Straight walking module and excavator

Abstract

Embodiments of the present invention provide a linear walking module and an excavator, relating to the technical field of hydraulic control. The linear walking module includes a first pressure pump, a second pressure pump, a pilot pump, a linear walking spool valve, a left walking spool valve, a right walking spool valve, and a one-way regulating component. The linear walking spool valve includes a first inlet, a second inlet, a first outlet, and a second outlet; the first inlet is connected to the first pressure pump, the second inlet is connected to the second pressure pump, the first outlet is connected to the right walking spool valve, and the second outlet is used to be connected to a first working device. The one-way regulating component includes a third inlet and a third outlet, the third inlet is communicated with the second outlet, and the third outlet is communicated with the first inlet; the one-way regulating component can be used to regulate the flow rate distribution of the second outlet. The linear walking module can regulate the flow rate distribution of the second outlet, which can not only prevent the problem of linear walking deviation, but also meet the operation requirements under different working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic control, and more particularly, to a linear travel module and an excavator. Background Art

[0002] The working conditions of excavators are complex and the working environment is harsh. Hydraulic motors are often used to drive crawlers as their traveling working devices. In the prior art, an excavator is equipped with two pumps of the same displacement as the main power sources. The two pumps separately supply oil to the two traveling motors through the left and right traveling spool valves respectively to achieve left and right rotation. When the vehicle needs to travel straight, all the flow of one of the pumps passes through the linear travel spool valve for splitting, and then the flow is evenly divided to the left and right traveling motors through the left and right traveling spool valves. The two motors have the same speed and the left and right traveling speeds are the same, and at this time, the function of straight travel can be achieved.

[0003] Although this oil supply method can achieve the function of straight travel, due to the rapid switching of the linear travel spool valve, at the moment when all the flow of one of the pumps is split, the difference in flow will still cause uneven flow distribution into the traveling motors through the left and right traveling spool valves, resulting in the phenomenon of traveling deviation, and at the same time, there is also a large hydraulic shock. Summary of the Invention

[0004] The objectives of the present invention include, for example, providing a linear travel module and an excavator, which can achieve the adjustment and distribution of flow, not only can prevent the deviation problem during straight travel, but also can flexibly distribute the flow according to different working conditions to adapt to different working conditions, with higher flexibility.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] In a first aspect, an embodiment of the present invention provides a linear travel module, including a first pressure pump, a second pressure pump, a pilot pump, a linear travel spool valve, a left travel spool valve, a right travel spool valve, and a one-way adjustment assembly;

[0007] The linear travel spool valve includes a first inlet, a second inlet, a first outlet, and a second outlet; the first inlet is connected to the first pressure pump, the second inlet is connected to the second pressure pump, the first outlet is connected to the right travel spool valve, and the second outlet is used to be connected to a first working device;

[0008] The pilot pump is connected to the linear travel spool valve;

[0009] The one-way adjustment assembly includes a third inlet and a third outlet. The third inlet is communicated with the second outlet, and the third outlet is communicated with the first inlet; the one-way adjustment assembly can be used to adjust the flow distribution of the second outlet;

[0010] The first pressure pump is connected to the left travel spool, the left travel spool is used to connect to the left travel motor, and the right travel spool is used to connect to the right travel motor.

[0011] In an alternative embodiment, the first inlet is in communication with the first outlet, and the second inlet is in communication with the second outlet.

[0012] In an alternative embodiment, the one-way adjustment assembly includes a housing, a one-way valve, and an adjustment member. The housing is provided with the third inlet and the third outlet. The one-way valve is installed between the third inlet and the third outlet. The adjustment member is connected to the one-way valve and is used to adjust the flow rate from the third inlet to the third outlet.

[0013] In an alternative embodiment, the one-way valve includes a valve body, a valve core, and an elastic member. The valve core and the elastic member are installed in the valve body. The valve core is connected to the elastic member, and the adjustment member is connected to the valve core;

[0014] The adjustment member is used to adjust the compression amount of the elastic member to change the displacement amount of the valve core in the valve body.

[0015] In an alternative embodiment, a support is further provided in the valve body. One end of the elastic member is installed on the support, and the other end abuts against the valve core. The adjustment member is connected to the support.

[0016] In an alternative embodiment, the adjustment member is an adjustment screw. The support is connected to the adjustment screw and can move along the axial direction of the adjustment screw.

[0017] In an alternative embodiment, a connector is further included. The connector is fixedly connected to the support, and the adjustment screw is connected to the connector to drive the support to move along the axial direction of the adjustment screw.

[0018] In an alternative embodiment, a locking nut is provided on the adjustment screw.

[0019] In an alternative embodiment, the elastic member is a spring or a spring piece.

[0020] In a second aspect, an embodiment of the present invention provides an excavator, including the linear travel module according to any one of the foregoing embodiments. The linear travel module includes a first pressure pump, a second pressure pump, a pilot pump, a linear travel spool, a left travel spool, a right travel spool, and a one-way adjustment assembly;

[0021] The linear travel spool valve includes a first inlet, a second inlet, a first outlet, and a second outlet; the first inlet is connected to the first pressure pump, the second inlet is connected to the second pressure pump, the first outlet is connected to the right travel spool valve, and the second outlet is used to be connected to a first working device; the pilot pump is connected to the linear travel spool valve;

[0022] The one-way adjustment assembly includes a third inlet and a third outlet, the third inlet communicates with the second outlet, and the third outlet communicates with the first inlet; the one-way adjustment assembly can be used to adjust the flow distribution of the second outlet; the first pressure pump is connected to the left travel spool valve, the left travel spool valve is used to be connected to a left travel motor, and the right travel spool valve is used to be connected to a right travel motor.

[0023] The beneficial effects of the embodiments of the present invention include, for example:

[0024] The linear travel module provided by the embodiments of the present invention, by providing a one-way adjustment assembly at the second outlet of the linear travel spool valve, enables a part of the pressure oil provided by the second pressure pump to reach the first working device from the second outlet for the operation of the first working device; another part of the hydraulic oil passes through the one-way adjustment assembly to reach the first inlet of the linear travel spool valve, and after being mixed with the pressure oil provided by the first pressure pump, it is evenly distributed to the left travel spool valve and the right travel spool valve again. The setting of the one-way adjustment assembly improves the problem of uneven flow division caused by the instantaneous switching of the linear travel spool valve and prevents the deviation problem during linear travel. At the same time, since the one-way adjustment assembly has a flow regulation function, it can regulate and distribute the flow of the second outlet of the linear travel spool valve to adapt to different working conditions and improve the operation flexibility of the whole vehicle.

[0025] The excavator provided by the embodiments of the present invention includes the above-mentioned linear travel module, has the characteristic of preventing deviation during linear travel, and at the same time, the flow distribution can be selectively adjusted to adapt to different working conditions and improve the construction flexibility of the excavator. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic diagram of the hydraulic control principle of the linear travel module provided by the embodiments of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the one-way adjustment assembly of the linear travel module provided by the embodiments of the present invention.

[0029] Icons: 101 - First pressure pump; 102 - Second pressure pump; 103 - Pilot pump; 104 - Relief valve; 105 - First check valve; 106 - Second check valve; 110 - Straight travel spool; A - First inlet; B - First outlet; C - Second inlet; D - Second outlet; 120 - One-way adjustment assembly; 121 - Third inlet; 123 - Third outlet; 130 - Left travel spool; 140 - Right travel spool; 151 - First working spool; 152 - Second working spool; 201 - Housing; 210 - Check valve; 211 - Valve body; 212 - Spool; 213 - Elastic member; 214 - Support; 220 - Adjusting member; 221 - Locking nut; 223 - Connector; 231 - First retaining ring; 232 - First sealing ring; 233 - Second retaining ring; 234 - Second sealing ring. Detailed implementation mode

[0030] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0032] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0034] In addition, if terms such as "first", "second", etc. are used only for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0035] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0036] The working conditions of an excavator are complex and the working environment is harsh. It often adopts the method of driving the crawler by a hydraulic motor to move. That is, the excavator is equipped with two pumps with the same displacement as the main power source. The two pumps separately supply oil to the two traveling motors through the left and right traveling spool valves respectively to achieve left and right rotation. When the excavator needs to travel straight, all the flow of one of the pumps is shunted through the straight traveling spool valve, and then the flow is evenly divided to the left and right traveling motors through the left and right traveling spool valves. The two motors have the same speed and the left and right traveling speeds are the same, so that straight travel can be achieved. However, due to the rapid switching of the straight traveling spool valve, at the moment when all the flow of one of the pumps is shunted, the difference in flow will still cause uneven flow distribution into the traveling motors through the left and right traveling spool valves, resulting in the phenomenon of traveling deviation, and at the same time, there is also a large hydraulic shock.

[0037] In order to overcome the defects in the prior art, the present application proposes a straight travel module, which can effectively alleviate the phenomenon of straight travel deviation and impact, and can realize the adjustment of flow distribution to adapt to different working conditions and improve the operation flexibility of the whole vehicle.

[0038] Please refer to Figure 1 , this embodiment provides a straight travel module, including a first pressure pump 101, a second pressure pump 102, a pilot pump 103, a straight travel spool valve 110, a left travel spool valve 130, a right travel spool valve 140 and a one-way adjustment component 120. The straight travel spool valve 110 includes a first inlet A, a second inlet C, a first outlet B and a second outlet D. The first inlet A is communicated with the first outlet B, and the second inlet C is communicated with the second outlet D. The first inlet A is connected to the first pressure pump 101, the second inlet C is connected to the second pressure pump 102, the first outlet B is connected to the right travel spool valve 140, the second outlet D is used to be connected to a first working device (not shown in the figure), and the outlet of the second pressure pump 102 is also connected to a second working device (not shown in the figure) to provide pressure oil for the second working device. The first working device and the second working device are the upper vehicle working devices, including but not limited to lifting equipment. The first pressure pump 101 is connected to the left travel spool valve 130, and the left travel spool valve 130 is used to be connected to a left travel motor (not shown in the figure), and the right travel spool valve 140 is used to be connected to a right travel motor (not shown in the figure).

[0039] The one-way adjustment assembly 120 includes a third inlet 121 and a third outlet 123. The third inlet 121 is communicated with the second outlet D, the third outlet 123 is communicated with the first inlet A, and the third outlet 123 is communicated with the outlet of the first pressure pump 101. The one-way adjustment assembly 120 can be used to adjust the flow distribution of the second outlet D. That is, a part of the pressure oil at the second outlet D passing through the linear travel spool 110 will flow to the first working device; another part of the pressure oil will flow to the first inlet A of the linear travel spool 110 through the one-way adjustment assembly 120 and converge with the pressure oil at the outlet of the first pressure pump 101. A part of the converged pressure oil reaches the left travel spool 130 to drive the left travel motor to rotate; another part of the pressure oil flows through the linear travel spool 110 to the right travel spool 140 to drive the right travel motor to rotate. Among them, the one-way adjustment assembly 120 has the functions of flow distribution and adjustment, that is, the one-way adjustment assembly 120 can control the flow rate from the second outlet D to the first inlet A. When the flow rate to the first inlet A is small, the flow rates to the first working device and the second working device are relatively large, so that the first working device and the second working device obtain more sufficient power. For example, the lifting force of the hoisting equipment can be improved and the hoisting efficiency can be increased. When the flow rate from the second outlet D to the first inlet A is large, the flow rates to the first working device and the second working device are relatively small, so that the impact of the combined action can be improved and the comfort of the customer can be increased. Therefore, through the flow distribution control of the one-way adjustment assembly 120, it can flexibly adapt to the needs of various different working conditions and improve the flexibility of the excavator operation.

[0040] In the linear travel module provided in this embodiment, two branches are provided at the second outlet D of the linear travel spool 110, one of which is connected to the first working device, and the other branch is connected to the first inlet A of the linear travel spool 110 through the one-way adjustment assembly 120. Optionally, the linear travel spool 110 adopts a two-position four-way valve. Figure 1The linear travel spool valve 110 in it is in the normal position, i.e., the left position. When linear travel is required, including linear forward and linear reverse, since the pilot pump 103 is connected to the linear travel spool valve 110, the pilot pump 103 first acts on the linear travel spool valve 110 to supply oil to the linear travel spool valve 110, causing the linear travel spool valve 110 to quickly switch from the normal position to the working position, i.e., to work in the right position. At this time, the pressurized oil at the outlet of the second pressure pump 102 flows to the second working device respectively and flows from the second inlet C of the linear travel spool valve 110 to the second outlet D. A part of the pressurized oil at the second outlet D flows to the first working device, and another part of the pressurized oil flows through the one-way regulating assembly 120 to the pipeline between the first inlet A of the linear travel spool valve 110 and the first pressure pump 101, and converges with the pressurized oil of the first pressure pump 101. The converged pressurized oil is divided into two parts. One part directly supplies the left travel motor through the left travel spool valve 130, and the other part supplies the right travel motor through the first inlet A and the first outlet B of the linear travel spool valve 110 to the right travel spool valve 140. The left travel motor and the right travel motor have the same flow rate and the same rotational speed, enabling the excavator to travel linearly.

[0041] Optionally, the linear travel spool valve 110 adopts an electric control method. The electric control method can accurately control the linear travel spool valve 110 to be in the normal position or the working position, with convenient operation and sensitive switching. The left travel spool valve 130 and the right travel spool valve 140 can adopt either an electric control method or a hydraulic control method, and no specific limitation is made here.

[0042] Please refer to Figure 2 , further, the one-way regulating assembly 120 includes a housing 201, a one-way valve 210, and an adjusting member 220. The housing 201 is provided with a third inlet 121 and a third outlet 123. The one-way valve 210 is installed between the third inlet 121 and the third outlet 123. The adjusting member 220 is connected to the one-way valve 210 and is used to adjust the flow rate from the third inlet 121 to the third outlet 123. Optionally, the one-way valve 210 includes a valve body 211, a valve core 212, and an elastic member 213. The valve core 212 and the elastic member 213 are installed in the valve body 211. The valve core 212 is connected to the elastic member 213, and the adjusting member 220 is connected to the valve core 212. It is easy to understand that when the pressurized oil reaches the valve core 212, if the oil pressure of the pressurized oil is greater than the elastic force of the elastic member 213, the valve core 212 moves under the action of the oil pressure of the pressurized oil to overcome the elastic force of the elastic member 213, so that the valve core 212 opens; if the oil pressure of the pressurized oil is less than or equal to the elastic force of the elastic member 213, the valve core 212 is in the closed state under the action of the elastic force of the elastic member 213. The elastic member 213 can adopt elastic elements such as springs or elastic sheets, and no specific limitation is made here. In this embodiment, the elastic member 213 adopts a spring.

[0043] Specifically, a support 214 is further provided inside the valve body 211. The support 214 is located within the accommodation cavity. One end of the elastic member 213 is mounted on the support 214, and the other end abuts against the valve core 212. According to the actual situation, the spring can abut against the end face of the valve core 212, or the spring can be sleeved on the valve core 212 so that the spring abuts against the outer peripheral surface of the valve core 212. Alternatively, a holding groove (not marked in the figure) is provided inside the valve core 212, and the spring abuts against the groove wall of the internal holding groove of the valve core 212. Here, no specific limitation is made, as long as it satisfies that when the valve core 212 is opened, work is done against the spring, and when the pressure oil is small, the valve core 212 is in the closed state under the elastic force of the spring. It is easy to understand that the valve core 212 can push the spring to move under the action of the oil pressure of the pressure oil, and the deformation amount (compression amount) of the spring determines the opening degree of the valve core 212, thereby determining the flow rate from the third inlet 121 to the third outlet 123. In this embodiment, an adjusting member 220 is further provided. The adjusting member 220 is used to adjust the displacement amount of the valve core 212 in the valve body 211, that is, the opening degree of the valve core 212, so as to control the flow rate from the third inlet 121 to the third outlet 123 and achieve flow rate adjustment and distribution.

[0044] Optionally, the adjusting member 220 is connected to the support 214. The adjusting member 220 adopts an adjusting screw rod. The support 214 is connected to the adjusting screw rod and can move along the axial direction of the adjusting screw rod. The adjusting member 220 is used to adjust the position of the support 214 to adjust the position of the elastic member 213, thereby changing the position of the valve core 212 in the valve body 211, that is, the opening degree of the valve core 212. Further, the support 214 and the adjusting screw rod are connected through a connecting head 223. The connecting head 223 is fixedly connected to the support 214, including but not limited to threaded connection, snap connection, or welding. The adjusting screw rod is connected to the connecting head 223 to drive the support 214 to move along the axial direction of the adjusting screw rod. In this embodiment, the support 214 is provided with a first external thread, and one end of the connecting head 223 is provided with a first internal thread. The first internal thread and the first external thread are adapted to achieve the threaded fit between the connecting head 223 and the support 214. The other end of the support 214 is provided with a second internal thread, and the adjusting screw rod is provided with a second external thread. The second internal thread and the second external thread are adapted to achieve the threaded fit between the connecting head 223 and the adjusting screw rod. When the adjusting screw rod rotates clockwise, it can drive the connecting head 223, the support 214, and the spring to extend outwards, so as to increase the opening degree of the valve core 212 and increase the flow rate from the third inlet 121 to the third outlet 123. When the adjusting screw rod rotates counterclockwise, it can drive the connecting head 223, the support 214, and the spring to extend inwards, so as to reduce the opening degree of the valve core 212 and reduce the flow rate from the third inlet 121 to the third outlet 123. It should be understood that during the debugging process, the best throttling point can be found through the adjusting member 220, and the user can also adjust the opening degree of the valve core 212 according to actual needs to adapt to different working conditions.

[0045] Optionally, a locking nut 221 is provided on the adjusting screw. When the adjusting screw is adjusted to make the valve core 212 have an appropriate opening degree, tighten the locking nut 221 to prevent the adjusting screw from moving again. When it is necessary to adjust the opening degree of the valve core 212 again, the locking nut 221 needs to be loosened and then the adjusting screw is adjusted.

[0046] Further, a first annular groove (not marked in the figure) is provided on the support 214. A first retaining ring 231 and a first sealing ring 232 are provided in the first annular groove. The first retaining ring 231 and the first sealing ring 232 are respectively embedded in the first annular groove, and the first retaining ring 231 and the first sealing ring 232 are stacked, that is, the sum of the thickness of the first retaining ring 231 and the thickness of the first sealing ring 232 is adapted to the width of the first annular groove, and the first retaining ring 231 and the first sealing ring 232 are simultaneously clamped between the outer surface of the support 214 and the inner surface of the connector 223. The setting of the first retaining ring 231 and the first sealing ring 232 is beneficial to improving the sealing performance and structural reliability of the connection between the support 214 and the connector 223, so as to improve the sealing performance and reliability of the entire one-way valve 210. Similarly, a second retaining ring 233 and a second sealing ring 234 are provided between the connector 223 and the valve body 211. A second annular groove (not marked in the figure) is provided on the connector 223 or the valve body 211. The second retaining ring 233 and the second seal are embedded in the second annular groove to improve the sealing performance and reliability of the connection between the connector 223 and the valve body 211, thereby being beneficial to improving the sealing performance of the entire one-way valve 210.

[0047] The working principle of the linear walking module provided in this embodiment is as follows:

[0048] The linear walking module provided in this embodiment does not need to change the structure of the original linear walking valve core 110. Only a one-way adjustment component 120 needs to be connected to the external pipeline of the linear walking valve core 110. It is applicable to various existing excavator hydraulic pipelines, with low improvement cost, high flexibility, and strong adaptability. The one-way adjustment component 120 has a flow adjustable function and can realize the distribution and adjustment of the flow rate of the second outlet D of the linear walking valve core 110.

[0049] The third inlet 121 of the one-way adjustment component 120 is connected to the second outlet D of the linear walking valve core 110, that is, the pressure oil at the outlet of the second pressure pump 102 leads to the third inlet 121, and the third outlet 123 is communicated with the outlet of the first pressure pump 101. When the pilot pump 103 supplies pilot oil and the linear walking valve core 110 quickly switches instantaneously, the pressure oil at the third outlet 123 is lower than the pressure oil at the third inlet 121. The pressure oil at the third outlet 123 enters the valve core 212 of the one-way adjustment component 120, and the pressure oil at the third inlet 121 acts on the valve core 212 of the one-way adjustment component 120, pushing open the valve core 212, so that the pressure oil at the third inlet 121 flows to the third outlet 123 to supplement the flow rate for linear walking.

[0050] When the adjusting member 220 is rotated to increase the opening degree of the valve core 212 and the flow rate through the one-way adjusting assembly 120 increases, the pressure oil of the second pressure pump 102 can be replenished to the right traveling valve core 140 through the linear traveling valve core 110, so as to make up for the uneven distribution of the pressure oil of the first pressure pump 101 to the left traveling valve core 130 and the right traveling valve core 140 caused by the rapid switching of the linear traveling valve core 110. This can not only prevent the problem of deviation during straight driving, but also improve the impact of composite actions and enhance the comfort of customers during use. When the adjusting member 220 is rotated to decrease the opening degree of the valve core 212 and the flow rate through the one-way adjusting assembly 120 decreases, the pressure oil of the second pressure pump 102 can provide more sufficient pressure oil for the first working device and the second working device, so that the first working device and the second working device can obtain more sufficient power. For example, it can improve the lifting force of the lifting equipment and increase the lifting efficiency. By adjusting the adjusting member 220, the one-way adjusting assembly 120 can control the flow rate, so as to adapt to the operation requirements under different working conditions, and improve the operation comfort and working efficiency of the excavator.

[0051] The embodiment of the present invention further provides an excavator, which includes the linear traveling module as described in any one of the foregoing embodiments, and an upper vehicle device is configured in the traveling hydraulic oil circuit. Among them, the upper vehicle device includes a first working device and a second working device. Combining Figure 1 , a first working valve core 151 and a second working valve core 152 are added to the oil circuit. The oil inlet of the first working valve core 151 is communicated with the outlet of the first pressure pump 101, and the oil outlet of the first working valve core 151 is connected to the first working device, so that the pressure oil coming out of the first pressure pump 101 can reach the first working device through the first working valve core 151 to supply oil to the first working device. The oil inlet of the second working valve core 152 is communicated with the outlet of the second pressure pump 102, and the oil outlet of the second working valve core 152 is connected to the second working device, so that the pressure oil coming out of the second pressure pump 102 can reach the second working device through the second working valve core 152 to supply oil to the second working device.

[0052] The first working device and the second working device include, but are not limited to, a lifting device for lifting goods; or it can also be other working devices, which are not specifically limited here. Of course, this linear traveling module can be applied to other hydraulic machinery fields in addition to being used in excavators.

[0053] The straight travel module includes a first pressure pump 101, a second pressure pump 102, a pilot pump 103, a straight travel spool 110, a left travel spool 130, a right travel spool 140, and a one-way regulating assembly 120. The straight travel spool 110 includes a first inlet A, a second inlet C, a first outlet B, and a second outlet D; the first inlet A is connected to the first pressure pump 101, the second inlet C is connected to the second pressure pump 102, the first outlet B is connected to the right travel spool 140, and the second outlet D is used to connect to a first working device; the pilot pump 103 is connected to the straight travel spool 110. The one-way regulating assembly 120 includes a third inlet 121 and a third outlet 123, the third inlet 121 communicates with the second outlet D, and the third outlet 123 communicates with the first inlet A; the one-way regulating assembly 120 can be used to adjust the flow distribution of the second outlet D; the first pressure pump 101 is connected to the left travel spool 130, the left travel spool 130 is used to connect to a left travel motor, and the right travel spool 140 is used to connect to a right travel motor.

[0054] When the straight travel spool 110 is in the normal position, the first pressure pump 101 can supply pressure oil to the left travel spool 130 to drive the left travel motor to turn left; it can also supply pressure oil to the first working device to drive the first working device to work. Of course, when performing the two actions of turning left and the first working device working, the pressure oil of the first pressure pump 101 can also supply oil to the left travel spool 130 and the first working device respectively at the same time. Similarly, the second pressure pump 102 can supply pressure oil to the right travel spool 140 to drive the right travel motor to turn right; it can also supply pressure oil to the second working device to drive the second working device to work. Of course, when performing the two actions of turning right and the second working device working, the pressure oil of the second pressure pump 102 can also supply oil to the right travel spool 140 and the second working device respectively at the same time.

[0055] It should be understood that when the left travel spool valve 130 and the right travel spool valve 140 act in opposite directions to each other, the first pressure pump 101 supplies oil to the left travel motor separately through the left travel spool valve 130, and the second pressure pump 102 supplies oil to the right travel motor separately through the right travel spool valve 140, so as to realize the left rotation and right rotation of the excavator. When the left travel spool valve 130 and the right travel spool valve 140 act in the same direction to each other, the first pressure pump 101 supplies oil to the left travel motor separately through the left travel spool valve 130, and the second pressure pump 102 supplies oil to the right travel motor separately through the right travel spool valve 140, so as to realize the left rotation and right rotation of the excavator in place. When the straight travel spool valve 110 is in the working position, most of the pressure oil provided by the second pressure pump 102 flows to the second working device and reaches the first working device through the second outlet D of the straight travel spool valve 110. The remaining small amount of pressure oil passes through the second outlet D, passes through the one-way regulating component 120 and converges with the pressure oil of the first pressure pump 101. The converged pressure oil is divided into two parts. One part passes through the left travel spool valve 130 and is used to drive the left travel motor; the other part reaches the right travel spool valve 140 through the first inlet A and the first outlet B of the straight travel spool valve 110 and is used to drive the right travel motor. The left travel motor and the right travel motor have the same flow rate and the same rotational speed, realizing straight travel.

[0056] In addition, the outlets of the first pressure pump 101 and the second pressure pump 102 are respectively connected with an overflow valve 104. A first one-way valve 105 is provided between the first pressure pump 101 and the overflow valve 104, and a second one-way valve 106 is provided between the second pressure pump 102 and the overflow valve 104. When the oil pressure of the first pressure pump 101 or the second pressure pump 102 is too high, the pressure oil can overflow and relieve pressure through the first one-way valve 105 or the second one-way valve 106 via the overflow valve 104, improving the safety and stability of the entire hydraulic oil circuit.

[0057] In summary, the embodiments of the present invention provide a straight travel module and an excavator, which have the following beneficial effects:

[0058] A linear travel module provided by an embodiment of the present invention connects a one-way adjustment assembly 120 to the second outlet D of a linear travel spool valve 110. The one-way adjustment assembly 120 can adjust and distribute the flow rate of the second outlet D. When the opening of the spool 212 in the one-way adjustment assembly 120 becomes larger, the flow rate passing through the one-way adjustment assembly 120 from the second outlet D increases. This part of the pressure oil converges with the pressure oil at the outlet of the first pressure pump 101 after passing through the one-way adjustment assembly 120, and then is evenly distributed to the left travel spool valve 130 and the right travel spool valve 140 to achieve linear travel. In this way, by setting the one-way adjustment assembly 120, not only can the deviation problem during linear travel be prevented, but also the impact of combined actions can be improved, enhancing the comfort of customers during use. When the opening of the spool 212 in the one-way adjustment assembly 120 becomes smaller, the flow rate passing through the one-way adjustment assembly 120 can be reduced, so that more pressure oil flows to the first working device and the second working device, providing more sufficient power for the first working device and the second working device and improving the working efficiency of the first working device and the second working device. This flow rate adjustment can be adjusted in a timely manner according to actual needs, which is beneficial to reducing the debugging work intensity and the design work intensity. This linear travel module can achieve the distribution and adjustment of flow rate to adapt to different working conditions. Users can manually adjust it according to actual needs. The operation is simple and convenient, with good reliability, high flexibility, and relatively small modifications to the original hydraulic circuit, low improvement costs, good universality, and strong compatibility for the hydraulic circuits of various types of models.

[0059] An excavator provided by an embodiment of the present invention includes the above-mentioned linear travel module, which can prevent the deviation problem during the linear travel of the excavator, alleviate hydraulic shock. At the same time, it can achieve the distribution and adjustment of flow rate to adapt to different working conditions, with good reliability, high flexibility, good universality, and low improvement costs.

[0060] As mentioned above, the above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A linear walking module, characterized in that, It includes a first pressure pump (101), a second pressure pump (102), a pilot pump (103), a straight travel spool (110), a left travel spool (130), a right travel spool (140) and a one-way adjustment assembly (120); The straight travel spool (110) includes a first inlet (A), a second inlet (C), a first outlet (B) and a second outlet (D); the first inlet (A) is connected to the first pressure pump (101), the second inlet (C) is connected to the second pressure pump (102), the first outlet (B) is connected to the right travel spool (140), and the second outlet (D) is used to connect to a first working device; The pilot pump (103) is connected to the straight travel spool (110); The one-way adjustment assembly (120) includes a third inlet (121) and a third outlet (123), the third inlet (121) is communicated with the second outlet (D), and the third outlet (123) is communicated with the first inlet (A); the one-way adjustment assembly (120) can be used to adjust the flow distribution of the second outlet (D); The first pressure pump (101) is connected to the left travel spool (130), the left travel spool (130) is used to connect to a left travel motor, and the right travel spool (140) is used to connect to a right travel motor; The first inlet (A) is communicated with the first outlet (B), and the second inlet (C) is communicated with the second outlet (D); The one-way adjustment assembly (120) includes a housing (201), a one-way valve (210) and an adjusting member (220). The housing (201) is provided with the third inlet (121) and the third outlet (123). The one-way valve (210) is installed between the third inlet (121) and the third outlet (123). The adjusting member (220) is connected to the one-way valve (210) and is used to adjust the flow rate from the third inlet (121) to the third outlet (123).

2. The linear walking module according to claim 1, wherein The one-way valve (210) includes a valve body (211), a valve core (212) and an elastic member (213). The valve core (212) and the elastic member (213) are installed in the valve body (211). The valve core (212) is connected to the elastic member (213), and the adjusting member (220) is connected to the valve core (212); the adjusting member (220) is used to adjust the compression amount of the elastic member (213) to change the displacement amount of the valve core (212) in the valve body (211).

3. The linear travel module according to claim 2, wherein A support (214) is further provided in the valve body (211). One end of the elastic member (213) is installed on the support (214), and the other end abuts against the valve core (212). The adjusting member (220) is connected to the support (214).

4. The linear walking module according to claim 3, wherein The adjusting member (220) adopts an adjusting screw. The support (214) is connected to the adjusting screw and can move along the axial direction of the adjusting screw.

5. The linear walking module according to claim 4, wherein, It further includes a connector (223), the connector (223) is fixedly connected to the support (214), and the adjusting screw is connected to the connector (223) to drive the support (214) to move along the axial direction of the adjusting screw.

6. The linear walking module according to claim 4, characterized in that, A locking nut (221) is provided on the adjusting screw.

7. The linear walking module according to any one of claims 2 to 6, characterized in that, The elastic member (213) is a spring or a spring piece.

8. An excavator, characterized in that, It includes a linear walking module according to any one of claims 1 to 7.

Images