylinder are open and directly connected to the fuel tank, making the cylinder in a free swinging state. When the control oil circuit is disconnected and the balance valve is closed, the cylinder is in a locked state and no longer swings.

[0003] The biggest drawback of the prior art is that when the cylinder is assembled, it cannot be filled with hydraulic oil internally, and there must be a part of air. Therefore, when the cylinder is in the locked state, if the cylinder is externally squeezed, the air is easily compressed, causing the cylinder to contract or elongate. Thus, the cylinder cannot play a supporting role. When the balance valve of the cylinder is opened, not only are the two chambers inside the same cylinder interconnected, but also the two floating cylinders on the left and right are interconnected through hoses, and the two cylinders are in a complementary state, that is, when one contracts by a certain amount, the other stretches by the same amount. Therefore, the air only flows back and forth between the two chambers and between the two cylinders and cannot return to the fuel tank. In this way, the inside of the cylinder can never be filled with hydraulic oil, and it is thus difficult to achieve an ideal locking effect. If the prior art solution needs to remove air, the oil pipe needs to be unscrewed to spray out a part of the internal hydraulic oil. However, since the hose is opaque, it is impossible to accurately know where the air is located. Therefore, a large amount of time is required to drain the oil, resulting in a great waste of time, manpower, and hydraulic oil, and often with little effect. Summary of the Invention

[0004] The present invention overcomes the deficiency in the prior art of lacking a relevant method for discharging air bubbles in the cylinder, and provides a hydraulic control system for a chassis floating axle, which can automatically discharge the air bubbles in the cylinder into the fuel tank by increasing the oil pressure.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: A hydraulic control system for a chassis floating axle, comprising: a left floating cylinder and a right floating cylinder, and a first balance oil pipe and a second balance oil pipe are connected between the left floating cylinder and the right floating cylinder;

[0006] First balance valves are provided at both ends of the first balance oil pipe;

[0007] Both ends of the second balance oil pipe are provided with second balance valves;

[0008] The first oil passage connects the switching valve and the high-pressure oil, and the second oil passage connects the switching valve and the fuel tank;

[0009] The third oil passage connects the switching valve and the first balance oil pipe, and the fourth oil passage connects the switching valve and the second balance oil pipe;

[0010] Among them, when the switching valve is not powered on, the first oil passage and the third oil passage are connected through the switching valve, the first balance valve is opened, and the high-pressure oil enters the left floating oil cylinder and the right floating oil cylinder;

[0011] When the switching valve is powered on, the first oil passage and the fourth oil passage are connected through the switching valve, and the second balance valve is opened; the second oil passage and the third oil passage are connected through the switching valve, and the air in the left floating oil cylinder and the right floating oil cylinder expands, pushing the excess oil and part of the bubbles back to the fuel tank.

[0012] When the present invention is in use, through the action of the switching valve and the high-pressure oil, the bubbles can be very conveniently discharged from the left floating oil cylinder and the right floating oil cylinder, and after assembly, the complicated and long exhaust process can be omitted and it can be directly put into use. The supporting effect of the floating cylinder has reached a satisfactory level, and during the use process, as the bubbles decrease, the supporting effect of the floating cylinder will be better and better.

[0013] Preferably, a pressure reducing valve is provided on the first oil passage.

[0014] The pressure reducing valve reduces the pressure of the high-pressure oil to 4 MPa to 6 MPa, which plays a role in protecting the valve and preventing the valve core from being damaged by the high pressure.

[0015] Preferably, the pressure of the high-pressure oil of the pressure reducing valve is reduced to 4 MPa to 6 MPa.

[0016] Within this range, it can not only play a role in protecting the valve, but also make the effect of discharging bubbles better.

[0017] Preferably, the end of the first oil passage far from the switching valve is communicated with the fuel tank, and a high-pressure oil pump for generating high-pressure oil is provided on the first oil passage.

[0018] Preferably, upper end covers are provided at the upper ends of the left floating oil cylinder and the right floating oil cylinder. The upper end covers are provided with fixing plates. First transverse plates and second transverse plates are provided at both ends of the fixing plates. Both ends of the first transverse plate are respectively rotatably connected between the fixing plate and the oil cylinder wall, and both ends of the second transverse plate are respectively rotatably connected between the other end of the fixing plate and the oil cylinder wall on the other side;

[0019] A first longitudinal plate is rotatably arranged between the fixing plate and the oil cylinder wall;

[0020] Above the oil cylinder, a bubble storage cavity is formed among the first longitudinal plate, the fixed plate and the first transverse plate. The interface of the first balance oil pipe and the oil cylinder is arranged above the bubble storage cavity.

[0021] At the upper ends of the first longitudinal plate, the first transverse plate and the second transverse plate, there are all abutting surfaces, so that when the bubble storage cavity inclines upward, the first longitudinal plate, the first transverse plate and the second transverse plate rotate.

[0022] In order to enable the bubbles to be discharged from the first balance oil pipe better, this embodiment is set. The specific working principle is as follows: taking the first transverse plate as an example, as shown in the figure, when the upper ends of the left floating oil cylinder and the right floating oil cylinder are in a horizontal state, at this time, the first transverse plate is affected by the weight block, and the upper end of the first transverse plate abuts against the upper abutting surface, so that the upper ends of the left floating oil cylinder and the right floating oil cylinder are divided into two areas; as shown in the figure, when the left floating oil cylinder and the right floating oil cylinder rotate, making the connection port between the first balance oil pipe and the upper end cover incline upward, at this time, the first transverse plate is affected by the weight block at the lower end and is in a vertical state, so that a gap is generated between the upper end of the first transverse plate and the upper end cover. Since the bubbles will float upward in the liquid, the gas in the left floating oil cylinder and the right floating oil cylinder moves towards the bubble storage cavity, so that the bubbles are collected in the bubble storage cavity; as shown in the figure, when the left floating oil cylinder and the right floating oil cylinder rotate, making the connection port between the first balance oil pipe and the upper end cover incline downward, at this time, although the first transverse plate is affected by the weight block at the lower end, but because the upper end of the first transverse plate abuts against the abutting surface, the upper end of the first transverse plate still abuts against the abutting surface, so that the bubbles are locked in the bubble storage cavity. Therefore, similarly, through the action of the first transverse plate and the second transverse plate, the bubbles can be gathered towards the side close to the bubble storage cavity, and then through the action of the first longitudinal plate, the bubbles can be gathered into the bubble storage cavity, so that when the bubbles are discharged through the steps in the embodiment when the left floating oil cylinder and the right floating oil cylinder rotate, the discharging effect is better.

[0023] Preferably, at the lower ends of the first longitudinal plate, the first transverse plate and the second transverse plate, there are all rigid connecting rods, and a weight block is connected below the rigid connecting rods.

[0024] The setting of the weight block makes the first longitudinal plate, the first transverse plate and the second transverse plate rotate more sensitively.

[0025] Preferably, the weight block is disc-shaped, and the end face of the disc-shaped weight block is parallel to its swinging direction.

[0026] The disc shape reduces the resistance of the weight block when swinging inside the left floating oil cylinder and the right floating oil cylinder.

[0027] Preferably, the upper end cover is provided with an abutting groove, the abutting surface is the side surface on one side of the abutting groove, the other side of the abutting groove is arc-shaped, and a rubber strip is arranged in the arc groove.

[0028] The rubber strip can play a role in sealing and shock absorption, preventing air bubbles from leaking out of the air bubble storage cavity.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] (1) Air bubbles can be very conveniently discharged from the left floating oil cylinder and the right floating oil cylinder, and after assembly, the complicated and long exhaust process can be omitted and it can be directly put into use, which has the characteristic of convenient use;

[0031] (2) The effect of discharging air bubbles is better, and during the use process, as the air bubbles decrease, the supporting effect of the floating cylinder will become better and better. Description of the Drawings

[0032] Figure 1 is the system schematic diagram of the present invention;

[0033] Figure 2 is the structural diagram of the upper end cover of the floating oil cylinder of the present invention;

[0034] Figure 3 is the cross-sectional view of the upper end cover of the floating oil cylinder of the present invention;

[0035] Figure 4 is the cross-sectional view of the upper end cover of the floating oil cylinder of the present invention from another angle;

[0036] Figure 5 is the first state diagram in the second embodiment of the present invention;

[0037] Figure 6 is Figure 5 the partial enlarged view in;

[0038] Figure 7 is the second state diagram in the second embodiment of the present invention;

[0039] Figure 8 is the third state diagram in the second embodiment of the present invention;

[0040] In the figure: 11, left floating oil cylinder; 12, right floating oil cylinder; 13, upper end cover, 131, oil cylinder wall, 132, abutting groove, 133, abutting surface, 134, rubber strip; 21, first balance oil pipe, 211, first balance valve; 22, second balance oil pipe, 221, second balance valve; 31, first oil passage, 32, second oil passage, 33, third oil passage, 34, fourth oil passage; 4, switching valve; 5, oil return tank; 6, pressure reducing valve; 7, high-pressure oil pump; 81, fixing plate, 82, first transverse plate, 821, first rotating shaft, 83, second transverse plate, 831, second rotating shaft, 84, first longitudinal plate, 841, longitudinal rotating shaft, 85, bubble storage cavity, 87, rigid connecting rod, 88, weight. Detailed implementation mode

[0041] The technical solution of the present invention will be further specifically described below through specific embodiments in conjunction with the accompanying drawings:

[0042] Embodiment 1: Refer to Figures 1 to 8 As shown, a hydraulic control system for a chassis floating axle includes: a left floating oil cylinder 11 and a right floating oil cylinder 12, and a first balance oil pipe 21 and a second balance oil pipe 22 are connected between the left floating oil cylinder 11 and the right floating oil cylinder 12;

[0043] First balance valves 211 are provided at both ends of the first balance oil pipe 21;

[0044] Second balance valves 221 are provided at both ends of the second balance oil pipe 22;

[0045] The first oil passage 31 connects the switching valve 4 with high-pressure oil, and the second oil passage 32 connects the switching valve 4 with the oil tank 5;

[0046] The third oil passage 33 connects the switching valve 4 with the first balance oil pipe 21, and the fourth oil passage 34 connects the switching valve 4 with the second balance oil pipe 22;

[0047] A pressure reducing valve 6 is provided on the first oil passage 31. The pressure reducing valve 6 reduces the high-pressure oil pressure to 4 MPa to 6 MPa. In this embodiment, high-pressure oil with an oil pressure of 5 MPa is used; at one end of the first oil passage 31 far from the switching valve 4, it is communicated with the oil tank 5, and a high-pressure oil pump 7 for generating high-pressure oil is provided on the first oil passage 31. The high-pressure oil pump 7 makes the oil in the oil tank 5 become high-pressure oil; in this embodiment, the first oil passage 31, the second oil passage 32, the third oil passage 33 and the fourth oil passage 34 are all arranged inside the switching valve 4, which is the internal structure of the switching valve 4 and belongs to the prior art.

[0048] During use: When the switching valve 4 is de-energized, the left floating cylinder 11 and the right floating cylinder 12 are in a locked state at this time. The first oil passage 31 is communicated with the third oil passage 33 through the switching valve 4. The first balance valve 211 is opened, and the second balance valve 221 is closed. The high-pressure oil sequentially passes through the first oil passage 31, the second oil passage 33 and the first balance oil pipe 21 and enters the left floating cylinder 11 and the right floating cylinder 12.

[0049] When the switching valve 4 is energized, the switching valve changes its position, so that the first oil passage 31 is communicated with the fourth oil passage 34 through the switching valve 4. The high-pressure oil sequentially passes through the first oil passage 31, the fourth oil passage 34 and the second balance oil pipe 22 to push the second balance valve 221 to open. At this time, the left floating cylinder 11 and the right floating cylinder 12 are in a floating state. At this time, the second oil passage 32 is communicated with the third oil passage 33 through the switching valve 4, so that the first balance oil pipe 22 at this time is communicated with the fuel tank 5 through the third oil passage 33 and the second oil passage 32 in sequence. Since the pressure of the fuel tank 5 is relatively small, the internal pressure of the left floating cylinder 11 and the right floating cylinder 12 is high due to the action of the high-pressure oil. When the floating cylinders 11 and 12 contact the fuel tank 5, the air in the left floating cylinder 11 and the right floating cylinder 12 expands, and the excess oil and some bubbles are pushed back into the fuel tank 5.

[0050] When the present invention is in use, when the left floating cylinder 11 and the right floating cylinder 12 are in a locked state at this time, due to the action of the high-pressure oil, since the internal oil pressure of the left floating cylinder 11 and the right floating cylinder 12 is 5 MPa at this time, which is 50 times the atmospheric pressure, the volume of the bubbles inside the left floating cylinder 11 and the right floating cylinder 12 at this time is one-fiftieth of the original. So that the telescopic amplitude of the left floating cylinder 11 and the right floating cylinder 12 is one-fiftieth of the original even when subjected to external pressure, which can be ignored. It can be considered that the oil cylinders are in a rigid support state at this time.

[0051] Through the action of the switching valve 4, the left floating cylinder 11 and the right floating cylinder 12 are in a floating state at this time. The second oil passage 32 is communicated with the third oil passage 33 through the switching valve 4, so that the first balance oil pipe 22 at this time is communicated with the fuel tank 5 through the third oil passage 33 and the second oil passage 32 in sequence. Since the pressure of the fuel tank 5 is relatively small, the internal pressure of the left floating cylinder 11 and the right floating cylinder 12 is high due to the action of the high-pressure oil. When the floating cylinders 11 and 12 contact the fuel tank 5, the air in the left floating cylinder 11 and the right floating cylinder 12 expands, and the excess oil and some bubbles can be pushed back into the fuel tank 5. Although only part of the bubbles can be pushed back into the fuel tank 5, repeating several times can make the bubbles completely removed.

[0052] Therefore, through the above steps, it is very convenient to discharge the air bubbles from the left floating oil cylinder 11 and the right floating oil cylinder 12. After assembly, it can be directly put into use without the complicated and time-consuming air exhaust process. The supporting effect of the floating cylinder has reached a satisfactory level, and during the use process, as the air bubbles decrease, the supporting effect of the floating cylinder will become better and better.

[0053] Embodiment 2: Refer to Figures 1 to 8 As described above, the structure of this embodiment is similar to that of Embodiment 1. The difference is that upper end covers 13 are provided at the upper ends of the left floating oil cylinder 11 and the right floating oil cylinder 12. A fixing plate 81 is fixedly provided on the upper end cover 13. First transverse plates 82 and second transverse plates 83 are provided at both ends of the fixing plate 81. The first transverse plates 82 and the second transverse plates 83 are light thin plates. First rotating shafts 821 are provided at both ends of the first transverse plate 82, and the first rotating shafts 821 at both ends are respectively rotatably connected between the fixing plate 81 and the oil cylinder wall 131; both ends of the second transverse plate 83 are respectively rotatably connected between the other end of the fixing plate 81 and the oil cylinder wall 131 on the other side through second rotating shafts 831;

[0054] A first longitudinal plate 84 is rotatably provided between the fixing plate 81 and the oil cylinder wall 131. Longitudinal rotating shafts 841 are provided at both ends of the first longitudinal plate 84, and it can be rotatably provided between the fixing plate 81 and the oil cylinder wall 131 through the longitudinal rotating shafts 841;

[0055] An air bubble storage cavity 85 is formed above the oil cylinder among the first longitudinal plate 84, the fixing plate 81 and the first transverse plate 82. The interface of the first balance oil pipe 21 and the oil cylinder is arranged above the air bubble storage cavity 85.

[0056] At the upper ends of the first longitudinal plate 84, the first transverse plate 82 and the second transverse plate 83, abutting grooves 132 are correspondingly provided on the upper end cover 13. The abutting surface 133 is the side wall on one side of the abutting groove 132, and the other side of the abutting groove 132 is arc-shaped. A rubber strip is arranged in the abutting groove 132, and the rubber strip 134 can play a role in sealing and vibration reduction; when the air bubble storage cavity 85 tilts upward, the first longitudinal plate 84, the first transverse plate 82 and the second transverse plate 83 rotate.

[0057] Rigid connecting rods 87 are provided at the lower ends of the first longitudinal plate 84, the first transverse plate 82 and the second transverse plate 83. A weight 88 is connected below the rigid connecting rods 87. The setting of the weight 88 makes the first longitudinal plate 84, the first transverse plate 82 and the second transverse plate 83 rotate more sensitively. The weight 88 is in the shape of a round cake, and the end face of the round cake-shaped weight 88 is parallel to its swinging direction. The round cake shape reduces the resistance of the weight 88 when swinging inside the left floating oil cylinder 11 and the right floating oil cylinder 12.

[0058] In this embodiment, in order to enable the bubbles to be discharged from the first balance oil pipe 21 better, this embodiment is set. The specific working principle is as follows: Taking the first transverse plate 82 as an example, as Figure 6 shown, when the upper ends of the left floating oil cylinder 11 and the right floating oil cylinder 12 are in a horizontal state, at this time, the first transverse plate 82 is affected by the weight, and the upper end of the first transverse plate 82 abuts against the upper abutting surface 133, so that the upper ends of the left floating oil cylinder 11 and the right floating oil cylinder 12 are divided into two regions; as Figure 7 shown, when the left floating oil cylinder 11 and the right floating oil cylinder 12 rotate to make the connection port between the first balance oil pipe 21 and the upper end cover 13 tilt upward, at this time, the first transverse plate 82 is affected by the weight 88 at the lower end and is in a vertical state, so that a gap is generated between the upper end of the first transverse plate 82 and the upper end cover 13. Since the bubbles will float upward in the liquid, the gas in the left floating oil cylinder 11 and the right floating oil cylinder 12 moves towards the bubble storage cavity 85, so that the bubbles are collected in the bubble storage cavity 85; as Figure 8 shown, when the left floating oil cylinder 11 and the right floating oil cylinder 12 rotate to make the connection port between the first balance oil pipe 21 and the upper end cover 13 tilt downward, although the first transverse plate 82 is affected by the weight 88 at the lower end at this time, since the upper end of the first transverse plate 82 abuts against the abutting surface 133, the upper end of the first transverse plate 82 still abuts against the abutting surface 133, so that the bubbles are locked in the bubble storage cavity 85.

[0059] Therefore, similarly, through the action of the first transverse plate 82 and the second transverse plate 83, the bubbles can be gathered towards the side close to the bubble storage cavity 85. Then, through the action of the first longitudinal plate 84, the bubbles can be gathered into the bubble storage cavity 85, so that when the bubbles are discharged by the steps in Embodiment 1 when the left floating oil cylinder 11 and the right floating oil cylinder 12 rotate, the discharging effect is better.

[0060] The above-described embodiments are only the preferred solutions of the present invention, and do not impose any form of limitation on the present invention. There are other variants and modifications without exceeding the technical solutions recorded in the claims.

Claims

1. A hydraulic control system for a chassis floating axle, characterized in that Including: A left floating oil cylinder and a right floating oil cylinder, with a first balance oil pipe and a second balance oil pipe communicating between the left floating oil cylinder and the right floating oil cylinder; First balance valves are arranged at both ends of the first balance oil pipe; Second balance valves are arranged at both ends of the second balance oil pipe; A first oil passage connects the switching valve to high-pressure oil, and a second oil passage connects the switching valve to the oil tank; A third oil passage connects the switching valve to the first balance oil pipe, and a fourth oil passage connects the switching valve to the second balance oil pipe; Among them, when the switching valve is not powered on, the first oil passage and the third oil passage are connected through the switching valve, the first balance valve is opened, the second balance valve is closed, and high-pressure oil enters the left floating oil cylinder and the right floating oil cylinder; When the switching valve is powered on, the first oil passage and the fourth oil passage are connected through the switching valve, and the second balance valve is opened; the second oil passage and the third oil passage are connected through the switching valve, and the air in the left floating oil cylinder and the right floating oil cylinder expands, pushing the excess oil and part of the bubbles back to the oil tank.

2. The hydraulic control system of the chassis floating axle according to claim 1, wherein A pressure reducing valve is arranged on the first oil passage.

3. The hydraulic control system for the chassis floating axle according to claim 2, characterized in that, The pressure drop of the high-pressure oil of the pressure reducing valve is 4 MPa to 6 MPa.

4. The hydraulic control system for the chassis floating axle according to claim 1, characterized in that, One end of the first oil passage far from the switching valve communicates with the oil tank, and a high-pressure oil pump for generating high-pressure oil is arranged on the first oil passage.

5. The hydraulic control system for the chassis floating axle according to any one of claims 1 to 4, characterized in that, Upper end covers are arranged at the upper ends of the left floating oil cylinder and the right floating oil cylinder. The upper end covers are provided with fixing plates. First transverse plates and second transverse plates are arranged at both ends of the fixing plates. The two ends of the first transverse plate are respectively rotatably connected between the fixing plate and the oil cylinder wall, and the two ends of the second transverse plate are respectively rotatably connected between the other end of the fixing plate and the oil cylinder wall on the other side; A first longitudinal plate is rotatably arranged between the fixing plate and the oil cylinder wall; A bubble storage cavity is formed above the oil cylinder among the first longitudinal plate, the fixing plate and the first transverse plate. The interface of the first balance oil pipe and the oil cylinder is arranged above the bubble storage cavity; Contact surfaces are arranged at the upper ends of the first longitudinal plate, the first transverse plate and the second transverse plate, so that when the bubble storage cavity inclines upward, the first longitudinal plate, the first transverse plate and the second transverse plate rotate.

6. The hydraulic control system for the chassis floating axle according to claim 5, characterized in that, Rigid connecting rods are arranged at the lower ends of the first longitudinal plate, the first transverse plate and the second transverse plate, and weights are connected below the rigid connecting rods.

7. The hydraulic control system for the chassis floating axle according to claim 6, characterized in that The weight is disc-shaped, and the end face of the disc-shaped weight is parallel to its swinging direction.

8. The hydraulic control system for the chassis floating axle according to claim 5, characterized in that, The upper end cover is provided with a contact groove, the contact surface is the side surface on one side of the contact groove, the other side of the contact groove is arc-shaped, and a rubber strip is arranged in the arc groove.

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