Brake valve core assembly and brake valve group

Abstract

The utility model relates to the technical field of hydraulic systems, in particular to a brake valve core assembly and a brake valve group. A brake valve element assembly comprises a valve element body, a valve element, a valve element, a valve element, a valve element and a valve element cover, and a throttling hole is formed in the valve element body; the throttling assembly is assembled in the throttling hole, the throttling assembly comprises a first steel ball and a first screw plug, the first steel ball is movably limited in the throttling hole by the first screw plug, a first through hole is formed in the first screw plug, and a second through hole is formed in the second steel ball; a notch communicated with the first through hole is formed in the end, close to the first steel ball, of the first plug. The utility model also provides a brake valve group, which comprises a valve body and a valve core, and the brake valve core assembly is assembled in the valve body. The technical problems that in the prior art, an annular gap is adopted by a brake valve set for throttling, the throttling flow is not easy to control, and the control precision is low are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of hydraulic pressure, concretely relates to a brake valve core subassembly and brake valve group. BACKGROUND

[0002] At present, brake valve group is an important control element in hydraulic system, is used for preventing the cavitation of the oil suction side, the pressure overpressure of the oil outlet side and the dither problem of motor commutation caused by motor overspeed and emergency stop. The plunger motor is driven by the hydraulic pump, and reciprocates in the valve body through the brake valve core, so that the oil outlet and the oil inlet of the motor are opened or closed.

[0003] The file with the application number CN202111105968.7 discloses a bidirectional balance valve, including balance valve body, balance valve core, first one-way valve assembly, second one-way valve assembly, shuttle valve and brake control valve, the first oil channel, second oil channel, third oil channel, fourth oil channel, fifth oil channel, control valve oil channel, pressure relief oil channel and pressure measurement oil channel are opened on the balance valve body, oil port A, oil port B, oil port A1, oil port B1, oil port Br, oil supplement port S, oil discharge port L and pressure measurement oil port G are arranged on the balance valve body, the first oil channel is through to oil port A1, the second oil channel is through to oil port B1, the third oil channel is through to oil supplement port S, the fourth oil channel is through to oil port B, the fifth oil channel is through to oil port A, the control valve oil channel is through to oil port Br, the pressure relief oil channel is through to oil discharge port L, the pressure measurement oil channel is through to pressure measurement oil port G, the balance valve cavity, first installation cavity, second installation cavity and third installation cavity are opened on the balance valve body, the first oil channel, second oil channel, third oil channel are all through to the balance valve cavity, the second oil channel, third oil channel, fourth oil channel 104 are respectively through to the second installation cavity, the first oil channel, third oil channel, fifth oil channel are through to the first installation cavity, the control valve oil channel, pressure relief oil channel, pressure measurement oil channel are all through to the third installation cavity, the balance valve core is installed in the balance valve cavity, the first one-way valve assembly is installed in the first installation cavity, the second one-way valve assembly is installed in the second installation cavity, the brake control valve is installed in the third installation cavity, the brake control valve and the balance valve body are provided with O-ring for sealing, one end of the balance valve cavity is provided with end cover, the other end is provided with cover plate, the end cover and the balance valve core form pilot chamber, the pilot chamber and oil port A are provided with oil inlet oil channel, the oil inlet oil channel is provided with oil inlet damping, the two ends of the balance valve core are respectively provided with one-way damping valve, the unloading oil channel is formed from the pilot chamber to oil port A through one-way damping valve, the balance valve core is provided with balance valve throttle groove that can pass through the first oil channel and the third oil channel or can pass through the second oil channel and the third oil channel, the first oil hole is through to the pressure relief oil channel, the second oil hole is through to the control valve oil channel, the third oil hole is through to the pressure measurement oil channel.

[0004] The spool type balance valve spool is adopted in the above-mentioned file, pressure oil is switched left and right stably through the set oil inlet damping control balance valve spool, when the balance valve spool resets and closes, the pressure oil of the pilot cavity is quickly unloading through the set damping valve sleeve and damping valve spool, so as to eliminate the micro opening jitter in the switching process of the balance valve spool, and reduce the impact pressure at the moment of starting and closing the hydraulic motor. However, the oil inlet damping adopts the annular gap between the balance valve spool and the balance valve cavity for throttling, and the throttling flow is not easy to control, and the control precision is low. Practical new type content

[0005] In order to solve the technical problems that the throttling flow is not easy to control and the control precision is low in the prior art, the utility model provides a brake valve core assembly and brake valve group, which solves the above technical problems.

[0006] In order to solve the above technical problems, the utility model provides a brake valve core assembly, which comprises:

[0007] The valve core body is formed with a throttling hole;

[0008] The throttling assembly is assembled in the throttling hole, the throttling assembly comprises a first steel ball and a first screw plug, the first steel ball is movably limited in the throttling hole by the first screw plug, the first screw plug is formed with a first through hole, and the end of the first screw plug close to the first steel ball is formed with a notch in communication with the first through hole.

[0009] According to one embodiment of the utility model, the valve core body is formed with a flow hole, and a one-way assembly is assembled in the flow hole.

[0010] According to one embodiment of the utility model, the one-way assembly comprises a one-way valve core, a second steel ball and a second screw plug, the second steel ball is located between the one-way valve core and the second screw plug, the second screw plug is fixedly assembled, the second screw plug is formed with a second through hole, and the one-way valve core pushes the second steel ball against the second screw plug under the action of the elastic piece, so as to block the second through hole.

[0011] According to one embodiment of the utility model, the throttling hole and the flow hole are both provided with two, two throttling holes are located at two ends of the valve core body, and two flow holes are located at two ends of the valve core body.

[0012] According to one embodiment of the utility model, the first ends of the throttling hole and the flow hole all extend to the end face of the valve core body, the second ends of the throttling hole and the flow hole all extend to the outer peripheral surface of the valve core body, and the second ends of the throttling hole and the flow hole located at the same end of the valve core body are located on the same circumference.

[0013] According to one embodiment of the utility model, the middle part of valve core body is formed with annular groove, the both sides of annular groove are symmetrically formed with throttle groove, and the throttle groove includes at least two levels of axially extending arc grooves.

[0014] A brake valve group comprises:

[0015] A valve body;

[0016] A brake valve core assembly is assembled in the valve body;

[0017] The valve body is formed with oil port A, oil port B, oil port AA and oil port BB, one of the oil port A and oil port B is used to introduce pressure oil, and the other is used to return oil, one of the oil port AA and oil port BB is used to import oil, and the other is used to return oil; the oil port A and oil port AA correspond to oil passage, the oil port B and oil port BB correspond to oil passage, the pressure oil introduced by the oil port A can be directly supplied to the oil port AA, and the oil outlet oil of the oil port AA is returned to the oil port A through the brake valve core assembly; the pressure oil introduced by the oil port B can be directly supplied to the oil port BB, and the oil outlet oil of the oil port BB is returned to the oil port B through the brake valve core assembly.

[0018] According to one embodiment of the utility model, the valve body is provided with first oil channel, second oil channel and third oil channel, the oil port AA is communicated with the first oil channel, the oil port BB is communicated with the second oil channel, the brake valve core assembly controls the first oil channel and the third oil channel to be communicated or the second oil channel and the third oil channel to be communicated, and the third oil channel is respectively communicated with the oil port A and the oil port B in one way.

[0019] According to one embodiment of the utility model, the brake valve core assembly is formed with pilot chamber at both ends, the two pilot chambers are communicated with the oil port A and the oil port B respectively, the pressure oil introduced by the oil port A or the oil port B enters the corresponding pilot chamber through the throttle hole, and the oil in the pilot chamber flows out through the flow hole.

[0020] According to one embodiment of the utility model, the valve body is provided with two groups of one-way valve groups, the first one-way valve group controls the oil flow direction between the oil port A and the oil port AA, when the oil port A introduces pressure oil, the oil port A is supplied to the oil port AA in one way through the first one-way valve group, the oil port AA imports oil, when the oil port AA exports oil, the oil outlet oil of the oil port AA is returned to the oil port A in one way through the brake valve core assembly and the first one-way valve group; the second one-way valve group controls the oil flow direction between the oil port B and the oil port BB, when the oil port B introduces pressure oil, the oil port B is supplied to the oil port BB in one way through the second one-way valve group, the oil port BB imports oil, when the oil port BB exports oil, the oil outlet oil of the oil port BB is returned to the oil port B in one way through the brake valve core assembly and the second one-way valve group.

[0021] Based on the technical solutions, the brake valve core assembly can achieve the following technical effects:

[0022] 1. The brake valve core assembly of the utility model, through setting throttling hole in valve core body, setting throttling assembly in throttling hole, throttling assembly includes first steel ball and first screw plug, by setting first screw plug has first through hole, and setting first screw plug forms gap communicated with first through hole, then can pass through adjusting gap size to carry out throttling flow control. When needing to adjust throttling flow, can pass through selecting first screw plug of different gap size, adjustment mode is simple, and cost is low;

[0023] 2. The brake valve core assembly of the utility model, the valve core body is also provided with overflow hole, the overflow hole and the throttling hole are two respectively, and are located at both ends of the valve core body, the first end of the throttling hole and the overflow hole extends to the end face of the valve core body, the second end of the throttling hole and the overflow hole extends to the outer peripheral surface of the valve core body, and is located in the same circumferential direction, the oil inlet and oil outlet of the pilot chamber at both ends of the valve core body can be conveniently realized;

[0024] 3. The brake valve core assembly of the utility model, the annular groove of the middle part of the valve core body is also formed with throttling groove on both sides, the throttling groove includes at least two levels of axially extending arc grooves, the overflow area is enlarged, the valve core reversing stroke is shortened, and the response time of motor oil return when reversing to the middle position is reduced;

[0025] 4. The brake valve group of the utility model, by setting throttling structure, the throttling flow of the oil inlet and outlet of the pilot chamber at both ends of the valve core body can be controlled, and then the response speed of the brake valve group is adjusted and controlled, to prevent the valve core body from returning to the middle position, the motor oil outlet cannot timely pressure relief, and the problems of instantaneous overpressure and motor shaking when reversing occur. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the structure schematic view of the brake valve core assembly of the utility model;

[0027] Figure 2 It is the structure schematic view of throttling assembly assembled in the valve core body;

[0028] Figure 3 It is the structure schematic view of one-way assembly assembled in the valve core body;

[0029] Figure 4 It is the structure schematic view of the valve core body;

[0030] Figure 5 It is the A-A section view of Figure 4 ;

[0031] Figure 6 It is the A-A section view of Figure 5B-B sectional view of the brake valve group of the utility model;

[0032] Figure 7 It is the structure schematic view of brake valve group of the utility model;

[0033] Figure 8 It is the structure schematic view of brake valve group in another view;

[0034] Figure 9 It is the sectional view of brake valve group;

[0035] Figure 10 It is Figure 9 The enlarged view of C part;

[0036] Figure 11 It is Figure 9 The enlarged view of D part;

[0037] Figure 12 It is the hydraulic principle diagram of brake valve group;

[0038] In the figure: 1-valve core body;11-throttling hole;12-flow hole;13-annular groove;14-throttling groove;15-screw hole;2-throttling assembly;21-first steel ball;22-first screw plug;221-first through hole;222-notch;3-one-way assembly;31-one-way valve core;32-second steel ball;33-second screw plug;331-second through hole;34-elastic member;4-valve body;41-oil port A;42-oil port B;43-oil port AA;44-oil port BB;45-first oil channel;46-second oil channel;47-third oil channel;51-first one-way valve group;511-first one-way valve;5111-first valve seat;5112-first valve core;5113-first elastic member;512-second one-way valve;5121-second valve seat;5122-second valve core;5123-second elastic member;52-second one-way valve group;521-third one-way valve;5211-third valve seat;5212-third valve core;5213-third elastic member;522-fourth one-way valve;5221-fourth valve seat;5222-fourth valve core;5223-fourth elastic member;6-screw;7-spring;71-spring seat;81-plug;82-sleeve. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is merely illustrative in nature and in no way should be construed as any limitation on the present application and its applications or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present application.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0041] The relative arrangement of components and steps, numerical expressions, and numerical values set forth in the embodiments are not intended to limit the scope of the present application unless specifically stated otherwise. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the specification under appropriate circumstances. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of the example embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so further discussion is not necessary once an item is defined in one drawing.

[0042] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0043] For ease of description, spatial relative terms such as "on", "above", "top surface", "upper", and the like can be used herein to describe the spatial relationship between one device or feature and another device or feature as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, the device described as "above" or "on" the other device or structure would then be positioned "below" or "under" the other device or structure. Thus, the exemplary term "above" can include both the "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatial relative descriptions used herein interpreted accordingly.

[0044] In addition, it should be noted that the use of the terms "first", "second", and the like to describe various components is merely intended to distinguish one component from another, and such terms do not have special meanings unless otherwise stated. Therefore, it cannot be understood as a limitation on the scope of protection of the utility model.

[0045] As shown in the drawings, the embodiment provides a brake spool assembly, which comprises a spool body 1, a throttle hole 11 is formed in the spool body 1, and a throttle assembly 2 is assembled in the throttle hole 11. In this way, the throttle flow can be controlled through the throttle hole 11 and the throttle assembly 2. Compared with the prior art, the throttle flow is controlled through the annular gap between the brake spool and the valve body, and the control precision is poor. The throttle hole 11 and the throttle assembly 2 of the embodiment are more easy to control the throttle flow, and the control precision is high. Figures 1-6 As shown in the drawings, the spool body 1 is columnar, a throttle hole 11 is formed in the spool body 1, and a throttle assembly 2 is assembled in the throttle hole 11. The first end of the throttle hole 11 extends to the end face of the spool body 1, and the second end of the throttle hole 11 extends to the outer peripheral surface of the spool body 1, so as to facilitate the oil flow at the outer peripheral surface of the spool body 1 and the oil flow at the end face of the spool body 1. A flow hole 12 is further formed in the spool body 1, a one-way assembly 3 is assembled in the flow hole 12, the first end of the flow hole 12 extends to the end face of the spool body 1, and the second end of the flow hole 12 extends to the outer peripheral surface of the spool body 1, so as to facilitate the one-way flow of the oil at the end face of the spool body 1 to the outer peripheral surface of the spool body 1.

[0046] Figures 4-6 As a preferred technical solution of the embodiment, the throttle hole 11 is provided as two, and the two throttle holes 11 are distributed at the two ends of the spool body 1. The two throttle holes 11 are symmetrically arranged at the two ends of the spool body 1. Further, the two throttle holes 11 are centrally symmetrically arranged at the two ends of the spool body 1.

[0047] As a preferred technical solution of the embodiment, the throttle hole 11 is provided as two, and the two throttle holes 11 are distributed at the two ends of the spool body 1. The two throttle holes 11 are symmetrically arranged at the two ends of the spool body 1. Further, the two throttle holes 11 are centrally symmetrically arranged at the two ends of the spool body 1. ​

[0048] As a preferred technical solution of the embodiment, the throttle hole 11 comprises a first axial part and a first radial part in communication, the first axial part extends parallel to the axis, and the first axial part extends to the adjacent end face from one end away from the first radial part, and the first radial part extends radially, and the first radial part extends to the outer circumferential surface of the valve core body 1 from one end away from the first axial part.

[0049] As a preferred technical solution of the embodiment, the flow hole 12 is provided in two, and the two flow holes 12 are distributed at both ends of the valve core body 1. The two flow holes 12 are symmetrically arranged at both ends of the valve core body 1, and further, the two flow holes 12 are centrally symmetrically arranged at both ends of the valve core body 1.

[0050] As a preferred technical solution of the embodiment, the flow hole 12 comprises a second axial part and a second radial part in communication, the second axial part extends parallel to the axis, and the second axial part extends to the adjacent end face from one end away from the second radial part, and the second radial part extends radially, and the second radial part extends to the outer circumferential surface of the valve core body 1 from one end away from the second axial part.

[0051] As a preferred technical solution of the embodiment, the throttle hole 11 and the second end of the flow hole 12 located at the same end of the valve core body 1 are located on the same circumference, facilitating the circulation of oil.

[0052] As a preferred technical solution of the embodiment, an annular groove 13 is formed on the outer circumferential surface of the middle part of the valve core body 1, and throttle grooves 14 are symmetrically formed on both sides of the annular groove 13, and the throttle grooves 14 comprise at least two levels of axially extending arc-shaped grooves.

[0053] As shown in Figures 1-2 The throttle hole 11 is fitted with a throttle assembly 2, the throttle assembly 2 comprises a first steel ball 21 and a first screw plug 22, the first screw plug 22 is formed with a first through hole 221, and the first steel ball 21 is movably limited in the throttle hole 11 by the first screw plug 22.

[0054] As a preferred technical solution of the embodiment, the throttle assembly 2 is assembled in the first axial part of the throttle hole 11, and the first screw plug 22 is assembled at one end of the throttle hole 11 close to the end face.

[0055] As a preferred technical solution of the embodiment, the second axial part of the throttle hole 11 is formed with an inner tapered surface, and the first steel ball 21 is movably limited in range by the first screw plug 22 and the inner tapered surface.

[0056] As a preferred technical solution of the embodiment, one end of the first screw plug 22 close to the first steel ball 21 is formed with a notch 222, and the notch 222 is in communication with the first through hole 221. Preferably, a first screw plug with multiple specifications of notches can be provided, and the throttle flow can be controlled by selecting different specifications of notches, and the control mode is simple and the control precision is high.

[0057] As shown in Figure 1 , a one-way assembly 3 is assembled in the overflow hole 12, the one-way assembly 3 includes a one-way valve core 31, a second steel ball 32 and a second screw plug 33, the second screw plug 33 is provided with a second through hole 331, the second steel ball 32 is located between the one-way valve core 31 and the second screw plug 33, and in the initial state, the one-way valve core 31 pushes the second steel ball 32 against the second screw plug 33 under the action of the elastic element 34 pair, and blocks the second through hole 331. Preferably, the elastic element 34 is sleeved on the one-way valve core 31, one end of the elastic element 34 abuts against the hole wall of the overflow hole 12, and the other end of the elastic element 34 abuts against the one-way valve core 31.

[0058] As a preferred technical solution of the embodiment, the one-way assembly 3 is assembled in the second axial part of the overflow hole 12, and the second screw plug 33 is assembled at one end of the overflow hole 12 close to the end face.

[0059] As shown in Figures 7-12 , the embodiment also provides a brake valve group, which comprises a valve body 4, a plurality of oil ports and a plurality of oil channels are formed in the valve body 4, a brake valve core assembly is assembled in the valve body 4, and the brake valve core assembly controls the on-off of the oil channels.

[0060] The valve body 4 is provided with a mounting cavity, the brake valve core assembly is slidingly assembled in the mounting cavity, the valve body 4 close to the first end of the brake valve core assembly is provided with a plug 81, and a first pilot cavity is formed between the end face of the brake valve core assembly and the plug 81; the valve body 4 close to the second end of the brake valve core assembly is provided with a screw sleeve 82, and a second pilot cavity is formed between the end face of the brake valve core assembly and the screw sleeve 82. The brake valve core assembly controls the on-off of the oil channels under the action of the pilot oil.

[0061] As a preferred technical solution of the embodiment, the second end of the brake valve core assembly is provided with a screw hole 15 to connect the screw rod 6, the spring 7 is sleeved on the screw rod 6, and the two ends of the spring 7 are respectively provided with spring seats 71, one spring seat 71 abuts against the screw sleeve 82, and the other spring seat 71 abuts against the valve body 4. In the initial state, the spring 7 is in the pre-compressed state.

[0062] As shown in Figures 7-8As shown, the valve body 4 is formed with an oil port A 41, an oil port B 42, an oil port AA 43 and an oil port BB 44, one of the two oil ports A 41 and B 42 is used to introduce pressure oil, and the other is used to return oil; one of the two oil ports AA 43 and BB 44 is used to introduce oil, and the other is used to discharge oil. The oil ports A 41 and AA 43 correspond to oil supply, the oil ports B 42 and BB 44 correspond to oil supply, the pressure oil introduced by the oil port A 41 can be directly supplied to the oil port AA 43, and the oil discharged from the oil port AA 43 is returned to the oil port A 41 through the brake valve core assembly; the pressure oil introduced by the oil port B 42 can be directly supplied to the oil port BB 44, and the oil discharged from the oil port BB 44 is returned to the oil port B 42 through the brake valve core assembly.

[0063] As a preferred technical solution of the embodiment, the oil port A 41 and the oil port B 42 are located on the same face of the valve body 4, the oil port AA 43 and the oil port BB 44 are located on the same face of the valve body 4, and the face where the oil port A 41 is located and the face where the oil port AA 43 is located are oppositely arranged. The oil port A 41 and the oil port AA 43 are oppositely arranged, and the oil port B 42 and the oil port BB 44 are oppositely arranged.

[0064] As a preferred technical solution of the embodiment, the first pilot cavity is in communication with the oil port A 41, and the second pilot cavity is in communication with the oil port B 42. Specifically, the oil port A 41 is in communication with the first pilot cavity through a first internal oil passage, one end of the first internal oil passage is in communication with the oil port A 41, and the other end of the first internal oil passage extends to the outer peripheral surface of the first end of the brake valve core assembly, so that the oil port A 41 and the first pilot cavity are in oil communication through the throttle hole 11 and the through-flow hole 12 of the first end of the brake valve core assembly; the oil port B 42 is in communication with the second pilot cavity through a second internal oil passage, one end of the second internal oil passage is in communication with the oil port B 42, and the other end of the second internal oil passage extends to the outer peripheral surface of the second end of the brake valve core assembly, so that the oil port B 42 and the second pilot cavity are in oil communication through the throttle hole 11 and the through-flow hole 12 of the second end of the brake valve core assembly.

[0065] As shown, Figure 9 The valve body 4 is provided with a first oil passage 15, a second oil passage 16 and a third oil passage 17, all of which are in communication with the installation cavity where the brake valve core assembly is located, the first oil passage 15 is in communication with the oil port AA 43, the second oil passage 16 is in communication with the oil port BB 44, the brake valve core assembly slides to control the communication between the first oil passage 15 and the third oil passage 17 or the communication between the second oil passage 16 and the third oil passage 17, and the third oil passage 17 is in one-way communication with the oil port A 41 and the oil port B 42, respectively.

[0066] As a preferred technical solution of the embodiment, the third oil passage 17 is located between the first oil passage 15 and the second oil passage 16, and the first oil passage 15 and the second oil passage 16 are symmetrically arranged on both sides of the third oil passage 17.

[0067] As shown,Figure 9 As shown, the valve body 4 is inserted with a one-way valve group to control the oil flow direction. Specifically, the one-way valve group is provided in two groups, i.e., a first one-way valve group 51 and a second one-way valve group 52, which are symmetrically inserted into the valve body 4. The first one-way valve group 51 controls the oil flow direction between the oil port A41 and the oil port AA43. When the oil port A41 introduces the pressure oil, the oil port A41 unidirectionally supplies oil to the oil port AA43 through the first one-way valve group 51, and the oil port AA43 is filled with oil. When the oil port AA43 discharges oil, the oil discharged from the oil port AA43 is unidirectionally returned to the oil port A41 through the first one-way valve group 51 after passing through the brake spool assembly.

[0068] As shown, Figure 10 The first one-way valve group 51 includes a first one-way valve 511 and a second one-way valve 512 assembled integrally. The first one-way valve 511 includes a first valve seat 5111, a first valve core 5112, and a first elastic member 5113. The first valve seat 5111 is fixedly assembled, the first valve core 5112 is slidingly assembled in the first valve seat 5111, and the first elastic member 5113 is located between the first valve seat 5111 and the first valve core 5112. The second one-way valve 512 includes a second valve seat 5121, a second valve core 5122, and a second elastic member 5123. The second valve seat 5121 is fixedly assembled, the second valve core 5122 is slidingly assembled in the second valve seat 5121, and the second elastic member 5123 is located between the second valve seat 5121 and the second valve core 5122.

[0069] As a preferred technical solution of the embodiment, the first valve core 5112 is a hollow structure with one end open, the first end of the second valve seat 5121 extends into the first valve core 5112, and the second end of the second valve seat 5121 is fixedly assembled. The outer peripheral surface of the first valve core 5112 is slidingly matched with the first valve seat 5111, and the inner peripheral surface of the first valve core 5112 is slidingly matched with the second valve seat 5121.

[0070] As a preferred technical solution of the embodiment, the first end of the second valve seat 5121 is formed with a first flow hole, and the second end of the second valve seat 5121 is formed with a second flow hole.

[0071] As a preferred technical solution of the embodiment, the valve body 4 is provided with a first insertion hole, an inner end of the first insertion hole is communicated with the third oil channel 47, and a circumference of the first insertion hole is communicated with the first oil channel 45. The first one-way valve group 51 is installed in the first insertion hole, the second valve core 5122 is arranged opposite to the third oil channel 47, the first valve seat 5111 and the second valve seat 5121 are both fixed on the valve body 4, in the initial state, the first valve core 5112 is abutted against the second end of the second valve seat 5121 under the action of the first elastic member 5113, thereby blocking the communication between the second flow hole and the first oil channel 45, and the second valve core 5122 is abutted against the inner wall of the first insertion hole under the action of the second elastic member 5123, thereby blocking the communication between the third oil channel 47 and the second flow hole. Preferably, the first insertion hole is located between the oil port A41 and the oil port AA43, the oil port A41 and the oil port AA43 are both communicated with the first insertion hole, when the high-pressure oil is introduced into the oil port A41, the high-pressure oil can enter between the second valve core 5122 and the second valve seat 5121, and then act on the first valve core 5112 through the second flow hole at the second end of the second valve seat 5121, thereby pushing the first valve core 5112 to slide and open against the action of the first elastic member 5113, and the high-pressure oil can reach the oil port AA43, and the oil port AA43 realizes oil inlet.

[0072] As shown in Figure 11 The second one-way valve group 52 includes a third one-way valve 521 and a fourth one-way valve 522 which are assembled integrally, the third one-way valve 521 includes a third valve seat 5211, a third valve core 5212 and a third elastic member 5213, the third valve seat 5211 is fixedly assembled, the third valve core 5212 is slidingly assembled in the third valve seat 5211, and the third elastic member 5213 is located between the third valve seat 5211 and the third valve core 5212. The fourth one-way valve 522 includes a fourth valve seat 5221, a fourth valve core 5222 and a fourth elastic member 5223, the fourth valve seat 5221 is fixedly assembled, the fourth valve core 5222 is slidingly assembled in the fourth valve seat 5221, and the fourth elastic member 5223 is located between the fourth valve seat 5221 and the fourth valve core 5222.

[0073] As a preferred technical solution of the embodiment, the third valve core 5212 is a hollow structure with one end being open, the first end of the fourth valve seat 5221 extends into the third valve core 5212, and the second end of the fourth valve seat 5221 is fixedly assembled. The outer peripheral surface of the third valve core 5212 is slidingly matched with the third valve seat 5211, and the inner peripheral surface of the third valve core 5212 is slidingly matched with the fourth valve seat 5221.

[0074] As a preferred technical solution of the embodiment, the first end of the fourth valve seat 5221 is formed with a third flow hole, and the second end of the fourth valve seat 5221 is formed with a fourth flow hole.

[0075] As a preferred embodiment, a second insertion hole is provided in the valve body 4. The inner end of the second insertion hole communicates with the third oil passage 47, and the circumferential direction of the second insertion hole communicates with the second oil passage 46. The second one-way valve assembly 52 is installed in the second insertion hole. The fourth valve core 5222 is positioned opposite the third oil passage 47. Both the third valve seat 5211 and the fourth valve seat 5221 are fixed on the valve body 4, with the third valve seat 5211 located outside the fourth valve seat 5221. In the initial state, the third valve core 5212, under the action of the third elastic member 5213, abuts against the second end of the fourth valve seat 5221, blocking the communication between the fourth flow hole and the second oil passage 46. Under the action of the fourth elastic member 5223, the fourth valve core 5222 abuts against the inner wall of the second insertion hole, blocking the communication between the third oil passage 47 and the fourth flow hole. Preferably, the second insertion hole is located between oil port B42 and oil port BB44. Both oil port B42 and oil port BB44 are connected to the second insertion hole. When high-pressure oil is introduced into oil port B42, the high-pressure oil can enter between the fourth valve core 5222 and the fourth valve seat 5221, and then act on the third valve core 5212 through the second flow hole at the second end of the fourth valve seat 5221, pushing the third valve core 5212 to slide open against the action of the third elastic element 5213. The high-pressure oil can reach oil port BB44, and oil port BB44 realizes oil inlet.

[0076] Based on the above structure, when the brake valve assembly in this embodiment is used with a hydraulic motor, oil port AA43 and oil port BB44 are respectively connected to two oil ports of the hydraulic motor, driving the hydraulic motor to rotate in both directions. The specific working principle is as follows:

[0077] like Figure 12 As shown, when the hydraulic motor rotates forward, high-pressure oil is introduced through port A41. One path of the high-pressure oil from port A41 passes through the first check valve 511 to port AA43, where oil enters. Another path flows through the first internal oil passage to the outer circumferential surface of the first end of the brake valve core assembly, then through the throttle orifice 11 and throttle assembly 2 into the first pilot chamber, pushing the brake valve core assembly to slide. The brake valve core assembly controls the connection between the second oil passage 46 and the third oil passage 47. At this time, the oil outlet from port BB44 flows through the second oil passage 46 and the brake valve core assembly to the third oil passage 47, then through the fourth check valve 522 to port B42 for return oil. When the hydraulic motor stops operating, the brake valve core assembly resets and closes. The pressure oil in the first pilot chamber of the brake valve core assembly flows back to port A41 through the overflow orifice 12 to relieve the pressure.

[0078] When the hydraulic motor is reversed, high pressure oil is introduced into the oil port B42, the high pressure oil of the oil port B42 passes through the third one-way valve 521 to the oil port BB44, and the oil port BB44 is fed with oil; the other way passes through the second internal oil channel to the outer peripheral surface of the second end of the brake spool assembly, and then enters the second pilot chamber through the throttle hole 11 and the throttle assembly 2 to push the brake spool assembly to slide, and the brake spool assembly controls the first oil channel 45 and the third oil channel 47 to be communicated. At this time, the oil outlet of the oil port AA43 passes through the first oil channel 45, the brake spool assembly and the third oil channel 47, and then passes through the second one-way valve 512 to the oil port A41 to return oil. When the hydraulic motor stops working, the brake spool assembly resets and closes, and the pressure oil in the second pilot chamber of the brake spool assembly flows back to the oil port B42 through the overflow hole 12 to relieve pressure.

[0079] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the purpose of the utility model.

Claims

1. A brake spool assembly characterized by, Comprising: a valve core body (1) having a throttle hole (11) formed therein; a throttle assembly (2) assembled in the throttle hole (11), the throttle assembly (2) comprising a first steel ball (21) and a first screw plug (22), the first steel ball (21) being movably limited in the throttle hole (11) by the first screw plug (22), the first screw plug (22) having a first through hole (221) formed therein, and the first screw plug (22) having a notch (222) formed at one end thereof proximate to the first steel ball (21) and communicating with the first through hole (221).

2. A brake spool assembly according to claim 1 wherein, The valve core body (1) has a flow-through hole (12) formed therein, and a one-way assembly (3) is assembled in the flow-through hole (12).

3. A brake spool assembly according to claim 2, wherein, The one-way assembly (3) comprises a one-way valve core (31), a second steel ball (32) and a second screw plug (33), the second steel ball (32) being located between the one-way valve core (31) and the second screw plug (33), and the second screw plug (33) being fixedly assembled, the second screw plug (33) having a second through hole (331) formed therein, and the one-way valve core (31) pushing the second steel ball (32) against the second screw plug (33) under the action of an elastic member (34) to block the second through hole (331).

4. A brake spool assembly according to any one of claims 2-3, characterized in that, The throttle hole (11) and the flow-through hole (12) are each provided in two, two throttle holes (11) being respectively located at two ends of the valve core body (1), and two flow-through holes (12) being respectively located at two ends of the valve core body (1).

5. A brake spool assembly according to claim 4 wherein, First ends of the throttle hole (11) and the flow-through hole (12) each extend to an end face of the valve core body (1), and second ends of the throttle hole (11) and the flow-through hole (12) each extend to an outer peripheral surface of the valve core body (1), and the second ends of the throttle hole (11) and the flow-through hole (12) located at the same end of the valve core body (1) are located on the same circumferential direction.

6. A brake spool assembly according to claim 1 wherein, An annular groove (13) is formed on a middle outer peripheral surface of the valve core body (1), and throttle grooves (14) are symmetrically formed on both sides of the annular groove (13), the throttle grooves (14) comprising at least two levels of axially extending arc-shaped grooves.

7. A brake valve group, characterized in that Comprising: a valve body (4); the brake valve core assembly of any one of claims 4-5 is assembled in the valve body (4); The valve body (4) is formed with oil port A (41), oil port B (42), oil port AA (43) and oil port BB (44), one of the oil port A (41) and the oil port B (42) is used to introduce pressure oil, and the other is used to return oil, one of the oil port AA (43) and the oil port BB (44) is used to enter oil, and the other is used to exit oil; the oil port A (41) and the oil port AA (43) correspond to oil passage, the oil port B (42) and the oil port BB (44) correspond to oil passage, and the pressure oil introduced by the oil port A (41) can be directly supplied to the oil port AA (43), and the oil outlet oil of the oil port AA (43) is returned to the oil port A (41) through the brake spool assembly; the pressure oil introduced by the oil port B (42) can be directly supplied to the oil port BB (44), and the oil outlet oil of the oil port BB (44) is returned to the oil port B (42) through the brake spool assembly.

8. A brake valve group according to claim 7, characterised in that The valve body (4) is formed with oil port A (41), oil port B (42), oil port AA (43) and oil port BB (44), one of the oil port A (41) and the oil port B (42) is used to introduce pressure oil, and the other is used to return oil, one of the oil port AA (43) and the oil port BB (44) is used to enter oil, and the other is used to exit oil; the oil port A (41) and the oil port AA (43) correspond to oil passage, the oil port B (42) and the oil port BB (44) correspond to oil passage, and the pressure oil introduced by the oil port A (41) can be directly supplied to the oil port AA (43), and the oil outlet oil of the oil port AA (43) is returned to the oil port A (41) through the brake spool assembly; the pressure oil introduced by the oil port B (42) can be directly supplied to the oil port BB (44), and the oil outlet oil of the oil port BB (44) is returned to the oil port B (42) through the brake spool assembly.

9. A brake valve group according to claim 8, characterised in that The brake spool assembly is formed with a pilot chamber at each end, and the two pilot chambers are communicated with the oil port A (41) and the oil port B (42) respectively, the pressure oil introduced by the oil port A (41) or the oil port B (42) enters the corresponding pilot chamber through the throttle hole (11), and the oil in the pilot chamber flows out through the flow hole (12).

10. A brake valve group according to claim 7, characterised in that The valve body (4) is formed with oil port A (41), oil port B (42), oil port AA (43) and oil port BB (44), one of the oil port A (41) and the oil port B (42) is used to introduce pressure oil, and the other is used to return oil, one of the oil port AA (43) and the oil port BB (44) is used to enter oil, and the other is used to exit oil; the oil port A (41) and the oil port AA (43) correspond to oil passage, the oil port B (42) and the oil port BB (44) correspond to oil passage, and the pressure oil introduced by the oil port A (41) can be directly supplied to the oil port AA (43), and the oil outlet oil of the oil port AA (43) is returned to the oil port A (41) through the brake spool assembly; the pressure oil introduced by the oil port B (42) can be directly supplied to the oil port BB (44), and the oil outlet oil of the oil port BB (44) is returned to the oil port B (42) through the brake spool assembly.

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