An emergency hydraulic pump station for a scotch yoke hydraulic steering gear

Abstract

The invention relates to an emergency hydraulic pump station for a scotch yoke type hydraulic steering gear, comprising a two-way pump, a servo pump, a No. 1 three-position four-way valve, a No. 2 three-position four-way valve, a double-rod oil cylinder, and an oil tank. On the one hand, two-way oil discharge switching control of the two-way pump is realized by the servo pump, the double-rod oil cylinder, and the No. 2 three-position four-way valve. On the other hand, the hydraulic oil output by the two-way pump automatically drives the No. 1 three-position four-way valve to reverse, thereby realizing self-reversing control of the oil circuit. The two-way oil discharge switching control of the two-way pump is combined with the self-reversing control of the oil circuit, so that only one two-way pump and one set of hydraulic oil circuits are required to meet the steering direction switching of the scotch yoke type hydraulic steering gear, thereby improving the degree of integration and reducing the space occupied by the hydraulic pump station.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydraulic control systems, and in particular relates to an emergency hydraulic pump station for a scotch yoke type hydraulic steering gear. Background Art

[0002] A hydraulic steering gear is a device used to control or change a ship's course. It's typically installed in the aft compartment of a vessel. A hydraulic pump pumps hydraulic oil to control the extension and retraction of the hydraulic cylinder's piston rod. This, in turn, rotates the rudder shaft through the tiller's shift fork, which in turn rotates the rudder blades connected to the tiller, thereby achieving steering. However, the emergency hydraulic pumps for hydraulic steering gears are often manually operated, resulting in inefficient steering.

[0003] The utility model patent application number CN201320401842.9 discloses a scotch yoke type hydraulic steering gear experimental teaching device, which includes two hydraulic pumps, a control box, an electromagnetic reversing valve, a hydraulic oil pipeline, a hydraulic telescopic cylinder, a rudder shaft and a rudder blade, and can realize all the functions of a marine scotch yoke type hydraulic steering gear; although the device controls the operation of the pump group through the control box, which can save labor costs, in order to achieve reversing, the device uses two sets of pump groups, which requires the two sets of pump groups to be equipped with corresponding motors, control valve groups and oil pipelines, resulting in a low degree of integration and a large volume occupied by the entire hydraulic pump station. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to provide an emergency hydraulic pump station for a scotch yoke hydraulic steering gear with a self-reversing steering direction function and a high degree of integration.

[0005] To achieve the above objectives, the technical solutions of the present invention are as follows:

[0006] An emergency hydraulic pump station for a scotch yoke hydraulic steering gear, comprising a bidirectional pump, a servo pump, a No. 1 three-position four-way valve, a No. 2 three-position four-way valve, a double-rod oil cylinder, and an oil tank;

[0007] The number one three-position four-way valve includes an A1 port, an A2 port, a B1 port, a B2 port, a first control oil port, and a second control oil port. The two-way pump has a first oil outlet, a second oil outlet, and a third oil port. The third oil port is connected to the oil tank. The first oil outlet is connected to the A1 port and the first control oil port of the number one three-position four-way valve. The second oil outlet is connected to the A2 port and the second control oil port of the number one three-position four-way valve. The B1 port of the number one three-position four-way valve is connected to the first hydraulic cylinder and the third hydraulic cylinder in the scotch fork hydraulic steering gear. The B2 port of the number one three-position four-way valve is connected to the second hydraulic cylinder and the fourth hydraulic cylinder in the scotch fork hydraulic steering gear.

[0008] The No. 1, 3-position four-way valve works in the left position when control oil is introduced into the first control oil port. At this time, the oil circuit from the A1 port of the No. 1, 3-position four-way valve to the B1 port of the No. 1, 3-position four-way valve is connected, and the A2 port of the No. 1, 3-position four-way valve is connected to the B2 port of the No. 1, 3-position four-way valve. When the control oil is introduced into the second control oil port A2, the No. 1, 3-position four-way valve works in the right position. At this time, the oil circuit from the A2 port of the No. 1, 3-position four-way valve to the B2 port of the No. 1, 3-position four-way valve is connected, and the A1 port of the No. 1, 3-position four-way valve is connected to the B1 port of the No. 1, 3-position four-way valve;

[0009] The No. 2 three-position four-way valve includes a P port, an A port, a B port, and a T port. The P port of the No. 2 three-position four-way valve is connected to the oil outlet of the servo pump, the A port of the No. 2 three-position four-way valve is connected to the A cavity of the double-rod oil cylinder, the B port of the No. 2 three-position four-way valve is connected to the B cavity of the double-rod oil cylinder, and the T port of the No. 2 three-position four-way valve is connected to the oil tank;

[0010] The second three-position four-way valve can be switched to the left position or the right position to work. When working in the left position, the P port of the second three-position four-way valve is connected to the A port. When working in the right position, the P port of the second three-position four-way valve is connected to the B port.

[0011] The double-rod oil cylinder is used to adjust the oil supply direction of the bidirectional pump.

[0012] The emergency hydraulic pump station also includes a three-position two-way valve, which includes a P1 port, a P2 port, a third control oil port, and a fourth control oil port. The P1 port and P2 port of the three-position two-way valve are respectively connected to the first oil outlet and the second oil outlet of the two-way pump, and the third control oil port and the fourth control oil port are respectively connected to the A port and the B port of the No. 2 three-position four-way valve. The third control oil port and the fourth control oil port are both used to cut off the oil circuit between the P1 port and the P2 port of the three-position two-way valve when the control oil is introduced.

[0013] The emergency hydraulic pump station further comprises a double-shaft extension motor, wherein a first output end and a second output end of the double-shaft extension motor are respectively connected to a bidirectional pump and a servo pump in a transmission manner.

[0014] The emergency hydraulic pump station also includes a No. 1 filter, and the third oil port and the T port of the No. 2 three-position four-way valve are both connected to the oil tank through the No. 1 filter.

[0015] The emergency hydraulic pump station also includes a No. 2 filter, and the oil inlet of the servo pump is connected to the oil tank through the No. 2 filter.

[0016] The emergency hydraulic pump station further comprises a safety overflow valve, which is arranged on the bidirectional pump.

[0017] The emergency hydraulic pump station also includes a one-way valve, and the oil outlet of the servo pump is connected to the P port of the No. 2 three-position four-way valve through the one-way valve.

[0018] The bidirectional pump is a bidirectional quantitative pump.

[0019] The emergency hydraulic pump station further includes a controller, which is connected to the No. 2 three-position four-way valve signal and is used to control the No. 2 three-position four-way valve to switch to the left position or the right position for operation.

[0020] The piston rod of the double-rod oil cylinder is connected to the swash plate of the bidirectional pump.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The emergency hydraulic pump station described in the present invention includes a two-way pump, a servo pump, a No. 1 three-position four-way valve, a No. 2 three-position four-way valve, a double-rod oil cylinder, and an oil tank; on the one hand, the two-way oil discharge switching control of the two-way pump is realized by the servo pump, the double-rod oil cylinder, and the No. 2 three-position four-way valve; on the other hand, the hydraulic oil output by the two-way pump automatically drives the No. 1 three-position four-way valve to reverse, thereby realizing self-reversing control of the oil circuit; the two-way oil discharge switching control of the two-way pump is combined with the self-reversing control of the oil circuit, so that only one two-way pump and a set of hydraulic oil circuits are required to meet the steering direction switching of the scotch fork hydraulic steering gear, thereby improving the degree of integration and reducing the space occupied by the hydraulic pump station.

[0023] 2. The emergency hydraulic pump station of the present invention also includes a double-shaft extension motor, which is used to simultaneously provide power for the bidirectional pump and the servo pump, saving the number of system motors, making the integration higher and the hydraulic pump station smaller.

[0024] 3. The emergency hydraulic pump station described in the present invention also includes a three-position two-way valve, which includes a P1 port, a P2 port, a third control oil port, and a fourth control oil port. The third control oil port and the fourth control oil port are connected to the A port and the B port respectively; when the system is not working, the oil circuit between the P1 port and the P2 port of the three-position two-way valve is connected, so that the inlet and outlet oil circuits of the two-way pump are connected, ensuring the absolute zero position of the two-way pump and ensuring the stability of the system; when the system is working, the control oil is introduced into the third control oil port or the fourth control oil port, which automatically drives the three-position two-way valve to reverse, and cuts off the oil circuit between the P1 port and the P2 port of the three-position two-way valve, ensuring the normal operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the principle of the present invention.

[0026] In the above figure, two-way pump 1, first oil outlet 11, second oil outlet 12, third oil port 13, servo pump 2, No. 1 three-position four-way valve 3, first control oil port 31, second control oil port 32, No. 2 three-position four-way valve 4, double-rod cylinder 5, A cavity 51, B cavity 52, oil tank 6, three-position two-way valve 7, third control oil port 71, fourth control oil port 72, double-axle extension motor 8, No. 1 filter 81, No. 2 filter 82, safety overflow valve 83, one-way valve 84, controller 85, first hydraulic cylinder 86, second hydraulic cylinder 87, third hydraulic cylinder 88, fourth hydraulic cylinder 89. DETAILED DESCRIPTION

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

[0028] See also Figure 1 , an emergency hydraulic pump station for a scotch yoke type hydraulic steering gear, comprising a bidirectional pump 1, a servo pump 2, a No. 1 three-position four-way valve 3, a No. 2 three-position four-way valve 4, a double-rod oil cylinder 5, and an oil tank 6;

[0029] The number one three-position four-way valve 3 includes an A1 port, an A2 port, a B1 port, a B2 port, a first control oil port 31, and a second control oil port 32. The bidirectional pump 1 has a first oil outlet 11, a second oil outlet 12, and a third oil port 13. The third oil port 13 is connected to the fuel tank 6. The first oil outlet 11 is connected to the A1 port and the first control oil port 31 of the number one three-position four-way valve 3. The second oil outlet 12 is connected to the A2 port and the second control oil port 32 of the number one three-position four-way valve 3. The B1 port of the number one three-position four-way valve 3 is connected to the first hydraulic cylinder 86 and the third hydraulic cylinder 88 in the scotch fork hydraulic steering gear. The B2 port of the number one three-position four-way valve 3 is connected to the second hydraulic cylinder 87 and the fourth hydraulic cylinder 89 in the scotch fork hydraulic steering gear.

[0030] The number one, three-position four-way valve 3 works in the left position when the control oil is introduced into the first control oil port 31. At this time, the oil path from the A1 port of the number one, three-position four-way valve 3 to the B1 port of the number one, three-position four-way valve 3 is connected, and the A2 port of the number one, three-position four-way valve 3 is connected to the B2 port of the number one, three-position four-way valve 3. When the control oil is introduced into the second control oil port 32, the number one, three-position four-way valve 3 works in the right position. At this time, the oil path from the A2 port of the number one, three-position four-way valve 3 to the B2 port of the number one, three-position four-way valve 3 is connected, and the A1 port of the number one, three-position four-way valve 3 is connected to the B1 port of the number one, three-position four-way valve 3.

[0031] The No. 2, 3-position, four-way valve 4 includes a P port, an A port, a B port, and a T port. The P port of the No. 2, 3-position, four-way valve 4 is connected to the oil outlet of the servo pump 2, the A port of the No. 2, 3-position, four-way valve 4 is connected to the A cavity 51 of the double-rod oil cylinder 5, the B port of the No. 2, 3-position, four-way valve 4 is connected to the B cavity 52 of the double-rod oil cylinder 5, and the T port of the No. 2, 3-position, four-way valve 4 is connected to the oil tank 6;

[0032] The second three-position four-way valve 4 can be switched to the left position or the right position to work. When working in the left position, the P port of the second three-position four-way valve 4 is connected to the A port. When working in the right position, the P port of the second three-position four-way valve 4 is connected to the B port.

[0033] The double-rod oil cylinder 5 is used to adjust the oil supply direction of the bidirectional pump 1 .

[0034] The emergency hydraulic pump station also includes a three-position two-way valve 7, which includes a P1 port, a P2 port, a third control oil port 71, and a fourth control oil port 72. The P1 port and P2 port of the three-position two-way valve 7 are respectively connected to the first oil outlet 11 and the second oil outlet 12 of the two-way pump 1, and the third control oil port 71 and the fourth control oil port 72 are respectively connected to the A port and the B port of the No. 2 three-position four-way valve 4. The third control oil port 71 and the fourth control oil port 72 are both used to cut off the oil circuit between the P1 port and the P2 port of the three-position two-way valve 7 when the control oil is introduced.

[0035] The emergency hydraulic pump station further comprises a double-shaft extension motor 8 , wherein a first output end and a second output end of the double-shaft extension motor 8 are transmission-connected to the bidirectional pump 1 and the servo pump 2 respectively.

[0036] The emergency hydraulic pump station further includes a No. 1 filter 81 , and the third oil port 13 and the T port of the No. 2 three-position four-way valve 4 are both connected to the oil tank 6 through the No. 1 filter 81 .

[0037] The emergency hydraulic pump station further includes a No. 2 filter 82 , and the oil inlet of the servo pump 2 is connected to the oil tank 6 through the No. 2 filter 82 .

[0038] The emergency hydraulic pump station further includes a safety overflow valve 83 , which is provided on the bidirectional pump 1 .

[0039] The emergency hydraulic pump station further includes a one-way valve 84 , and the oil outlet of the servo pump 2 is connected to the P port of the No. 2 three-position four-way valve 4 through the one-way valve 84 .

[0040] The bidirectional pump 1 is a bidirectional quantitative pump.

[0041] The emergency hydraulic pump station further includes a controller 85 , which is signal-connected to the No. 2 three-position four-way valve 4 and is used to control the No. 2 three-position four-way valve 4 to switch to the left position or the right position.

[0042] The piston rod of the double-rod oil cylinder 5 is connected to the swash plate of the bidirectional pump 1 .

[0043] Example 1:

[0044] See also Figure 1 , an emergency hydraulic pump station for a scotch fork hydraulic steering gear, comprising a two-way pump 1, a servo pump 2, a number one three-position four-way valve 3, a number two three-position four-way valve 4, a double-rod oil cylinder 5, and an oil tank 6; the number one three-position four-way valve 3 includes an A1 port, an A2 port, a B1 port, a B2 port, a first control oil port 31, and a second control oil port 32; the two-way pump 1 has a first oil outlet 11, a second oil outlet 12, and a third oil port 13; the third oil port 13 is connected to the oil tank 6; the first oil outlet 11 is connected to the A1 port and the first control oil port 31 of the number one three-position four-way valve 3; the second oil outlet 12 is connected to the A1 port of the number one three-position four-way valve 3 2 port and the second control oil port 32 are connected, the B1 port of the No. 1, 3, 4-way valve 3 is connected to the first hydraulic cylinder 86 and the third hydraulic cylinder 88 in the sled hydraulic steering gear, and the B2 port of the No. 1, 3, 4-way valve 3 is connected to the second hydraulic cylinder 87 and the fourth hydraulic cylinder 89 in the sled hydraulic steering gear; the No. 1, 3, 4-way valve 3 works in the left position when the control oil is introduced into the first control oil port 31. At this time, the oil circuit from the A1 port of the No. 1, 3, 4-way valve 3 to the B1 port of the No. 1, 3, 4-way valve 3 is connected, and the A2 port of the No. 1, 3, 4-way valve 3 is connected to the B2 port of the No. 1, 3, 4-way valve 3, and the oil circuit from the A1 port of the No. 1, 3, 4-way valve 3 to the B1 port of the No. 1, 3, 4-way valve 3 is connected. The oil circuit connection from the port to the B1 port of the No. 1 three-position four-way valve 3 specifically refers to the connection through the one-way valve set in the left position; the No. 1 three-position four-way valve 3 works in the right position when the control oil is introduced into the second control oil port 32. At this time, the oil circuit from the A2 port of the No. 1 three-position four-way valve 3 to the B2 port of the No. 1 three-position four-way valve 3 is connected, and the A1 port of the No. 1 three-position four-way valve 3 is connected to the B1 port of the No. 1 three-position four-way valve 3. The oil circuit connection from the A2 port of the No. 1 three-position four-way valve 3 to the B2 port of the No. 1 three-position four-way valve 3 specifically refers to the connection through the one-way valve set in the right position; the No. 2 three-position four-way valve 4 includes the P port, the A port, the B port, and the T port, and the No. 2 three-position four-way valve 4 The P port is connected with the oil outlet of the servo pump 2, the A port of the No. 2, three-position four-way valve 4 is connected with the A cavity 51 of the double-rod oil cylinder 5, the B port of the No. 2, three-position four-way valve 4 is connected with the B cavity 52 of the double-rod oil cylinder 5, and the T port of the No. 2, three-position four-way valve 4 is connected with the oil tank 6; the No. 2, three-position four-way valve 4 can be switched to the left position or the right position to work. When working in the left position, the P port of the No. 2, three-position four-way valve 4 is connected with the A port, and when working in the right position, the P port of the No. 2, three-position four-way valve 4 is connected with the B port; the piston rod of the double-rod oil cylinder 5 is connected with the swash plate of the bidirectional pump 1, and the oil supply direction of the bidirectional pump 1 is adjusted by adjusting the inclination direction of the swash plate of the bidirectional pump 1.

[0045] The working principle of the above emergency hydraulic pump station is:

[0046] When the system is not working, the servo pump 2 is not working or idling, the two-way pump 1 does not discharge oil, and no hydraulic oil is input to the No. 1 three-position four-way valve 3. At this time, the No. 1 three-position four-way valve 3 is in the middle position, and two one-way valves are provided in the middle position to prevent the hydraulic oil in the hydraulic cylinder of the scotch yoke hydraulic steering gear from flowing back to the two-way pump 1 due to external force;

[0047] When the system is working and the scotch fork hydraulic steering gear needs to rotate clockwise, the left position of the No. 2 three-position four-way valve 4 is operated by external signal or manual control. At this time, the P port of the No. 2 three-position four-way valve 4 is connected to the A port, and the hydraulic oil output by the servo pump 2 passes through the P port of the No. 2 three-position four-way valve 4 and the A port of the No. 2 three-position four-way valve 4 in turn and enters the A chamber 51 of the double-rod cylinder 5. The hydraulic oil in the B chamber 52 of the double-rod cylinder 5 passes through the B port and the T port of the No. 2 three-position four-way valve 4 in turn and flows back to the oil tank 6. The piston of the double-rod cylinder 5 moves from the A chamber 51 to the B chamber 52, driving the swash plate of the two-way pump 1 to tilt to one side, and adjusting the two-way pump 1 to discharge oil from the first oil outlet 11 and return oil from the second oil outlet 12. The hydraulic oil output by the first oil outlet 11 of the two-way pump 1 is divided into two paths. One path is used as control oil and enters the first control oil port 31 of the No. 1, three-position, four-way valve 3, so that the No. 1, three-position, four-way valve 3 is turned to the left position. When the No. 1, three-position, four-way valve 3 is working in the left position, the oil path from port A1 to port B1 is connected, and port A2 is connected to port B2; the other path of hydraulic oil passes through port A1 and port B1 of the No. 1, three-position, four-way valve 3 in turn and enters the first hydraulic cylinder 86 and the third hydraulic cylinder 88, driving the fork-type hydraulic steering gear to rotate clockwise. The hydraulic oil in the second hydraulic cylinder 87 and the fourth hydraulic cylinder 89 passes through port A2 and port B2 of the No. 1, three-position, four-way valve 3 and the second oil outlet 12 in turn and then flows back to the oil tank 6.

[0048] When the system is working and the scotch fork hydraulic steering gear needs to rotate counterclockwise, the right position of the No. 2 three-position four-way valve 4 is operated by external signal or manual control. At this time, the P port and the B port of the No. 2 three-position four-way valve 4 are connected, and the hydraulic oil output by the servo pump 2 passes through the P port and the B port of the No. 2 three-position four-way valve 4 in turn and enters the B chamber 52 of the double-rod cylinder 5. The hydraulic oil in the A chamber 51 of the double-rod cylinder 5 passes through the A port and the T port of the No. 2 three-position four-way valve 4 in turn and flows back to the oil tank 6. The piston of the double-rod cylinder 5 moves from the B chamber 52 to the A chamber 51, driving the swash plate of the two-way pump 1 to tilt to the other side, and adjusting the two-way pump 1 to output oil from the second oil outlet 12 and return oil to the first oil outlet 11. The hydraulic oil output by the second oil outlet 12 of the two-way pump 1 is divided into two paths. One path is used as control oil and enters the second control oil port 32 of the No. 1, three-position, four-way valve 3, so that the No. 1, three-position, four-way valve 3 is turned to the right position. When the No. 1, three-position, four-way valve 3 is working in the right position, the oil path from port A2 to port B2 is connected, and port A1 is connected to port B1; the other path of hydraulic oil passes through port A2 and port B2 of the No. 1, three-position, four-way valve 3 in turn and enters the second hydraulic cylinder 87 and the fourth hydraulic cylinder 89, driving the fork-type hydraulic steering gear to rotate counterclockwise. The hydraulic oil in the first hydraulic cylinder 86 and the third hydraulic cylinder 88 passes through port A1 and port B1 of the No. 1, three-position, four-way valve 3 and the first oil outlet 11 in turn and then flows back to the oil tank 6.

[0049] The above-mentioned emergency hydraulic pump station can not only be used to realize the steering direction switching function of the scotch yoke hydraulic steering gear, but can also be applied to other hydraulic systems with reciprocating motion that have the same or similar motion mode as the scotch yoke steering actuator.

[0050] Example 2:

[0051] The difference from Example 1 is that:

[0052] The bidirectional pump 1 is a bidirectional quantitative pump. The emergency hydraulic pump station further includes a controller 85 , which is signal-connected to the No. 2 three-position four-way valve 4 and is used to control the No. 2 three-position four-way valve 4 to switch to the left position or the right position.

[0053] Example 3:

[0054] The difference from Example 1 is that:

[0055] The emergency hydraulic pump station also includes a three-position two-way valve 7, which includes a P1 port, a P2 port, a third control oil port 71, and a fourth control oil port 72. The P1 port and P2 port of the three-position two-way valve 7 are respectively connected to the first oil outlet 11 and the second oil outlet 12 of the two-way pump 1, and the third control oil port 71 and the fourth control oil port 72 are respectively connected to the A port and the B port of the No. 2 three-position four-way valve 4. The third control oil port 71 and the fourth control oil port 72 are both used to cut off the oil circuit between the P1 port and the P2 port of the three-position two-way valve 7 when the control oil is introduced.

[0056] Example 4:

[0057] The difference from Example 1 is that:

[0058] The emergency hydraulic pump station further comprises a double-shaft extension motor 8 , wherein a first output end and a second output end of the double-shaft extension motor 8 are transmission-connected to the bidirectional pump 1 and the servo pump 2 respectively.

[0059] Example 5:

[0060] The difference from Example 1 is that:

[0061] The emergency hydraulic pump station also includes a No. 1 filter 81, a No. 2 filter 82, a safety overflow valve 83, and a one-way valve 84. The third oil port 13 and the T port of the No. 2 three-position four-way valve 4 are both connected to the oil tank 6 through the No. 1 filter 81. The oil inlet of the servo pump 2 is connected to the oil tank 6 through the No. 2 filter 82. The safety overflow valve 83 is arranged on the bidirectional pump 1. The oil outlet of the servo pump 2 is connected to the P port of the No. 2 three-position four-way valve 4 through the one-way valve 84.

Claims

1. An emergency hydraulic pump station for a scotch yoke hydraulic steering gear, characterized by: It includes a two-way pump (1), a servo pump (2), a No. 1 three-position four-way valve (3), a No. 2 three-position four-way valve (4), a double-rod oil cylinder (5), and an oil tank (6); The number one three-position four-way valve (3) comprises an A1 port, an A2 port, a B1 port, a B2 port, a first control oil port (31), and a second control oil port (32); the two-way pump (1) comprises a first oil outlet (11), a second oil outlet (12), and a third oil port (13); the third oil port (13) is connected to the oil tank (6); the first oil outlet (11) is connected to the A1 port and the first control oil port (31) of the number one three-position four-way valve (3); the second oil outlet (12) is connected to the A2 port and the second control oil port (32) of the number one three-position four-way valve (3); the B1 port of the number one three-position four-way valve (3) is connected to the first hydraulic cylinder and the third hydraulic cylinder in the shift fork type hydraulic steering gear; the B2 port of the number one three-position four-way valve (3) is connected to the second hydraulic cylinder and the fourth hydraulic cylinder in the shift fork type hydraulic steering gear; The first three-position four-way valve (3) works in the left position when the control oil is introduced into the first control oil port (31), at which time the oil path from the A1 port of the first three-position four-way valve (3) to the B1 port of the first three-position four-way valve (3) is connected, and the A2 port of the first three-position four-way valve (3) is connected to the B2 port of the first three-position four-way valve (3); the first three-position four-way valve (3) works in the right position when the control oil is introduced into the second control oil port (32), at which time the oil path from the A2 port of the first three-position four-way valve (3) to the B2 port of the first three-position four-way valve (3) is connected, and the A1 port of the first three-position four-way valve (3) is connected to the B1 port of the first three-position four-way valve (3); The second three-position four-way valve (4) comprises a P port, an A port, a B port, and a T port. The P port of the second three-position four-way valve (4) is connected to the oil outlet of the servo pump (2), the A port of the second three-position four-way valve (4) is connected to the A cavity of the double-rod oil cylinder (5), the B port of the second three-position four-way valve (4) is connected to the B cavity of the double-rod oil cylinder (5), and the T port of the second three-position four-way valve (4) is connected to the oil tank (6); The second three-position four-way valve (4) can be switched to the left position or the right position for operation. When the second three-position four-way valve (4) is in the left position, the P port is connected to the A port. When the second three-position four-way valve (4) is in the right position, the P port is connected to the B port. The double-rod oil cylinder (5) is used to adjust the oil supply direction of the bidirectional pump (1).

2. The emergency hydraulic pump station for a scotch yoke hydraulic steering gear according to claim 1, characterized in that: The emergency hydraulic pump station further comprises a three-position two-way valve (7), the three-position two-way valve (7) comprising a P1 port, a P2 port, a third control oil port (71), and a fourth control oil port (72). The P1 port and the P2 port of the three-position two-way valve (7) are respectively connected to the first oil outlet (11) and the second oil outlet (12) of the bidirectional pump (1). The third control oil port (71) and the fourth control oil port (72) are respectively connected to the A port and the B port of the second three-position four-way valve (4). The third control oil port (71) and the fourth control oil port (72) are both used to cut off the oil circuit between the P1 port and the P2 port of the three-position two-way valve (7) when the control oil is introduced.

3. An emergency hydraulic pump station for a scotch yoke hydraulic steering gear according to claim 1 or 2, characterized in that: The emergency hydraulic pump station further comprises a double-shaft extension motor (8), wherein a first output end and a second output end of the double-shaft extension motor (8) are respectively connected to the bidirectional pump (1) and the servo pump (2) in a transmission manner.

4. An emergency hydraulic pump station for a scotch yoke hydraulic steering gear according to claim 1 or 2, characterized in that: The emergency hydraulic pump station further includes a No. 1 filter (81), and the third oil port (13) and the T port of the No. 2 three-position four-way valve (4) are both connected to the oil tank (6) through the No. 1 filter (81).

5. An emergency hydraulic pump station for a scotch yoke hydraulic steering gear according to claim 1 or 2, characterized in that: The emergency hydraulic pump station further comprises a No. 2 filter (82), and the oil inlet of the servo pump (2) is connected to the oil tank (6) via the No. 2 filter (82).

6. An emergency hydraulic pump station for a scotch yoke hydraulic steering gear according to claim 1 or 2, characterized in that: The emergency hydraulic pump station further comprises a safety overflow valve (83), and the safety overflow valve (83) is arranged on the bidirectional pump (1).

7. An emergency hydraulic pump station for a scotch yoke hydraulic steering gear according to claim 1 or 2, characterized in that: The emergency hydraulic pump station further comprises a one-way valve (84), and the oil outlet of the servo pump (2) is connected to the P port of the No. 2 three-position four-way valve (4) via the one-way valve (84).

8. An emergency hydraulic pump station for a scotch yoke hydraulic steering gear according to claim 1 or 2, characterized in that: The bidirectional pump (1) is a bidirectional quantitative pump.

9. A control method for an emergency hydraulic pump station for a scotch yoke hydraulic steering gear according to claim 1 or 2, characterized in that: The emergency hydraulic pump station further comprises a controller (85), wherein the controller (85) is connected to the second three-position four-way valve (4) by signal and is used to control the second three-position four-way valve (4) to switch to the left position or the right position for operation.

10. A control method for an emergency hydraulic pump station for a scotch yoke hydraulic steering gear according to claim 1 or 2, characterized in that: The piston rod of the double-rod oil cylinder (5) is connected to the swash plate of the bidirectional pump (1).

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