Novel telescopic cylinder arm pin control system and crane

Abstract

This invention discloses a novel telescopic cylinder arm pin control system, comprising an arm pin control valve, an arm pin control pump, a telescopic cylinder, an arm pin switching valve, a cylinder head body, and an emergency ball valve. The P port of the arm pin control valve body is connected to the oil outlet of the arm pin control pump, the T port is connected to the oil tank, and the B port is connected to the emergency ball valve. The other end of the emergency ball valve is connected to both the arm pin control cylinder and the cylinder pin control cylinder in the cylinder head body. The P′ port is connected to the core tube on the telescopic cylinder, and the other end of the core tube is connected to the P port of the arm pin switching valve. The A port of the arm pin switching valve body is connected to the cylinder pin control cylinder on the cylinder head body, and the B port is connected to the arm pin control cylinder. An electromagnetic proportional relief valve is installed inside the valve body of the arm pin control valve. The inlet of the electromagnetic proportional relief valve is connected to the first oil passage, and the outlet is connected to the return oil passage. This invention can solve the problem of abnormal noise caused by the arm pin being inserted into the arm pin hole. At the same time, it can realize the optional design of two telescopic systems, single-cylinder pin and double-cylinder rope system, under the same vehicle model. The overall modularity is higher and the research and development cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of crane technology, specifically to a novel telescopic cylinder boom pin control system and crane. Background Technology

[0002] The boom extension system of truck cranes mainly comes in two forms: double-cylinder rope system and single-cylinder pin system. The single-cylinder pin system is widely used in medium-to-large tonnage, multi-section booms (six sections and above). The working principle of the single-cylinder pin system is as follows: First, the cylinder head is positioned with the tail of the target boom. Then, the cylinder pin on the cylinder head extends and inserts into the cylinder pin hole at the tail of the target boom. The boom pin control mechanism pulls out the boom pin, releasing the locking between adjacent boom sections. The extension cylinder drives the target boom to the target position, reducing the extension speed. The boom pin control mechanism releases the boom pin in advance, and the top of the boom pin slides against the wall of the adjacent outer boom section until the boom pin aligns with the target boom pin hole. Under the action of the return spring, it inserts into the hole, locking the two boom sections again and completing the extension / retraction action.

[0003] In existing technology, during the movement of the target arm driven by the telescopic cylinder, the arm pin control mechanism drives the dovetail groove of the arm pin to pull the arm pin out, such as... Figure 1 As shown in -b. After completing the telescopic movement, to insert the boom pin into the target boom hole on the adjacent outer section of the target boom, the boom pin needs to be released in advance. Simultaneously, the telescopic cylinder reduces its telescopic speed, causing the target boom to continue moving. At this time, the released boom pin slides against the cylinder wall of the adjacent outer section under the action of the boom pin spring, as shown in -b. Figure 1 As shown in -c. When the arm pin is aligned with the selected arm pin hole, it is pressed into the hole by the arm pin spring, completing the arm pin insertion action, as shown... Figure 1 As shown in -a. Because the arm pin is released in advance, when the arm pin slides along the wall to the insertion hole, it will hit the arm pin limiting structure, producing an impact and a loud noise, which can easily damage the parts.

[0004] In addition, in the existing cylinder boom pin control system, the cylinder boom pin control valve is integrated into the pilot valve group and shares a hydraulic power source with other auxiliary functions (such as slewing, winch braking, etc.). On the one hand, this brings the possibility of mutual interference between actions during compound operations, and on the other hand, it increases the difficulty of troubleshooting. Moreover, the pin-type telescopic boom system differs greatly from the rope-type telescopic boom system in terms of hydraulic system composition and layout. Therefore, it is difficult to meet the design requirements of multiple configuration options for rope-type and pin-type telescopic booms for the same crane product, which increases the research and development cost. Summary of the Invention

[0005] The purpose of this invention is to provide a novel telescopic boom pin control system and crane, so as to solve the problem that the boom pin is prone to impact and loud noise when it moves in the prior art, and can be used in conjunction with the rope-type telescopic system.

[0006] To achieve the above objectives, the present invention discloses a novel telescopic cylinder arm pin control system, comprising an arm pin control valve, an arm pin control pump, a telescopic cylinder, an arm pin switching valve, and a cylinder head body. The P port of the arm pin control valve body is connected to the oil outlet of the arm pin control pump, the T port is connected to the oil tank, the B port is connected to the cylinder head body, and the P′ port is connected to the core tube of the telescopic cylinder. The other end of the core tube is connected to the P port of the arm pin switching valve. The A port of the arm pin switching valve body is connected to the arm pin control cylinder on the cylinder head body, and the B port is connected to the arm pin control cylinder on the cylinder head body.

[0007] The cylinder arm pin control valve has a first oil passage, a second oil passage, a third oil passage, and a return oil passage. Port P is connected to the first oil passage, port B is directly connected to the first oil passage through an oil passage inside the valve body, port A is connected to the second oil passage, port T is connected to the return oil passage, and port P' is connected to the third oil passage. An electromagnetic proportional relief valve is installed inside the valve body of the cylinder arm pin control valve. The inlet of the electromagnetic proportional relief valve is connected to the first oil passage, and the outlet is connected to the return oil passage. In the standby state of the cylinder arm pin control system, the electromagnetic proportional relief valve is set to its minimum pressure. When performing the arm pin release action and the arm extension / retraction action of the telescopic cylinder, the relief pressure of the electromagnetic proportional relief valve is set to its maximum. The cylinder arm pin control valve also has a pressure control valve, which is an electromagnetic directional valve. In its normal position, the second oil passage is connected to the return oil passage through the pressure control valve. When the pressure control valve is energized, the first oil passage is connected to the second oil passage through the pressure control valve.

[0008] Furthermore, it also includes an emergency ball valve, which consists of two parallel manual ball valves. One end of the emergency ball valve is connected to port B on the valve body of the cylinder arm pin control valve, and the other end is connected to the arm pin control cylinder and the cylinder pin control cylinder in the cylinder head body through the two manual ball valves respectively.

[0009] Furthermore, a first check valve is provided on the passage between the P port and the first oil passage on the valve body of the cylinder arm pin control valve. The first check valve only allows oil to flow from the P port to the first oil passage.

[0010] Furthermore, the cylinder arm pin control valve is also equipped with a safety valve, the oil inlet of which is connected to the third oil passage, and the oil outlet of which is connected to the return oil passage.

[0011] Furthermore, a second check valve is provided between the pressure control valve and the return oil passage. The second check valve only allows oil to flow from the second oil passage to the return oil passage.

[0012] Furthermore, a third check valve and a filter are connected in series between the P port and the A port of the cylinder arm pin switching valve. The third check valve allows oil to flow from the A port to the P port.

[0013] Furthermore, an accumulator is also provided on the valve body of the cylinder arm pin control valve, and the accumulator interface is connected to the first oil passage.

[0014] Furthermore, the control system also includes an oil filter located on the oil line connecting the P′ port of the cylinder arm pin control valve and the core tube.

[0015] Furthermore, this control system also includes a return oil shut-off valve, which is located on the pipeline between the A oil port and the P′ oil port.

[0016] On the other hand, the present invention also discloses a crane that adopts the novel telescopic cylinder boom pin control system described above.

[0017] The beneficial effects of this invention are:

[0018] (1) During the process of finding the arm position, the electromagnetic proportional relief valve in the control valve of the telescopic cylinder is controlled to reduce its set pressure in stages, so that the arm pin is gradually released. When the arm pin is inserted into the arm pin hole, it is relatively stable and there will be no violent impact or noise. This can protect the related components and equipment to operate smoothly.

[0019] (2) The cylinder arm pin control valve in the control system of the present invention is independent from the pilot valve in the prior art, which has high reliability and makes fault diagnosis and maintenance more convenient.

[0020] (3) Since the cylinder arm pin control valve is separate, while the telescopic switching valve is placed independently on the turntable in the rope telescopic system, the two have similar layouts. Therefore, it is possible to achieve multiple configuration options for the single-cylinder pin and double-cylinder rope telescopic systems under the same model. The overall modularity is higher, and the R&D cost is reduced. Attached Figure Description

[0021] Figure 1 Arm pin state diagram in the prior art;

[0022] Figure 2 This is a schematic diagram of the telescopic cylinder arm pin control system of the present invention.

[0023] Figure 3 This is a schematic diagram of the cylinder arm pin control valve of the present invention;

[0024] Figure 4 This is a timing diagram of the proportional relief valve pressure control during the release of the arm pin.

[0025] Figure 5 It is inserted into the arm pin hole when the arm pin is partially released.

[0026] In the diagram, 1-cylinder arm pin control valve, 101-first check valve, 102-electromagnetic proportional relief valve, 103-accumulator, 104-pressure control valve, 105-safety valve, 106-second check valve, 107-first oil passage, 108-return oil passage, 109-second oil passage, 110-third oil passage, 2-cylinder arm pin control pump, 3-oil filter, 4-telescopic cylinder, 401-core tube, 5-cylinder arm pin switching valve, 6-cylinder head body, 601-arm pin control cylinder, 602-cylinder pin control cylinder, 603-arm pin control mechanism, 604-cylinder pin control mechanism, 7-emergency ball valve, 8-return oil shut-off ball valve. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 2 As shown, a novel telescopic cylinder arm pin control system includes a cylinder arm pin control valve 1, a cylinder arm pin control pump 2, a telescopic cylinder 4, a cylinder arm pin switching valve 5, a cylinder head body 6, and an emergency ball valve 7. The P port on the valve body of the cylinder arm pin control valve 1 is connected to the oil outlet of the cylinder arm pin control pump 2 through a pipeline, the T port on the valve body is connected to the oil tank, and the B port on the valve body is connected to the emergency ball valve 7 through an external pipeline. The emergency ball valve 7 consists of two parallel manual ball valves. One end of the two ball valves is simultaneously connected to the B port on the valve body of the cylinder arm pin control valve 1, and the other end is respectively connected to the arm pin control cylinder 601 and the cylinder pin control cylinder 602 in the cylinder head 6.

[0029] like Figure 3 As shown, the cylinder arm pin control valve 1 internally has a first oil passage 107, a second oil passage 109, a third oil passage 110, and a return oil passage 108. The P port on the valve body is connected to the first oil passage 107, and a first check valve 101 is installed between them, allowing oil to flow only from the P port to the first oil passage 107. The B port on the valve body is directly connected to the first oil passage 107 through an internal oil passage. The A port on the valve body is connected to the second oil passage 109, the T port on the valve body is connected to the return oil passage 108, and the P' port on the valve body is connected to the third oil passage 110. An electromagnetic proportional relief valve 102 is installed inside the valve body. The inlet of this relief valve is connected to the first oil passage 107, and the outlet is connected to the return oil passage 108. In the standby state of the cylinder arm pin control system, the electromagnetic proportional relief valve 102 is set to the minimum pressure to unload the pressure at the pump port of the cylinder arm pin control pump 2. When performing the arm-pulling pin action and the arm extension / retraction action of the telescopic cylinder, the overflow pressure of the electromagnetic proportional relief valve 102 is set to the maximum.

[0030] A safety valve 105 is installed on the third oil passage 110. The inlet of the safety valve 105 is connected to the third oil passage 110, and the outlet is connected to the return oil passage 108. A pressure control valve 104 is installed inside the cylinder arm pin control valve 1 to control the pressure at port P′. The pressure control valve 104 is a two-position four-way solenoid directional valve. When the pressure control valve 104 is de-energized, the second oil passage 109 is connected to the return oil passage 108 through the pressure control valve 104. A second check valve 106 is installed between the pressure control valve 104 and the return oil passage 108, allowing oil to flow only from the second oil passage 109 to the return oil passage 108. When the pressure control valve 104 is energized, the first oil passage 107 is connected to the second oil passage 109 through the pressure control valve 104. The P′ port on the cylinder arm pin control valve 1 is connected to the core tube 401 on the telescopic cylinder 4 via a pipeline, and an oil filter 3 is installed in the pipeline. The other end of the core tube 401 is connected to the P port of the cylinder arm pin switching valve 5. The cylinder arm pin switching valve 5 also has ports A and B on its valve body. Inside its valve body, ports P and A are connected by an oil passage, and a third check valve and a filter are connected in series between them. The third check valve allows oil to flow from port A to port P. A solenoid directional valve is installed between port P and ports A and B of the cylinder arm pin switching valve 5. When the solenoid directional valve is not energized, port B is connected to port P through the solenoid valve, and the oil passage connecting port A and the valve core is sealed by the solenoid directional valve. When the solenoid directional valve is energized, port A is connected to port P through the solenoid valve, and the oil passage connecting port B and the valve core is sealed by the solenoid directional valve. Port A of the cylinder arm pin switching valve 5 is connected to the cylinder pin control cylinder 602 on the cylinder head body 6 via a pipeline, and port B is connected to the arm pin control cylinder 601.

[0031] During the extension of the telescopic cylinder 4, the volume of the internal cavity of the core tube 401 increases rapidly, thus its internal pressure decreases rapidly. Conversely, during the retraction of the cylinder, the volume of the internal cavity of the core tube 401 decreases rapidly, thus its internal pressure increases rapidly. To address this, an accumulator 103 is installed on the valve body of the cylinder arm pin control valve 1. The accumulator interface is connected to the first oil passage 107 through the oil passage inside the valve body. During the extension and retraction of the telescopic cylinder 4, the system is replenished with oil or excess oil is absorbed to maintain a relatively stable pressure in the cylinder arm pin control system.

[0032] The A port and P′ port of the cylinder arm pin control valve 1 are connected externally to the valve body via a pipeline. When using the emergency ball valve 7, the oil flows from the B port of the cylinder arm pin control valve 1 through the emergency ball valve 7 into the cylinder arm pin control cylinder 601 or 602. To prevent the oil in the emergency oil circuit from flowing directly into the internal return oil passage 108 for pressure relief via the pipeline, cylinder arm pin switching valve 5, core tube 401, and the A port of the cylinder arm pin control valve 1, a return oil shut-off ball valve 8 is installed on the pipeline between the A port and the P′ port. In emergency situations, the return oil shut-off ball valve 8 should be closed first, and then the cylinder pin control ball valve or the cylinder arm pin control ball valve in the emergency ball valve 7 should be opened.

[0033] To prevent the oil from flowing back into the cylinder arm pin control valve 1 due to the increased pressure in the core tube during the cylinder retraction process, and to prevent iron filings and other debris from being carried into the cylinder arm pin control valve 1, an oil filter 3 is installed on the oil line connecting the P′ port of the cylinder arm pin control valve 1 and the core tube 401. The oil filter is installed between the connection point of the A port and the P′ port and the connection point of the P′ port and the core tube 401.

[0034] The control principle of the insert pin in this control system will be explained in detail below:

[0035] When the boom extension pin and boom cylinder are engaged in boom extension and retraction, the electromagnetic proportional relief valve 102 is set to the maximum pressure, the pressure control valve 104 is energized, and the boom pin switching valve 5 is de-energized. The high-pressure oil from the boom pin control pump 2 passes through the first oil passage 107 and is connected to the second oil passage 109 via the pressure control valve 104. The oil can enter the second oil passage 109, and then pass through the return oil shut-off valve 8 and the oil filter 3 to one end of the core tube 401. After flowing out from the other end of the core tube 401, the P port and B port of the boom pin switching valve 5 are connected, and the oil can enter the boom pin control cylinder 601 through this oil passage, pushing the boom pin control cylinder 601 forward.

[0036] After the cylinder pin is inserted into the cylinder pin hole at the tail of the target boom under the control of the cylinder pin control mechanism 604, the boom pin is pulled out by the boom pin control mechanism 603. When the boom pin at the tail of the target boom approaches the selected boom pin hole on the adjacent outer boom, the telescopic cylinder 4 decelerates and continues to telescopic, while the electromagnetic proportional relief valve 102 reduces the set pressure by a portion, such as... Figure 4 As shown, starting at time t1, the set pressure of the proportional relief valve decreases from its maximum value Pmax to PL. At this time, due to the pressure reduction, the cylinder rod of the arm pin control cylinder 601 will retract partially. The arm pin release mechanism drives the dovetail groove of the arm pin to move upward a certain distance, disengaging the dovetail groove from the arm pin. The telescopic cylinder 4 continues to move at low speed, and the arm pin slides close to the adjacent outer section of the arm cylinder wall. After aligning with the selected arm pin hole, the arm pin spring presses it into the arm pin hole. However, because there is still some pressure inside the arm pin control cylinder 601, the arm pin will not be completely released, and the arm pin will not collide with the arm pin limiting structure. Figure 5 As shown. After confirming that the arm pin has been inserted into the arm pin hole, gradually reduce the set pressure of the electromagnetic proportional relief valve 102 to the minimum value, as shown. Figure 4 As shown at time t2, the arm pin is fully released, completing the arm pin insertion action. Because the arm pin is released gradually during this process, the impact of the arm pin into the arm pin hole on the arm pin limiting structure will not produce a violent impact or noise, thus ensuring the service life of the component.

[0037] In existing cylinder arm pin control systems, the cylinder arm pin control valve 1 is integrated into an auxiliary valve, sharing a single oil source with other auxiliary functions (such as slewing and winch braking). This introduces the possibility of mutual interference during compound actions and increases the difficulty of troubleshooting. In contrast, the oil circuit of this cylinder arm pin control system is independent of the main valve oil circuit, slewing action oil circuit, pilot oil circuit, and auxiliary action oil circuit, resulting in high reliability and easier troubleshooting and repair.

[0038] In this control system, the cylinder arm pin control valve 1 is separated from the pilot valve in the prior art, and the layout is similar to that of a common double-cylinder rope system. Therefore, multiple configuration designs of double-cylinder rope system and single-cylinder pin-type telescopic system can be carried out on the same model product, which increases the flexibility of product design and reduces product development costs.

[0039] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes that can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention are all within the protection scope of the claims of the present invention.

Claims

1. A novel telescopic cylinder arm pin control system, characterized in that, Includes cylinder arm pin control valve (1), cylinder arm pin control pump (2), telescopic cylinder (4), cylinder arm pin switching valve (5), and cylinder head body (6), among which, The P port on the valve body of the cylinder arm pin control valve (1) is connected to the oil outlet of the cylinder arm pin control pump (2), the T port is connected to the oil tank, the B port is connected to the cylinder head body (6), the P' port is connected to the core tube (401) on the telescopic cylinder (4), and the other end of the core tube (401) is connected to the P port of the cylinder arm pin switching valve (5); the A port on the valve body of the cylinder arm pin switching valve (5) is connected to the cylinder pin control cylinder (602) on the cylinder head body (6), and the B port is connected to the arm pin control cylinder (601) on the cylinder head body (6); The cylinder arm pin control valve (1) is internally provided with a first oil passage (107), a second oil passage (109), a third oil passage (110), and a return oil passage (108). Port P is connected to the first oil passage (107), port B is directly connected to the first oil passage (107) through an oil passage inside the valve body, port A is connected to the second oil passage (109), port T is connected to the return oil passage (108), and port P' is connected to the third oil passage (110). The cylinder arm pin control valve (1) is internally provided with an electromagnetic proportional relief valve (102). The inlet of the electromagnetic proportional relief valve (102) is connected to the first oil passage (107), and the outlet is connected to the return oil passage (108). In the standby state of the cylinder arm pin control system, the electromagnetic proportional relief valve (102) is set to the minimum pressure. When performing the arm pin pulling action and the telescopic cylinder arm extension and retraction action, the relief pressure of the electromagnetic proportional relief valve (102) is set to the maximum. The cylinder arm pin control valve (1) is also equipped with a pressure control valve (104). The pressure control valve (104) is an electromagnetic directional valve. In the normal position state, the second oil passage (109) is connected to the return oil passage (108) through the pressure control valve (104). When the pressure control valve (104) is energized, the first oil passage (107) is connected to the second oil passage (109) through the pressure control valve (104). When the arm pin at the tail of the target arm approaches the selected arm pin hole on the adjacent outer arm, the telescopic cylinder (4) decelerates and continues to extend and retract, while the set pressure of the electromagnetic proportional relief valve (102) is reduced by a portion; after confirming that the arm pin has been inserted into the arm pin hole, the set pressure of the electromagnetic proportional relief valve (102) is gradually reduced to the minimum value.

2. The novel telescopic cylinder arm pin control system according to claim 1, characterized in that, It also includes an emergency ball valve (7), which consists of two parallel manual ball valves. One end of the ball valve is connected to port B on the valve body of the cylinder arm pin control valve (1), and the other end is connected to the arm pin control cylinder (601) and the cylinder pin control cylinder (602) in the cylinder head body (6) through the two manual ball valves respectively.

3. The novel telescopic cylinder arm pin control system according to claim 1, characterized in that, A first check valve (101) is provided on the passage between the P port on the valve body of the cylinder arm pin control valve (1) and the first oil passage (107). The first check valve (101) only allows oil to flow from the P port to the first oil passage (107).

4. A novel telescopic cylinder arm pin control system according to claim 1, characterized in that, The cylinder arm pin control valve (1) is also equipped with a safety valve (105). The oil inlet of the safety valve (105) is connected to the third oil passage (110), and the oil outlet is connected to the return oil passage (108).

5. A novel telescopic cylinder arm pin control system according to claim 1, characterized in that, A second check valve (106) is provided between the pressure control valve (104) and the return oil passage (108). The second check valve (106) only allows oil to flow from the second oil passage (109) to the return oil passage (108).

6. A novel telescopic cylinder arm pin control system according to claim 1, characterized in that, A third check valve and a filter are connected in series between the P port and the A port of the cylinder arm pin switching valve (5). The third check valve allows oil to flow from the A port to the P port.

7. A novel telescopic cylinder arm pin control system according to claim 1, characterized in that, An accumulator (103) is also provided on the valve body of the cylinder arm pin control valve (1), and the interface of the accumulator (103) is connected to the first oil passage (107).

8. A novel telescopic cylinder arm pin control system according to claim 1, characterized in that, It also includes an oil filter (3), which is located on the oil line where the P' port of the cylinder arm pin control valve (1) is connected to the core tube (401).

9. A novel telescopic cylinder arm pin control system according to claim 1, characterized in that, It also includes a return oil shut-off ball valve (8), which is located on the pipeline between port A and port P'.

10. A crane, characterized in that, The novel telescopic cylinder arm pin control system described in any one of claims 1-9 is adopted.

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