A sensorless feedback-free tension release device for hydraulic tensioning

Abstract

A device for rapid tension release without sensor feedback for hydraulic tensioning, wherein the main reversing valve is connected to the hydraulic winch motor via two balancing valves; the two comparison ports of the first shuttle valve are respectively connected to the A and B ports of the main reversing valve, and its output port is connected to a comparison port of the second shuttle valve; the other comparison port of the second shuttle valve is simultaneously connected to the oil outlet of the sequence valve, the control port of the first reversing valve, and the oil inlets of the two oil replenishing valves, and the output port of the second shuttle valve is connected to the B port of the second reversing valve; the oil outlets of the two oil replenishing valves are respectively connected to the two oil ports of the hydraulic winch motor; the two oil ports of the first reversing valve are respectively connected to the two oil ports of the hydraulic winch motor; the A port of the second reversing valve is connected to the brake; the A port of the auxiliary reversing valve is connected to the rodless chamber oil port of the tensioning oil cylinder, and its B port is connected to the rod chamber oil port of the tensioning oil cylinder through a hydraulically controlled one-way valve; the accumulator is simultaneously connected to the rod chamber oil port of the tensioning oil cylinder and the oil inlet of the sequence valve. The device can ensure the timely release of tension.

Description

Technical Field

[0001] The invention belongs to the technical field of belt conveyor tensioning devices, and in particular relates to a hydraulic tensioning, sensor-free feedback, and rapid tension release device. Background Art

[0002] With the development of belt conveyor technology, its application scope is gradually expanding. As one of the main components of belt conveyors, the technology of hydraulic tensioning devices is also constantly developing. The tensioning force of existing hydraulic tensioning devices is automatically adjustable. However, the tension of hydraulic tensioning devices is usually collected by tension sensors, and the collected tension signals are further fed back to the electronic control system, which is then fed back to the hydraulic system through the electronic control system and performs corresponding actions. This control method has the problem of untimely tension release. At the same time, when the tension sensor is damaged, it is easy to malfunction, which will cause damage to the equipment and even cause safety accidents. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the present invention provides a hydraulic tensioning sensorless feedback quick tension release device, which does not require the use of a tension sensor to collect the tension signal, and can avoid damage to the equipment due to the failure to release the tension in time, thereby effectively improving the reliability and safety of the equipment.

[0004] In order to achieve the above-mentioned object, the present invention provides a hydraulic tensioning sensorless feedback quick release tension device, comprising a main reversing valve, an auxiliary reversing valve, a hydraulic winch motor, a brake, a tensioning oil cylinder, a first balancing valve, a second balancing valve, a first shuttle valve, a second shuttle valve, a first oil replenishing valve, a second oil replenishing valve, a first reversing valve, a second reversing valve and an accumulator;

[0005] The P port of the main reversing valve is connected to the hydraulic oil source, the T port thereof is connected to the hydraulic oil tank, the A port of the main reversing valve is connected to the oil inlet of the first balancing valve, the oil outlet of the first balancing valve is connected to the A port of the hydraulic winch motor, the B port of the main reversing valve is connected to the oil inlet of the second balancing valve, the oil outlet of the second balancing valve is connected to the B port of the hydraulic winch motor, the control port of the first balancing valve is connected to the oil inlet of the second balancing valve, and the control port of the second balancing valve is connected to the oil inlet of the first balancing valve;

[0006] The two comparison ports of the first shuttle valve are respectively connected to the A port and the B port of the main reversing valve, and the output port thereof is connected to a comparison port of the second shuttle valve. The other comparison port of the second shuttle valve is simultaneously connected to the oil outlet of the sequence valve, the control port of the first reversing valve, the oil inlet of the first oil replenishing valve and the oil inlet of the second oil replenishing valve. The output port of the second shuttle valve is connected to the B port of the second reversing valve.

[0007] The oil outlet of the first oil supply valve is connected to the A port of the hydraulic winch motor, and the oil outlet of the second oil supply valve is connected to the B port of the hydraulic winch motor;

[0008] The port A and the port B of the first reversing valve are connected to the port A and the port B of the hydraulic winch motor respectively;

[0009] The B port of the second reversing valve is connected to the control port at one end thereof, the P port of the second reversing valve is connected to the hydraulic oil tank, the A port thereof is connected to the brake, and at the same time, is also connected to the spring chamber at the other end thereof; the brake is arranged near the hydraulic winch motor, and is used to realize the braking operation or the releasing operation of the hydraulic winch motor;

[0010] The P port of the auxiliary reversing valve is connected to the hydraulic oil source, the T port thereof is connected to the hydraulic oil tank, the A port of the auxiliary reversing valve is connected to the rodless chamber oil port of the tensioning cylinder, the B port thereof is connected to the oil inlet of the hydraulically controlled one-way valve, the oil outlet of the hydraulically controlled one-way valve is connected to the rod chamber oil port of the tensioning cylinder, and the hydraulically controlled port of the hydraulically controlled one-way valve is connected to the A port of the auxiliary reversing valve;

[0011] The working oil port of the accumulator is connected to the rod chamber oil port of the tensioning oil cylinder and the oil inlet port of the sequence valve at the same time.

[0012] Furthermore, in order to maintain the pressure of the branch where the accumulator is located within a set range, a pressure switch and a relief valve are also included. The oil inlet of the pressure switch is connected to the working oil port of the accumulator, and the oil outlet is connected to the hydraulic oil tank through the relief valve.

[0013] Furthermore, in order to facilitate real-time viewing of the pressure conditions, a pressure gauge is also included, and the pressure gauge is connected to the working oil port of the accumulator.

[0014] As a preference, the number of the energy accumulators is two.

[0015] As a preferred embodiment, the main reversing valve is a three-position four-way solenoid reversing valve. When it is energized and working in the left position, the oil circuit between its P port and B port is connected, and the oil circuit between its T port and A port is connected. When it is de-energized and working in the middle position, its P port is cut off, and the oil circuits between its T port, A port and B port are connected. When it is energized and working in the right position, the oil circuit between its P port and A port is connected, and the oil circuit between its T port and B port is connected.

[0016] As a preferred embodiment, the auxiliary reversing valve is a manual three-position four-way reversing valve. When it is energized and working in the left position, the oil circuit between its P port and B port is connected, and the oil circuit between its T port and A port is connected. When it is de-energized and working in the middle position, the oil circuit between its P port and T port is connected, and its A port and B port are both cut off. When it is energized and working in the right position, the oil circuit between its P port and A port is connected, and the oil circuit between its T port and B port is connected.

[0017] As a preference, the first reversing valve is a two-position, two-way hydraulically controlled reversing valve, which, when working in an upper position, has its oil circuit between port A and port B disconnected, and, when working in a lower position, has its oil circuit between port A and port B connected.

[0018] As a preferred embodiment, the second reversing valve is a two-position three-way hydraulically controlled reversing valve. When it works in the left position, the oil circuit between its A port and its B port is disconnected, and its P port is cut off. When it works in the right position, the oil circuit between its A port and its P port is connected, and its B port is cut off.

[0019] In the present invention, the A port and the B port of the first reversing valve are connected to the A port and the B port of the hydraulic winch motor respectively, and at the same time, the oil inlet port of the sequence valve is connected to the rod chamber oil port of the tensioning oil cylinder and the control port of the first reversing valve respectively, and the accumulator is connected to the rod chamber oil port of the tensioning oil cylinder. In this way, after the pressure in the rod chamber of the tensioning oil cylinder rises to the set pressure, the sequence valve will automatically open, and then the oil stored in the accumulator can be used to push the first reversing valve to change direction. At the same time, the oil stored in the accumulator will also push the second reversing valve to change direction through the second shuttle valve, so that the hydraulic winch motor can release the tension. Compared with the prior art, the device uses the system's own pressure to automatically control the tension release process, which can ensure the timely release of the tension, thereby avoiding the problem that the high tension cannot be released in time through the sensor feedback method, and avoiding the situation that the tension cannot be released in time and causes equipment damage, thereby improving the reliability and safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] In the figure: 1. main reversing valve, 2. auxiliary reversing valve, 3. brake, 4. hydraulic winch motor, 5. tensioning cylinder, 6. hydraulically controlled one-way valve, 7. first balancing valve, 8. second balancing valve, 9. first reversing valve, 10. second reversing valve, 11. first shuttle valve, 12. second shuttle valve, 13. sequence valve, 14. first oil supply valve, 15. second oil supply valve, 16. accumulator, 17. pressure switch, 18. relief valve, 19. pressure gauge. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] like Figure 1 As shown, a hydraulic tensioning sensorless feedback quick release tension device comprises a main reversing valve 1, an auxiliary reversing valve 2, a hydraulic winch motor 4, a brake 3, a tensioning cylinder 5, a first balancing valve 7, a second balancing valve 8, a first shuttle valve 11, a second shuttle valve 12, a first oil replenishing valve 14, a second oil replenishing valve 15, a first reversing valve 9, a second reversing valve 10 and an accumulator 16;

[0024] The P port of the main reversing valve 1 is connected to the hydraulic oil source, the T port thereof is connected to the hydraulic oil tank, the A port of the main reversing valve 1 is connected to the oil inlet of the first balancing valve 7, the oil outlet of the first balancing valve 7 is connected to the A port of the hydraulic winch motor 4, the B port of the main reversing valve 1 is connected to the oil inlet of the second balancing valve 8, the oil outlet of the second balancing valve 8 is connected to the B port of the hydraulic winch motor 4, the control port of the first balancing valve 7 is connected to the oil inlet of the second balancing valve 8, and the control port of the second balancing valve 8 is connected to the oil inlet of the first balancing valve 7;

[0025] The two comparison ports of the first shuttle valve 11 are respectively connected to the A port and the B port of the main reversing valve 1, and the output port thereof is connected to a comparison port of the second shuttle valve 12. The other comparison port of the second shuttle valve 12 is simultaneously connected to the oil outlet of the sequence valve 13, the control port of the first reversing valve 9, the oil inlet of the first oil replenishing valve 14 and the oil inlet of the second oil replenishing valve 15. The output port of the second shuttle valve 12 is connected to the B port of the second reversing valve 10.

[0026] The oil outlet of the first oil replenishment valve 14 is connected to the port A of the hydraulic winch motor 4, and the oil outlet of the second oil replenishment valve 15 is connected to the port B of the hydraulic winch motor 4;

[0027] The port A and the port B of the first reversing valve 9 are connected to the port A and the port B of the hydraulic winch motor 4 respectively;

[0028] The B port of the second reversing valve 10 is connected to the control port at one end thereof, the P port of the second reversing valve 10 is connected to the hydraulic oil tank, the A port thereof is connected to the brake 3, and at the same time, is also connected to the spring chamber at the other end thereof; the brake 3 is arranged near the hydraulic winch motor 4, and is used to realize the braking operation or the releasing operation of the hydraulic winch motor 4;

[0029] The P port of the auxiliary reversing valve 2 is connected to the hydraulic oil source, the T port thereof is connected to the hydraulic oil tank, the A port of the auxiliary reversing valve 2 is connected to the rodless chamber oil port of the tensioning cylinder 5, the B port thereof is connected to the oil inlet of the hydraulically controlled one-way valve 6, the oil outlet of the hydraulically controlled one-way valve 6 is connected to the rod chamber oil port of the tensioning cylinder 5, and the hydraulically controlled port of the hydraulically controlled one-way valve 6 is connected to the A port of the auxiliary reversing valve 2;

[0030] The working oil port of the accumulator 16 is connected to the rod chamber oil port of the tensioning cylinder 5 and the oil inlet of the sequence valve 13 at the same time.

[0031] In order to maintain the pressure of the branch where the accumulator is located within a set range, a pressure switch 17 and a relief valve 18 are also included. The oil inlet of the pressure switch 17 is connected to the working oil port of the accumulator 16, and the oil outlet is connected to the hydraulic oil tank through the relief valve 18.

[0032] In order to facilitate real-time viewing of the pressure situation, a pressure gauge 19 is also included, and the pressure gauge 19 is connected to the working oil port of the accumulator 16.

[0033] As a preferred embodiment, the number of the energy accumulators 16 is two.

[0034] As a preferred embodiment, the main reversing valve 1 is a three-position four-way solenoid reversing valve. When it is energized and working in the left position, the oil circuit between its P port and B port is connected, and the oil circuit between its T port and A port is connected. When it is de-energized and working in the middle position, its P port is cut off, and the oil circuits between its T port, A port and B port are connected. When it is energized and working in the right position, the oil circuit between its P port and A port is connected, and the oil circuit between its T port and B port is connected.

[0035] As a preferred embodiment, the auxiliary reversing valve 2 is a manual three-position four-way reversing valve. When it is energized and working in the left position, the oil circuit between its P port and B port is connected, and the oil circuit between its T port and A port is connected. When it is de-energized and working in the middle position, the oil circuit between its P port and T port is connected, and its A port and B port are both cut off. When it is energized and working in the right position, the oil circuit between its P port and A port is connected, and the oil circuit between its T port and B port is connected.

[0036] As a preferred embodiment, the first reversing valve 9 is a two-position two-way hydraulically controlled reversing valve. When it works in the upper position, the oil circuit between its A port and its B port is disconnected, and when it works in the lower position, the oil circuit between its A port and its B port is connected.

[0037] As a preferred embodiment, the second reversing valve 10 is a two-position three-way hydraulically controlled reversing valve. When it works in the left position, the oil circuit between its A port and its B port is disconnected, and its P port is cut off. When it works in the right position, the oil circuit between its A port and its P port is connected, and its B port is cut off.

[0038] In the present invention, the A port and the B port of the first reversing valve are connected to the A port and the B port of the hydraulic winch motor respectively, and at the same time, the oil inlet port of the sequence valve is connected to the rod chamber oil port of the tensioning oil cylinder and the control port of the first reversing valve respectively, and the accumulator is connected to the rod chamber oil port of the tensioning oil cylinder. In this way, after the pressure in the rod chamber of the tensioning oil cylinder rises to the set pressure, the sequence valve will automatically open, and then the oil stored in the accumulator can be used to push the first reversing valve to change direction. At the same time, the oil stored in the accumulator will also push the second reversing valve to change direction through the second shuttle valve, so that the hydraulic winch motor can release the tension. Compared with the prior art, the device uses the system's own pressure to automatically control the tension release process, which can ensure the timely release of the tension, thereby avoiding the problem that the high tension cannot be released in time through the sensor feedback method, and avoiding the situation that the tension cannot be released in time and causes equipment damage, thereby improving the reliability and safety of the equipment.

[0039] Working principle: When the external pressure is higher than the set pressure of the sequence valve 13, the oil pressure on the oil inlet side of the sequence valve 13 increases, the sequence valve 13 opens, and a part of the oil stored in the accumulator 16 reaches the control port of the first reversing valve 9 through the sequence valve 13, thereby making the first reversing valve 9 work in the lower position, and the oil circuit between its A port and B port is connected, so that the A port and B port of the hydraulic winch motor 4 are connected to each other. At the same time, a part of the oil stored in the accumulator 16 reaches the right comparative oil port of the second shuttle valve 12 through the sequence valve 13, and the pressure is relatively high. At the same time, since the A port and B port of the hydraulic winch motor 4 are connected to each other, the pressures of the two comparative oil ports of the first shuttle valve 12 are basically equal, and the The pressure from the output port of the first shuttle valve 12 to the left comparative oil port of the second shuttle valve 12 is relatively low, and the output oil port of the second shuttle valve 12 outputs oil of a certain pressure to the B port of the second reversing valve 10, and then acts on the control port of the second reversing valve 10 at the same time, so that the second reversing valve 10 is reversed and works in the left position. In this way, the oil output from the output oil port of the second shuttle valve 12 enters the brake 3, the brake 3 is started, and the hydraulic winch motor 4 releases the tension. During the tension release process, the oil stored in the accumulator 16 is supplied to the oil inlet of the first oil replenishing valve 14 and the oil inlet of the second oil replenishing valve 15 through the sequence valve 13, and then replenishes oil to the low-pressure side to prevent the system from being sucked in during the tension release process. When the external pressure is less than the set pressure of the sequence valve 13, the sequence valve 13 is closed, the first reversing valve 9 is reversed, and the oil circuit between its A port and B port is disconnected. At this time, the pressures of the two comparative oil ports of the first shuttle valve 11 are almost equal, and the pressures of the two comparative oil ports of the second shuttle valve 12 are almost equal, and its output oil port hardly outputs pressure. The second reversing valve 10 works in the right position under the action of the brake 3, and the brake 3 brakes the hydraulic winch motor 4.

Claims

1. A hydraulic tensioning sensorless feedback quick release tension device, comprising a main reversing valve (1), an auxiliary reversing valve (2), a hydraulic winch motor (4), a brake (3) and a tensioning cylinder (5), characterized in that: It also includes a first balancing valve (7), a second balancing valve (8), a first shuttle valve (11), a second shuttle valve (12), a first oil replenishing valve (14), a second oil replenishing valve (15), a first reversing valve (9), a second reversing valve (10) and an accumulator (16); The P port of the main reversing valve (1) is connected to the hydraulic oil source, the T port thereof is connected to the hydraulic oil tank, the A port of the main reversing valve (1) is connected to the oil inlet of the first balancing valve (7), the oil outlet of the first balancing valve (7) is connected to the A port of the hydraulic winch motor (4), the B port of the main reversing valve (1) is connected to the oil inlet of the second balancing valve (8), the oil outlet of the second balancing valve (8) is connected to the B port of the hydraulic winch motor (4), the control port of the first balancing valve (7) is connected to the oil inlet of the second balancing valve (8), and the control port of the second balancing valve (8) is connected to the oil inlet of the first balancing valve (7); The two comparison ports of the first shuttle valve (11) are respectively connected to the A port and the B port of the main reversing valve (1), and the output port thereof is connected to a comparison port of the second shuttle valve (12). The other comparison port of the second shuttle valve (12) is simultaneously connected to the oil outlet of the sequence valve (13), the control port of the first reversing valve (9), the oil inlet of the first oil replenishing valve (14) and the oil inlet of the second oil replenishing valve (15). The output port of the second shuttle valve (12) is connected to the B port of the second reversing valve (10); The oil outlet of the first oil replenishment valve (14) is connected to the port A of the hydraulic winch motor (4), and the oil outlet of the second oil replenishment valve (15) is connected to the port B of the hydraulic winch motor (4); The port A and the port B of the first reversing valve (9) are respectively connected to the port A and the port B of the hydraulic winch motor (4); The B port of the second reversing valve (10) is connected to the control port at one end thereof, the P port of the second reversing valve (10) is connected to the hydraulic oil tank, the A port thereof is connected to the brake (3), and is also connected to the spring chamber at the other end thereof; the brake (3) is arranged near the hydraulic winch motor (4) and is used to realize a braking operation or a releasing operation of the hydraulic winch motor (4); The P port of the auxiliary reversing valve (2) is connected to the hydraulic oil source, the T port thereof is connected to the hydraulic oil tank, the A port of the auxiliary reversing valve (2) is connected to the rodless chamber oil port of the tensioning cylinder (5), the B port thereof is connected to the oil inlet of the hydraulically controlled one-way valve (6), the oil outlet of the hydraulically controlled one-way valve (6) is connected to the rod chamber oil port of the tensioning cylinder (5), and the hydraulically controlled port of the hydraulically controlled one-way valve (6) is connected to the A port of the auxiliary reversing valve (2); The working oil port of the accumulator (16) is simultaneously connected to the rod chamber oil port of the tensioning oil cylinder (5) and the oil inlet port of the sequence valve (13).

2. A device for rapid tension release without sensor feedback for hydraulic tensioning according to claim 1, characterized in that: It also includes a pressure switch (17) and a relief valve (18), wherein the oil inlet of the pressure switch (17) is connected to the working oil port of the accumulator (16), and the oil outlet is connected to the hydraulic oil tank via the relief valve (18).

3. A hydraulic tensioning sensorless feedback quick release tension device according to claim 1 or 2, characterized in that: It also includes a pressure gauge (19), which is connected to the working oil port of the accumulator (16).

4. A hydraulic tensioning sensorless feedback quick release tension device according to claim 3, characterized in that: The number of the energy accumulators (16) is two.

5. A hydraulic tensioning sensorless feedback quick release tension device according to claim 4, characterized in that: The main reversing valve (1) is a three-position four-way electromagnetic reversing valve. When it is energized and working in the left position, the oil circuit between its P port and B port is connected, and the oil circuit between its T port and A port is connected. When it is de-energized and working in the middle position, its P port is cut off, and the oil circuits between its T port, A port and B port are connected. When it is energized and working in the right position, the oil circuit between its P port and A port is connected, and the oil circuit between its T port and B port is connected.

6. The device for rapid tension release of hydraulic tensioning without sensor feedback according to claim 5, characterized in that: The auxiliary reversing valve (2) is a manual three-position four-way reversing valve. When it is energized and working in the left position, the oil circuit between its P port and its B port is connected, and the oil circuit between its T port and its A port is connected. When it is de-energized and working in the middle position, the oil circuit between its P port and its T port is connected, and its A port and its B port are both blocked. When it is energized and working in the right position, the oil circuit between its P port and its A port is connected, and the oil circuit between its T port and its B port is connected.

7. A hydraulic tensioning sensorless feedback quick release tension device according to claim 6, characterized in that: The first reversing valve (9) is a two-position, two-way hydraulically controlled reversing valve. When it works in the upper position, the oil circuit between its A port and its B port is disconnected. When it works in the lower position, the oil circuit between its A port and its B port is connected.

8. A sensorless feedback quick release tension device for hydraulic tensioning according to claim 7, characterized in that: The second reversing valve (10) is a two-position three-way hydraulically controlled reversing valve. When it works in the left position, the oil circuit between its A port and its B port is disconnected and its P port is blocked. When it works in the right position, the oil circuit between its A port and its P port is connected and its B port is blocked.

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