CN220979976U - Hydraulic control hydraulic lock for multi-way reversing valve of tractor and multi-way reversing valve - Google Patents

Abstract

The utility model discloses a hydraulic control hydraulic lock of a multi-way reversing valve of a tractor and the multi-way reversing valve, and relates to the field of multi-way reversing valves. The multi-way reversing valve is internally provided with a movable arm oil cylinder oil way and a hydraulic control hydraulic lock, and a first cavity for accommodating the hydraulic control hydraulic lock is arranged in the multi-way reversing valve; the hydraulic control hydraulic lock comprises a spring seat, a spring and a one-way valve which are sequentially connected, wherein a first small hole and a first circulation channel are arranged on the one-way valve, the first small hole is respectively communicated with the oil inlet channel and the first circulation channel, and the first circulation channel is communicated with the first cavity; a sliding groove is arranged in the multi-way reversing valve, the first cavity is communicated with the oil return channel through a second circulation channel and the sliding groove, and a second small hole is formed at the tail end of the second circulation channel; the sliding groove is internally provided with a valve rod which is used for plugging or releasing the second small hole and controlling the connection or disconnection of the first cavity and the oil return channel. The hydraulic unloading control device disclosed by the utility model is used for hydraulic unloading control by applying the throttling pressure difference principle, and has the advantages of small operating force, no abrasion and long service life.

Description

Hydraulic control hydraulic lock for multi-way reversing valve of tractor and multi-way reversing valve

Technical Field

The utility model belongs to the technical field of control of multiple directional control valves, and particularly relates to a hydraulic control hydraulic lock of a tractor multiple directional control valve and the multiple directional control valve.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The multi-way reversing valve is often used on machinery such as a tractor, the auxiliary tool is lifted to a preset position through the oil way reversing of the multi-way reversing valve and kept for a set time, and the auxiliary tool is required to be ensured not to be settled in the time. However, the gap exists between the valve hole of the reversing valve of the multi-way valve and the valve rod, so that the auxiliary tool cannot be settled, a hydraulic lock device is needed, the pressure oil of the oil cylinder cannot be leaked, the auxiliary tool cannot be settled in the vehicle transferring process, and the safety of the vehicle in the driving process is ensured.

The hydraulic lock of the existing tractor hydraulic working multi-way valve is mainly a mechanical mechanism device, and comprises a valve sleeve (1), a hole circlip (2), an upper spring seat (3), a spring (4), a cone valve (5), a lower spring seat (6), a first steel ball (7), a push rod (8), a second steel ball (9) and a valve rod (10) as shown in figures 1 and 2. When the valve rod (10) is pushed in, hydraulic oil opens the cone valve (5) to enter the large oil cylinder cavity (12) from the port A (14), after the weight is pushed to a preset position, the valve rod (10) returns to the middle position, and the weight is kept at the preset position.

When the valve rod (10) is pulled out, the second steel ball (9) slides to the valve rod shoulder (15), the second steel ball (9) is lifted to jack the first steel ball (7) through the ejector rod (8), the high-pressure oil in the large arm reversely opens the cone valve (5), and flows to the oil return duct (13) through the opening of the valve core movement to enter the small oil cylinder cavity (11), so that the large arm descends.

The inventor finds that the mechanical unloading structure of the hydraulic lock for the multi-way valve of the tractor has hard contact friction of parts in the operation process, and is easy to cause failure modes such as abrasion, clamping stagnation and the like, so that the hydraulic lock has a plurality of faults and short service life.

Disclosure of utility model

The utility model aims to provide a hydraulic control hydraulic lock of a multi-way reversing valve of a tractor and the multi-way reversing valve, which are used for hydraulic unloading control by using a throttling pressure difference principle, realize the function of the hydraulic lock, have small operating force, no abrasion and long service life and solve the problems in the prior art.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

The first aspect of the utility model provides a hydraulic control hydraulic lock for a multi-way reversing valve of a tractor.

The hydraulic control hydraulic lock comprises a multi-way reversing valve and a movable arm oil cylinder for controlling a movable arm to lift or descend, wherein a movable arm oil cylinder oil way and a hydraulic control hydraulic lock for controlling the on and off of the movable arm oil cylinder oil way are arranged in the multi-way reversing valve, the movable arm oil cylinder oil way comprises an oil inlet passage and an oil return passage, and a first cavity for accommodating the hydraulic control hydraulic lock is arranged in the multi-way reversing valve; the hydraulic control hydraulic lock comprises a spring seat, a spring and a one-way valve which are sequentially connected, wherein a first small hole and a first circulation channel are arranged on the one-way valve, the first small hole is respectively communicated with the oil inlet channel and the first circulation channel, and the first circulation channel is communicated with the first cavity; the multi-way reversing valve is internally provided with a sliding groove, the first cavity is communicated with the oil return channel through a second flow channel and the sliding groove, the tail end of the second flow channel is provided with a second small hole, and the second small hole is arranged on the side wall of the sliding groove; the sliding groove is provided with a valve rod in a sliding mode, and the valve rod is used for plugging or releasing a second small hole of the second flow channel and controlling the connection or disconnection of the first cavity and the oil return channel.

Optionally, the oil inlet channel of the oil way of the movable arm oil cylinder is connected with the large cavity of the movable arm oil cylinder through the opening A, and the oil return channel of the oil way of the movable arm oil cylinder is connected with the small cavity of the movable arm oil cylinder.

Optionally, a first flow channel is arranged at the central position of the one-way valve, two first small holes are symmetrically arranged on the one-way valve, and the two first small holes are respectively communicated with the first flow channel.

Optionally, the aperture of the second small hole is larger than the sum of the apertures of the two first small holes.

Optionally, sliding connection is between the chamber wall of check valve and first cavity, and when the valve rod inserted in the sliding tray, first cavity and return oil way stop, and first cavity department is full of hydraulic oil, and the check valve is closed in the big chamber of movable arm hydro-cylinder to movable arm hydro-cylinder oil circuit.

Optionally, when the valve rod is pulled out from the sliding groove, the first cavity and the oil return channel are communicated through the second flow channel, the check valve releases the stop of the oil way of the movable arm oil cylinder, and hydraulic oil flows into the small cavity of the movable arm oil cylinder through the oil inlet channel and the oil return channel.

Optionally, the oil inlet channel of the oil circuit of the movable arm oil cylinder is arranged in a step shape, the first cavity is arranged at the step of the oil inlet channel, and the tail end of the oil inlet channel is communicated with the sliding groove.

Optionally, the spring holder detachable sets up in the multiple direction valve top, the spring holder end is provided with the spring, the spring end is connected with the check valve.

Optionally, the oil return channel is disposed on a valve rod moving path of the sliding groove.

Optionally, the upper portion of check valve and the big or small looks adaptation of first cavity, the bottom of check valve and the big or small looks adaptation of going into the oil duct, the middle part of check valve is provided with the pit, first aperture sets up in the pit.

A second aspect of the present utility model provides a multiple directional control valve for a hydraulically controlled hydraulic lock employing the multiple directional control valve of the first aspect of the present utility model.

The utility model has the following beneficial effects:

1. The utility model provides a hydraulic control hydraulic lock of a multi-way reversing valve of a tractor and the multi-way reversing valve.

2. The utility model realizes the reverse opening of the hydraulic lock by utilizing the throttle pressure difference principle, has compact design structure and reliable operation, is easy for mass production, can be applied to agricultural machinery, engineering machinery and the like which need to maintain the stay working condition of the load, and has wide application range.

3. The hydraulic lock of the multi-way valve of the utility model eliminates the traditional mechanical mechanism type hydraulic lock of the multi-way valve, avoids the situation that mechanical parts have hard connection friction and are easy to cause failure such as abrasion, clamping stagnation and the like, can well keep the pressure oil of the oil cylinder from leaking, realizes that the load of the tractor valve keeps not to be settled, can realize the safe decline of the load through the control handle, and has high control precision.

Of course, it is not necessary for any one product to practice the utility model to achieve all of the advantages set forth above at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a mechanical hydraulic lock in the prior art.

Fig. 2 is a schematic view of the cross-sectional structure along AA in fig. 1.

Fig. 3 is a schematic diagram of the overall structure of the hydraulic control hydraulic lock of the utility model.

Fig. 4 is a schematic sectional view of the structure of fig. 3 along BB.

In the drawings, the list of components represented by the various numbers is as follows:

The valve sleeve is provided with a valve sleeve, the circlip for 2 holes, the upper spring seat 3, the spring 4, the cone valve 5, the lower spring seat 6, the first steel ball 7, the ejector rod 8, the second steel ball 9, the valve rod 10, the small cavity 11, the large cavity 12, the oil return channel 13, the port 14A, the valve rod shoulder 15 and the movable arm cylinder 16;

The hydraulic control valve comprises a multi-way reversing valve 17, a hydraulic control hydraulic lock 18, an oil inlet passage 19, a first cavity 20, a spring seat 21, a one-way valve 22, a first small hole 23, a first circulation channel 24, a second circulation channel 25, a sliding groove 26 and a second small hole 27.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Noun interpretation:

And (3) hydraulic lock: the multi-way valve reversing valve controls the direction of pressure oil entering the oil cylinder, the oil cylinder drives the agricultural implement to realize ascending, neutral, descending and floating functions, and after the agricultural implement is lifted, the loop is locked and the loop oil is prevented from flowing, so that the oil cylinder can still keep the position of the oil cylinder still even if the outside has a certain load, and the load is kept at a preset height.

Check valve: the one-way valve is a direction control valve in which liquid can flow only in one direction and cannot flow reversely.

Multiple directional control valve: each engineering machine is used for completing certain work tasks, and a working device of the engineering machine comprises several components, for example: the working device of the loader consists of a bucket and an arm mechanism; the tractor working device is composed of an agricultural implement overturning and lifting mechanism.

Spool valve function type Q: the four-position six-way multi-way valve controls the direction of pressure oil entering oil cylinder oil liquid, and the oil cylinder drives farm machinery to realize ascending, neutral, descending and floating functions.

The hydraulic working system of the tractor is generally composed of an oil tank, a hydraulic pump, a multi-way valve and an oil cylinder; the engine drives the hydraulic pump to absorb oil from the oil tank, outputs pressure oil to the port P of the multi-way valve, the port T of the multi-way valve is connected with the oil tank for oil return, and the port A, B of the multi-way valve is connected with the upper cavity and the lower cavity of the oil cylinder. When the valve rod of the multi-way valve is controlled to change the direction of oil flow, the piston rod of the oil cylinder is controlled to stretch and retract, and the piston rod drives the farm machinery of the tractor to realize the function of three-position and four-position.

As shown in fig. 1 and 2, a hydraulic lock of a hydraulic working multi-way valve of a tractor in the prior art is mainly a mechanical mechanism device and comprises a valve sleeve 1, a circlip 2 for holes, an upper spring seat 3, a spring 4, a cone valve 5, a lower spring seat 6, a first steel ball 7, a push rod 8, a second steel ball 9 and a valve rod 10. The mechanical unloading structure of the hydraulic lock for the multi-way valve of the tractor has hard contact friction of parts in the operation process, and is easy to cause failure modes such as abrasion, clamping stagnation and the like, so that the hydraulic lock has a plurality of faults and short service life.

Embodiment one:

Referring to fig. 3-4, the present embodiment provides a hydraulic control hydraulic lock for a multi-way reversing valve of a tractor, which includes a multi-way reversing valve 17 and a boom cylinder 16 for controlling lifting or lowering of a boom, wherein an oil path of the boom cylinder 16 and a hydraulic control hydraulic lock 18 for controlling on and off of the oil path of the boom cylinder 16 are provided in the multi-way reversing valve 17, the oil path of the boom cylinder 16 includes an oil inlet path 19 and an oil return path 13, as shown in fig. 4, the overall shape of the oil path of the boom cylinder 16 is in a stepped and vertical arrangement, and the end of the oil path of the stepped boom cylinder 16 is provided with the oil return path 13.

The lower part of the multi-way reversing valve 17 is provided with a sliding groove 26, the sliding groove 26 is transversely arranged, the tail end of the oil inlet channel 19 is communicated with the sliding groove 26, the oil return channel 13 is arranged on the moving path of the valve rod 10 of the sliding groove 26, and the oil return channel 13 and the sliding groove 26 are partially overlapped. The valve stem 10 is provided with a valve stem shoulder 15.

In a specific arrangement, the oil inlet channel 19 of the oil channel of the boom cylinder 16 is arranged in a step shape, and the first cavity 20 is arranged above the step of the oil inlet channel 19, so that the step of the oil inlet channel 19 is conveniently plugged by the check valve 22.

In order to control the boom, the oil inlet channel 19 of the oil channel of the boom cylinder 16 is connected with the large cavity 12 of the boom cylinder 16 through the port a 14, and the oil return channel 13 of the oil channel of the boom cylinder 16 is connected with the small cavity 11 of the boom cylinder 16, so that the control of the boom can be realized by controlling the flow direction of hydraulic oil in the large cavity 12 and the small cavity 11.

The hydraulic control hydraulic lock 18 in the present embodiment seals the hydraulic oil in the large chamber 12 by using the check valve 22, and simultaneously performs hydraulic unloading control by applying the throttle differential pressure principle. Specifically, the first cavity 20 for accommodating the hydraulic control hydraulic lock 18 is disposed in the multiple directional control valve 17, the hydraulic control hydraulic lock 18 includes a spring seat 21, a spring 4 and a check valve 22 that are sequentially connected, the spring seat 21, the spring and the check valve 22 are disposed in the first cavity 20, and the check valve 22 is slidably connected with a side wall of the first cavity 20, so that the step of the oil inlet channel 19 can be plugged or released by using extension or retraction of the check valve 22.

When the check valve 22 is retracted, the step of the oil inlet channel 19 is unblocked, the oil inlet channel 19 is communicated with the oil return channel 13, and hydraulic oil flows into the small cavity 11 of the movable arm oil cylinder 16 through the oil return channel 13; when the check valve 22 extends, the step of the oil inlet channel 19 is blocked by the tail end of the extending check valve 22, and at the moment, the valve rod 10 is matched with the sliding groove 26, so that the space in the first cavity 20 can be filled with hydraulic oil through the check valve 22, the hydraulic oil flows into the large cavity 12 of the movable arm oil cylinder 16 through the first cavity 20, the hydraulic oil is blocked in the large cavity 12 of the movable arm oil cylinder 16, the hydraulic oil in the large cavity 12 is sealed, and further the movable arm action (hovering) is kept.

In order to realize the communication of hydraulic oil between the oil inlet channel 19 and the large cavity 12, the check valve 22 is provided with a first small hole 23 and a first communication channel 24, the first small hole 23 is respectively communicated with the oil inlet channel 19 and the first communication channel 24, and the first communication channel 24 is communicated with the first cavity 20; the multi-way reversing valve 17 is internally provided with a sliding groove 26, the first cavity 20 is communicated with the oil return duct 13 through a second circulation channel 25 and the sliding groove 26, the tail end of the second circulation channel 25 is provided with a second small hole 27, and the second small hole 27 is arranged on the side wall of the sliding groove 26.

In order to unlock the hydraulic control lock 18, a valve rod 10 is slidably disposed in the sliding groove 26, and the valve rod 10 is used for plugging or releasing the second small hole 27 of the second flow channel 25, so as to control the on or off of the first cavity 20 and the oil return channel 13. When the valve rod 10, the first cavity 20 and the oil return channel 13 are pulled out to be communicated, the hydraulic oil in the first cavity 20 starts to be decompressed, so that the one-way valve 22 slides upwards along the side wall of the first cavity 20, the oil inlet channel 19 and the oil return channel 13 are communicated, and the hydraulic oil flows into the small cavity 11 through the oil return channel 13. When the valve rod 10 is inserted into the sliding groove 26, the second orifice 27 can be blocked by the valve rod 10, so that the pressure in the first cavity 20 is maintained.

As shown in fig. 4, a first flow channel 24 is disposed in the central position of the check valve 22, two first small holes 23 are symmetrically disposed on the check valve 22, and the two first small holes 23 are respectively communicated with the first flow channel 24. In order to achieve pressure control of the first cavity 20, when the valve stem 10 is pulled out, the flow rate of the hydraulic oil flowing out through the second small hole 27 is larger than the flow rate of the hydraulic oil flowing in the first small hole 23, and in this embodiment, the aperture of the second small hole 27 is larger than the sum of the apertures of the two first small holes 23.

The check valve 22 is slidably connected to the wall of the first cavity 20, and the operation of the valve rod 10 is as follows:

When the valve rod 10 is inserted into the sliding groove 26, the first cavity 20 and the oil return channel 13 are cut off, the first cavity 20 is filled with hydraulic oil, the check valve 22 cuts off an oil way of the movable arm oil cylinder 16, and the hydraulic oil is sealed in the large cavity 12 of the movable arm oil cylinder 16;

When the valve rod 10 is pulled out from the sliding groove 26, the first cavity 20 and the oil return passage 13 are communicated with the sliding groove 26 through the second flow passage 25, the check valve 22 releases the blocking of the oil passage of the boom cylinder 16, and hydraulic oil flows into the small cavity 11 of the boom cylinder 16 through the oil inlet passage 19 and the oil return passage 13.

It will be appreciated that, in order to maintain the pressure in the first cavity 20, the upper portion of the check valve 22 is adapted to the size of the first cavity 20, and the bottom portion of the check valve 22 is adapted to the size of the oil inlet passage 19. The middle part of the check valve 22 is provided with a recess, and the first small hole 23 is arranged in the recess. The spring seat 21 is detachably arranged at the top of the multi-way reversing valve 17, the tail end of the spring seat 21 is provided with a spring, and the tail end of the spring is connected with a one-way valve 22.

After the multi-way reversing valve 17 on the tractor lifts the auxiliary tool to a preset position through reversing, the vehicle is transferred to a working position, and the auxiliary tool is required to be prevented from settling in the moving process, because a gap exists between the valve hole of the multi-way valve reversing valve and the valve rod 10 in the prior art, the auxiliary tool cannot be prevented from settling, the pressure oil of the oil cylinder cannot be kept from leaking, and further safety in the running process of the vehicle is not guaranteed.

The embodiment provides the hydraulic control hydraulic lock 18 which has a simple and compact structure and is convenient to install and arrange, the load of the tractor valve is kept not to be settled, and the load can be safely lowered through the operating handle.

When the valve rod 10 is pushed in, hydraulic oil opens the check valve 22 to enter the large oil cylinder cavity 12 from the port A14, after a heavy object is pushed to a preset position, the valve rod 10 returns to the middle position, and the heavy object is kept at the preset position, because the check valve 22 reversely seals oil in the large oil cylinder cavity 12, the vehicle can carry long-distance transportation by carrying, meanwhile, oil enters the first cavity 20 from the small hole phi 0.6 of the check valve 222, the first cavity 20 is also sealed, and the pressure is the same as that of the large oil cylinder cavity 12.

When the valve rod 10 is pulled out, the second small hole 27 of phi 2.5 at the tail end of the second flow passage 25 of the valve body is exposed, the oil in the first cavity 20 is communicated with the oil return passage 13 through the second small hole 27 of phi 2.5, because the area of the second small hole 27 of phi 2.5 is larger than that of the first small holes 23 of the two diameters 0.6 of the check valve 22, the unloading flow of the second small hole 27 of phi 2.5 is larger than that of the first small holes 23 of the two diameters 0.6, the pressure of the first cavity 20 is reduced than that of the sliding groove 26 and the backflow, the sealing strong pressure of the first cavity 20 is lower than that of the large cavity 12 of the oil cylinder, the pressure difference is formed, the check valve 22 is reversely opened by the high-pressure oil in the large arm, and the high-pressure oil flows to the oil return passage 13 through the opening of the valve core movement, so that the auxiliary device is lowered.

Embodiment two:

the embodiment provides a multi-way reversing valve.

The multi-way reversing valve comprises a multi-way reversing valve body and the hydraulic control hydraulic lock of the multi-way reversing valve of the tractor, which is arranged on the multi-way reversing valve body.

In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the utility model disclosed above are intended only to assist in the explanation of the utility model. The preferred embodiments are not exhaustive or to limit the utility model to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model. The utility model is limited only by the claims and the full scope and equivalents thereof.

Claims (10)

1. The hydraulic control hydraulic lock for the multi-way reversing valve of the tractor is characterized by comprising a multi-way reversing valve and a movable arm oil cylinder for controlling the lifting or the lowering of a movable arm, wherein a movable arm oil cylinder oil way and a hydraulic control hydraulic lock for controlling the on and off of the movable arm oil cylinder oil way are arranged in the multi-way reversing valve, the movable arm oil cylinder oil way comprises an oil inlet passage and an oil return passage, and a first cavity for accommodating the hydraulic control hydraulic lock is arranged in the multi-way reversing valve; the hydraulic control hydraulic lock comprises a spring seat, a spring and a one-way valve which are sequentially connected, wherein a first small hole and a first circulation channel are arranged on the one-way valve, the first small hole is respectively communicated with the oil inlet channel and the first circulation channel, and the first circulation channel is communicated with the first cavity; the multi-way reversing valve is internally provided with a sliding groove, the first cavity is communicated with the oil return channel through a second flow channel and the sliding groove, the tail end of the second flow channel is provided with a second small hole, and the second small hole is arranged on the side wall of the sliding groove; the sliding groove is provided with a valve rod in a sliding mode, and the valve rod is used for plugging or releasing a second small hole of the second flow channel and controlling the connection or disconnection of the first cavity and the oil return channel.

2. The hydraulic control lock of a multi-way reversing valve of a tractor according to claim 1, wherein an oil inlet passage of the oil passage of the movable arm oil cylinder is connected with a large cavity of the movable arm oil cylinder through an opening A, and an oil return passage of the oil passage of the movable arm oil cylinder is connected with a small cavity of the movable arm oil cylinder.

3. The hydraulic control lock for the multi-way reversing valve of the tractor according to claim 1, wherein a first flow channel is arranged in the center of the one-way valve, two first small holes are symmetrically arranged on the one-way valve, and the two first small holes are respectively communicated with the first flow channel.

4. A tractor multiple directional valve hydraulic control hydraulic lock according to claim 3, wherein the second aperture has a larger aperture than the sum of the apertures of the two first apertures.

5. The hydraulic control hydraulic lock of the multi-way reversing valve of the tractor according to claim 4, wherein the check valve is in sliding connection with the cavity wall of the first cavity, when the valve rod is inserted into the sliding groove, the first cavity and the oil return channel are blocked, hydraulic oil is filled in the first cavity, the check valve is blocked for an oil way of the movable arm oil cylinder, and the hydraulic oil is sealed in a large cavity of the movable arm oil cylinder.

6. The hydraulic control lock of a multi-way reversing valve for a tractor according to claim 4, wherein when the valve rod is pulled out from the sliding groove, the first cavity and the oil return channel are communicated with the sliding groove through the second flow channel, the check valve releases the stop of the oil way of the movable arm oil cylinder, and hydraulic oil flows into the small cavity of the movable arm oil cylinder through the oil inlet channel and the oil return channel.

7. The hydraulic control lock for a multi-way reversing valve of a tractor according to claim 1, wherein the oil inlet passage of the oil circuit of the movable arm oil cylinder is arranged in a step shape, the first cavity is arranged at the step of the oil inlet passage, and the tail end of the oil inlet passage is communicated with the sliding groove.

8. The hydraulic control lock for a multi-way reversing valve of a tractor according to claim 1, wherein the spring seat is detachably arranged at the top of the multi-way reversing valve, a spring is arranged at the tail end of the spring seat, the tail end of the spring is connected with a one-way valve, and the oil return channel is arranged on a valve rod moving path of the sliding groove.

9. The hydraulic control lock for the multi-way reversing valve of the tractor according to claim 1, wherein the upper portion of the one-way valve is matched with the first cavity in size, the bottom of the one-way valve is matched with the oil inlet passage in size, the middle of the one-way valve is provided with a concave portion, and the first small hole is formed in the concave portion.

10. A multiple directional control valve, characterized by comprising a multiple directional control valve body and the tractor multiple directional control valve hydraulic control hydraulic lock according to any one of claims 1-9 arranged on the multiple directional control valve body.