Excavator swing motor and excavator swing hydraulic system

Abstract

The present invention discloses an excavator slewing motor and an excavator slewing hydraulic system, which belong to the technical field of engineering machinery. It solves the defects of the conventional slewing motor in the prior art, such as the complex connection and hydraulic oil leakage, due to the large number of external oil ports and pipelines. Its main structure includes a slewing motor, and the slewing motor includes a brake valve, a brake cylinder, a motor, a slewing device and a brake device. The motor is connected to the slewing device, and the brake device is respectively connected to the C2 port and the signal a port of the brake valve, the A2 port of the brake valve is connected to the brake cylinder, and the B2 port is connected to the Dr port. The present invention is mainly used in engineering machinery such as excavators.

Description

Technical field:

[0001] The present invention belongs to the technical field of engineering machinery, and in particular, relates to an excavator rotary motor and an excavator rotary hydraulic system. Background technology:

[0002] In the prior art, there are two types of excavators that use a slewing motor to achieve the entire machine rotation. The first type is Figure 5 As shown,

[0003] 1. Rotation realization process: The operator operates the rotation pilot handle, connects the pilot oil circuit to push the main valve rotation spool, so that the hydraulic oil of the main pump enters the motor B port through the valve core hole, and the hydraulic oil returns from the A port through the main valve rotation spool, completing the whole process of rotary oil supply.

[0004] 2. Slewing braking process: The operator operates the swing pilot handle to close the main valve swing coupling spool. The main pump oil cannot enter the motor, and the oil supply and return of the motor's A and B ports stop. At this time, the whole machine will drag the motor to continue to rotate due to inertia. At this time, in order to prevent the motor from sucking air, it is necessary to replenish oil to the motor's M port. The existing solution is that the motor M port is connected to the main valve T port, and the swing motor is replenished with oil through the return oil of the main valve. Therefore, the swing motor is provided with a special M oil port for oil replenishment; when the pressure generated by the rotation inertia of the whole machine is higher than the set pressure of the relief valve, the relief valve overflows, and the overflowing hydraulic oil enters the motor oil replenishment port for partial oil replenishment.

[0005] 3. Swing motor brake: A friction plate is installed inside the swing motor to brake the motor when it stops using and prevent the motor from rotating. The motor can rotate normally only after pilot oil is introduced into the motor through the external PG port oil circuit to release the brake. That is, when no pilot oil enters, the friction plate is pressed tightly by the spring force and the motor brake prevents the motor from rotating. When pilot oil enters, the spring force is overcome and the motor brake is released.

[0006] The second type Figure 6 As shown, the main difference between the second type and the first type is the release of the swing motor brake.

[0007] Swing motor brake release: A friction plate is installed inside the swing motor for braking when the motor stops using to prevent the motor from rotating. The motor introduces pilot oil through the external PG port oil circuit to release the brake, but it is necessary to first add a shuttle valve to filter out high-pressure oil from the swing pilot handle and enter the SH oil port of the swing motor to push the valve core, so that the pilot oil from the PG oil port enters the piston chamber of the swing motor brake to release the brake and the motor can rotate normally; that is, when no pilot oil enters, the friction plate is pressed by the spring force, and the motor brake prevents the motor from rotating. When pilot oil enters, the spring force is overcome and the motor brake is released.

[0008] However, regardless of the first or second solution, the swing motor must be provided with an oil replenishment port M and an external pressure oil port and pipeline for releasing the swing motor brake, resulting in the swing motor having many external oil ports and pipelines, complex connections, hydraulic oil leakage and other problems. Summary of the invention:

[0009] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an excavator slewing motor and an excavator slewing hydraulic system, wherein the slewing motor realizes automatic brake release of the internal oil circuit, and the slewing motor replenishes oil through the Y-type function of the main valve slewing connecting valve core, thereby eliminating the motor oil replenishing port and the PG / SH oil port, thereby realizing internal self-locking and oil replenishing of the motor.

[0010] In order to achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0011] An excavator slewing motor includes a slewing motor, which includes a brake valve, a brake cylinder, a motor, a slewing device and a brake device. The motor is connected to the slewing device, and the brake device is respectively connected to the C2 port and the signal a port of the brake valve, the A2 port of the brake valve is connected to the brake cylinder, and the B2 port is connected to the Dr port.

[0012] Preferably, the rotary motor further comprises an overflow valve A and an overflow valve B, and the oil ports on both sides of the motor are connected to the overflow valve A and the overflow valve B respectively.

[0013] Preferably, the braking device comprises a balancing valve A, and the balancing valve A is respectively connected to the C2 port of the braking valve, the signal a port and the motor.

[0014] Preferably, the rotary device includes a one-way valve A and a one-way valve B, the signal oil ports on both sides of the balancing valve A are respectively connected to the oil inlet of the one-way valve A and the oil inlet of the one-way valve B, the oil outlet of the one-way valve A is connected to the B1 side of the motor, and the oil outlet of the one-way valve B is connected to the A1 side of the motor.

[0015] Preferably, the braking device comprises a one-way valve C and a one-way valve D, and the oil outlet of the one-way valve C and the oil outlet of the one-way valve D are respectively connected to the C2 port and the signal a port of the brake valve.

[0016] Preferably, the rotary device includes a one-way valve A, a one-way valve B and a balancing valve B, the oil outlet of the one-way valve A is respectively connected to the oil inlet of the one-way valve D and the B1 side of the motor, the oil outlet of the one-way valve B is respectively connected to the oil inlet of the one-way valve C and the A1 side of the motor, and the balancing valve B is connected to the motor.

[0017] Preferably, the rotary device includes a hydraulically controlled one-way valve A and a hydraulically controlled one-way valve B, wherein the hydraulically controlled one-way valve A is respectively connected to the B1 side of the motor and the oil inlet of the one-way valve D, and the hydraulically controlled one-way valve B is respectively connected to the A1 side of the motor and the oil inlet of the one-way valve C.

[0018] An excavator rotary hydraulic system comprises a rotary pilot handle, a main valve rotary coupling, a main pump and a hydraulic oil tank. The excavator rotary hydraulic system also comprises a rotary motor as described in any one of the above items. The main valve rotary coupling is connected to the A port, B port, main pump and hydraulic oil tank of the rotary motor. The rotary pilot handle is connected to the pilot oil ports on both sides of the main valve rotary coupling.

[0019] Preferably, the middle position of the main valve rotary coupling is a Y-type function.

[0020] Preferably, the excavator swing hydraulic system further comprises a pilot oil source valve, and the pilot oil source valve is connected to the oil outlet of the main pump.

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

[0022] 1. In the present invention, by adding a balancing valve A, a balancing valve B, a brake valve and a Y-type valve core to the main valve rotary joint valve core, the A / B oil ports of the rotary motor are both connected to the return oil T when the main valve core is in the middle position, thereby realizing the internal self-locking, release and oil replenishment of the rotary motor, and achieving the purpose of removing the rotary motor oil replenishment port and brake release port;

[0023] 2. Make multiple adjustments to the existing internal parts of the excavator's swing motor and the main valve swing spool, remove the existing external oil replenishment port and brake release oil port of the swing motor, and solve the problems of multiple external oil ports, multiple pipelines, complex connections, and hydraulic oil leakage of the swing motor. Description of the drawings:

[0024] Figure 1 It is a schematic diagram of Example 2 of the present invention;

[0025] Figure 2 This is a schematic diagram of Example 3 of the present invention;

[0026] Figure 3 This is a schematic diagram of Example 4 of the present invention;

[0027] Figure 4 This is a hydraulic principle diagram of Example 5 of the present invention;

[0028] Figure 5 The hydraulic principle of the existing excavator rotary hydraulic system Figure 1 ;

[0029] Figure 6 The hydraulic principle of the existing excavator rotary hydraulic system Figure 2.

[0030] In the figure: 1. rotary motor; 2. rotary pilot handle; 3. main valve rotary joint; 4. main pump; 5. pilot oil source valve; 6. hydraulic oil tank; 101. balance valve A; 102. check valve A; 103. check valve B; 104. overflow valve A; 105. overflow valve B; 106. brake valve; 107. brake cylinder; 108. reducer; 109. balance valve B; 110. check valve C; 111. check valve D; 112. hydraulically controlled check valve A; 113. hydraulically controlled check valve B; 114. motor; 115. throttle port; 116. throttle hole. Specific implementation method:

[0031] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0032] Embodiment 1:

[0033] An excavator slewing motor includes a slewing motor 1, wherein the slewing motor 1 includes a brake valve 106, a brake oil cylinder 107, a motor 114, a slewing device and a brake device. The motor 114 is connected to the slewing device, and the brake device is respectively connected to the C2 port and the signal a port of the brake valve 106. The A2 port of the brake valve 106 is connected to the brake oil cylinder 107, and the B2 port is connected to the Dr port. The spring chamber of the brake oil cylinder 107 is connected to the Dr port, and the Dr port is connected back to the hydraulic oil tank 6. The motor 114 is connected to the reducer 108, and the reducer 108 decelerates the motor 114 and outputs it.

[0034] The rotary motor 1 further includes a relief valve A104 and a relief valve B105. The oil ports on both sides of the motor 114 are connected to the relief valve A104 and the relief valve B105 respectively. The relief valve A104 and the relief valve B105 are connected in parallel. The relief valve A104 and the relief valve B105 connect the A1 / B1 chambers. When the pressure of the A1 chamber is higher than the set pressure of the relief valve B105, the hydraulic oil overflows to the B1 chamber; when the pressure of the B1 chamber is higher than the set pressure of the relief valve A104, the hydraulic oil overflows to the A1 chamber. The relief pressure settings of the relief valve A104 and the relief valve B105 are consistent.

[0035] Embodiment 2:

[0036] like Figure 1 As shown, an excavator slewing motor, the braking device includes a balance valve A101, and the balance valve A101 is respectively connected to the C2 port of the brake valve 106, the signal a port, the motor 114, the external oil source A port and the external oil source B port.

[0037] The balancing valve A101 is a three-position five-way structure. Springs are arranged on both sides of the valve core for returning the valve core. Throttle holes 116 are arranged on both sides of the valve core of the balancing valve A101. The throttle holes 116 can make the valve core move smoothly and stably to reduce impact.

[0038] The rotary device includes a one-way valve A102 and a one-way valve B103, the signal oil ports on both sides of the balance valve A101 are respectively connected to the oil inlet of the one-way valve A102 and the oil inlet of the one-way valve B103, the oil outlet of the one-way valve A102 is connected to the B1 side of the motor 114, and the oil outlet of the one-way valve B103 is connected to the A1 side of the motor 114. The other parts are the same as those in Example 1.

[0039] Embodiment 3:

[0040] like Figure 2 As shown, an excavator slewing motor, the brake device includes a one-way valve C110 and a one-way valve D111, the oil outlet of the one-way valve C110 and the oil outlet of the one-way valve D111 are respectively connected to the C2 port and the signal a port of the brake valve 106. The one-way valve C110 and the one-way valve D111 take the pressure signal from the main oil circuit to act on the brake valve 106.

[0041] The rotary device includes a one-way valve A102, a one-way valve B103 and a balance valve B109, the oil outlet of the one-way valve A102 is respectively connected to the oil inlet of the one-way valve D111 and the B1 side of the motor 114, the oil outlet of the one-way valve B103 is respectively connected to the oil inlet of the one-way valve C110 and the A1 side of the motor 114, and the balance valve B109 is connected to the B1 side, the A1 side, the external oil source A port and the external oil source B port of the motor 114. The other parts are the same as those in Example 1.

[0042] The one-way valve A102 and the one-way valve B103 are arranged in the main oil circuit of the A / B port of the swing motor 1 to prevent the hydraulic oil of the swing motor 1 from flowing in reverse. The balance valve B109 is a three-position four-way structure, and springs are arranged on both sides of the valve core for the valve core to return to its position; the throttle holes 116 are arranged on both sides of the valve core to enable the valve core to move smoothly and stably to reduce impact.

[0043] Embodiment 4:

[0044] like Figure 3 As shown, an excavator slewing motor, the braking device includes a one-way valve C110 and a one-way valve D111, the oil outlet of the one-way valve C110 and the oil outlet of the one-way valve D111 are respectively connected to the C2 port and the signal a port of the brake valve 106.

[0045] The rotary device includes a hydraulically controlled one-way valve A112 and a hydraulically controlled one-way valve B113, wherein the hydraulically controlled one-way valve A112 is respectively connected to the B1 side of the motor 114, the oil inlet of the one-way valve D111, the external oil source A port and the external oil source B port, and the hydraulically controlled one-way valve B113 is respectively connected to the A1 side of the motor 114, the oil inlet of the one-way valve C110, the external oil source A port and the external oil source B port. The other parts are the same as those in Example 1.

[0046] When the oil inlet pressure at port B is high, the one-way valve in the hydraulically controlled one-way valve B113 at port A can be pushed to open and return oil. When the oil inlet pressure at port A is high, the one-way valve in the hydraulically controlled one-way valve A112 at port B can be pushed to open and return oil. In addition, a throttle port 115 is provided between port A and the hydraulically controlled one-way valve A112, and between port B and the hydraulically controlled one-way valve B113. Increasing throttling in the control oil circuit can make the valve core move smoothly and stably, reducing impact.

[0047] Embodiment 5:

[0048] like Figure 4 As shown, an excavator rotary hydraulic system includes a rotary pilot handle 2, a main valve rotary link 3, a main pump 4, a pilot oil source valve 5 and a hydraulic oil tank 6, and also includes a rotary motor 1 as described in any one of Examples 1-4, the main valve rotary link 3 is connected to the A port, B port, main pump 4 and hydraulic oil tank 6 of the rotary motor 1, the rotary pilot handle 2 is connected to the pilot oil ports on both sides of the main valve rotary link 3, and the pilot oil source valve 5 is connected to the oil outlet of the main pump 4.

[0049] The middle position of the main valve rotary link 3 is a Y-type function. When in the middle position, the A / B oil ports of the rotary motor 1 are connected to the return oil T for oil replenishment.

[0050] The specific implementation process of the present invention is described by taking Example 2 as an example:

[0051] 1. Rotation realization process: The operator operates the rotation pilot handle 2, connects the pilot oil circuit to push the valve core of the main valve rotation link 3, so that the hydraulic oil of the main pump 4 enters the B port of the rotary motor 1 through the valve core hole, and the hydraulic oil of the B port enters the motor 114 through the one-way valve A102. The high-pressure oil of the B port acts on the left side of the valve core of the balance valve A101 at the same time, and the valve core moves to the right. The valve core of the balance valve A101 is in the left position. At this time, the hydraulic oil entering from the B port returns through the motor 114, and the hydraulic oil passes through the valve core of the balance valve A101 and then through the A port into the valve core of the main valve rotary link 3 to return oil, completing the whole process of rotary oil supply.

[0052] 2. Slewing braking process: The operator operates the swing pilot handle 2 to close the valve core of the main valve swing link 3. The oil of the main pump 4 cannot enter the motor 114, and the oil supply and return of the A and B ports of the swing motor 1 stop. At this time, the whole machine will drag the motor 114 to continue to rotate due to inertia. At this time, in order to prevent the motor 114 from being sucked into the air, it is necessary to replenish oil to the A1 / B1 port of the motor 114. At this time, the valve core of the main valve swing link 3 is in the middle position, and the valve core uses a Y-type valve core. The A / B oil ports of the swing motor 1 are connected to the hydraulic oil tank 6 to achieve the purpose of oil replenishment; when the pressure generated by the rotation inertia of the whole machine is higher than the set pressure of the relief valve A104 / relief valve B105, the relief valve A104 / relief valve B105 overflows, and the overflowing hydraulic oil enters the oil circuit on the opposite side of the motor 114 for partial oil replenishment.

[0053] 3. Braking and releasing of the swing motor: A friction plate is installed inside the swing motor 1 for braking the motor 114 when it stops being used to prevent the motor 114 from rotating. The motor brake releasing process is as follows: the operator operates the swing pilot handle 2, connects the pilot oil circuit to push the valve core of the main valve swing link 3, and allows the hydraulic oil of the main pump 4 to enter the B port of the swing motor 1 through the valve core of the main valve swing link 3. At this time, the valve core of the balance valve A101 moves to the right, so that the valve core of the balance valve A101 is located on the left, and the middle oil circuit is connected to allow the high-pressure oil to pass through the valve core to reach the valve core of the brake valve 106. The pressure oil enters the a port on the right side of the brake valve 106 to push the brake valve 1 06 valve core moves to the left, so that the high-pressure oil in front of the valve core of the brake valve 106 enters the brake cylinder 107, overcoming the spring force to release the brake of the swing motor 1; when the operator operates the swing pilot handle 2 and closes the valve core of the main valve swing link 3, the oil of the main pump 4 cannot enter the swing motor 1, and there is no high-pressure oil at the A and B ports of the swing motor 1. At this time, the balance valve A101 returns to the middle position, and there is no high-pressure oil on the a side of the brake valve 106. The valve core is moved to the left position by the left spring force, and the pressure oil in the brake cylinder 107 flows to the Dr port through the throttle hole inside the valve core of the brake valve 106. After a delay of 5-6s through the throttle hole, the swing motor 1 achieves self-locking braking.

Claims

1. An excavator swing motor, comprising a swing motor (1), characterized in that: The rotary motor (1) comprises a brake valve (106), a brake oil cylinder (107), a motor (114), a rotary device and a brake device, wherein the motor (114) is connected to the rotary device, the brake device is respectively connected to the C2 port and the signal a port of the brake valve (106), the A2 port of the brake valve (106) is connected to the brake oil cylinder (107), and the B2 port is connected to the Dr port; The rotary motor (1) further comprises a relief valve A (104) and a relief valve B (105), and the oil ports on both sides of the motor (114) are respectively connected to the relief valve A (104) and the relief valve B (105); The brake device comprises a balance valve A (101), wherein the balance valve A (101) is respectively connected to a C2 port of a brake valve (106), a signal a port and a motor (114); The rotary device comprises a one-way valve A (102) and a one-way valve B (103); the signal oil ports on both sides of the balance valve A (101) are respectively connected to the oil inlet of the one-way valve A (102) and the oil inlet of the one-way valve B (103); the oil outlet of the one-way valve A (102) is connected to the B1 side of the motor (114); and the oil outlet of the one-way valve B (103) is connected to the A1 side of the motor (114).

2. An excavator swing motor, comprising a swing motor (1), characterized in that: The rotary motor (1) comprises a brake valve (106), a brake oil cylinder (107), a motor (114), a rotary device and a brake device, wherein the motor (114) is connected to the rotary device, the brake device is respectively connected to the C2 port and the signal a port of the brake valve (106), the A2 port of the brake valve (106) is connected to the brake oil cylinder (107), and the B2 port is connected to the Dr port; The rotary motor (1) further comprises a relief valve A (104) and a relief valve B (105), and the oil ports on both sides of the motor (114) are respectively connected to the relief valve A (104) and the relief valve B (105); The brake device comprises a one-way valve C (110) and a one-way valve D (111), wherein an oil outlet of the one-way valve C (110) and an oil outlet of the one-way valve D (111) are respectively connected to a C2 port and a signal a port of a brake valve (106); The rotary device comprises a one-way valve A (102), a one-way valve B (103) and a balancing valve B (109); an oil outlet of the one-way valve A (102) is respectively connected to an oil inlet of a one-way valve D (111) and a B1 side of a motor (114); an oil outlet of the one-way valve B (103) is respectively connected to an oil inlet of a one-way valve C (110) and an A1 side of a motor (114); and the balancing valve B (109) is connected to the motor (114).

3. An excavator swing motor, comprising a swing motor (1), characterized in that: The rotary motor (1) comprises a brake valve (106), a brake oil cylinder (107), a motor (114), a rotary device and a brake device, wherein the motor (114) is connected to the rotary device, the brake device is respectively connected to the C2 port and the signal a port of the brake valve (106), the A2 port of the brake valve (106) is connected to the brake oil cylinder (107), and the B2 port is connected to the Dr port; The rotary motor (1) further comprises a relief valve A (104) and a relief valve B (105), and the oil ports on both sides of the motor (114) are respectively connected to the relief valve A (104) and the relief valve B (105); The brake device comprises a one-way valve C (110) and a one-way valve D (111), wherein an oil outlet of the one-way valve C (110) and an oil outlet of the one-way valve D (111) are respectively connected to a C2 port and a signal a port of a brake valve (106); The rotary device comprises a hydraulically controlled one-way valve A (112) and a hydraulically controlled one-way valve B (113), wherein the hydraulically controlled one-way valve A (112) is respectively connected to the B1 side of the motor (114) and the oil inlet of the one-way valve D (111), and the hydraulically controlled one-way valve B (113) is respectively connected to the A1 side of the motor (114) and the oil inlet of the one-way valve C (110).

4. An excavator rotary hydraulic system, comprising a rotary pilot handle (2), a main valve rotary link (3), a main pump (4) and a hydraulic oil tank (6), characterized in that: The excavator swing hydraulic system also includes a swing motor (1) as described in any one of claims 1 to 3, the main valve swing link (3) is connected to the A port, B port, main pump (4) and hydraulic oil tank (6) of the swing motor (1), and the swing pilot handle (2) is connected to the pilot oil ports on both sides of the main valve swing link (3).

5. The excavator rotary hydraulic system according to claim 4, characterized in that: The middle position of the main valve rotary joint (3) is a Y-type function.

6. The excavator rotary hydraulic system according to claim 5, characterized in that: The excavator rotary hydraulic system further comprises a pilot oil source valve (5), and the pilot oil source valve (5) is connected to the oil outlet of the main pump (4).

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