Reversing mechanism with positioning and overload protection functions

Abstract

The utility model relates to a reversing mechanism with positioning and overload protection functions, and aims to solve the technical problems that an existing reversing mechanism is free of positioning and needs to be operated manually all the time, and potential safety hazards exist due to sudden change of oil pressure, and adopts the technical scheme that a valve core is arranged in a valve hole of a valve body, and a pressure oil channel a is arranged in the middle of the valve core and communicated with an oil port A and an oil port B; the left end of the connecting sleeve is connected with the valve element, the check ring is arranged in the valve hole, the end cover is matched with the check ring, the end cover is fixed to the valve body, a reset cavity is formed in a second step hole outside the connecting sleeve, a spring seat I and a reset spring are arranged at the two ends of the reset cavity, the positioning seat is arranged between the end cover and the connecting sleeve and provided with a positioning groove, and the tail plug is arranged at the right end of the connecting sleeve to form an adjusting cavity. A spring seat III and a spring seat II are arranged in the adjusting cavity, a pressure adjusting spring II is arranged between the spring seat III and the spring seat II, a steel ball seat is arranged on the pressure adjusting spring II in a sleeving mode, a pressure adjusting spring I is arranged between the steel ball seat and the tail plug, a steel ball is located in a radial hole of the connecting sleeve, an inclined face is arranged on the steel ball seat, and the left end of a feedback rod is communicated with a pressure oil channel. The right end is connected with the spring seat III. Positioning can be carried out through the positioning groove and the steel ball, operation is easy, oil ways can be switched in time through bounce of the steel ball when oil pressure suddenly changes, and overload protection is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydraulic valve technical field, concretely relates to a reversing mechanism with positioning and overload protection. BACKGROUND

[0002] In the hydraulic system of walking equipment, the single action or composite action of the executing mechanism is usually controlled by the manual multi-way reversing valve, and the structure of the multi-way reversing valve should be simple, compact and safe. For example, when the manual operating equipment is running, the operator usually pushes the valve core through the reversing handle to switch the oil circuit and control the action of the executing mechanism.

[0003] The current common manual multi-way reversing valve has the following deficiencies:

[0004] 1. When the executing mechanism needs to stay in the working position for a long time, the operator needs to push the valve core to keep the valve core in the required reversing position to realize the oil flow to the working cavity.

[0005] 2. When the executing mechanism is working, the pressure suddenly rises abnormally, and the oil circuit cannot be switched in time to reduce the damage of abnormal phenomena to the equipment or personnel. INVENTION CONTENTS

[0006] The utility model aims at solving the above problems and provides a reversing mechanism with positioning and overload protection.

[0007] To solve the above technical problems, the utility model adopts the technical scheme that:

[0008] A reversing mechanism with positioning and overload protection, comprising a valve body, a valve core, a check ring, a return spring, an end cover, a plurality of steel balls, a connecting sleeve, a tail plug, a pressure regulating spring I, a pressure regulating spring II, a steel ball seat, a positioning seat, a feedback rod and a guide sleeve.

[0009] The valve body is provided with a valve hole in the middle, the valve core and the valve hole are gap fitted to form a slide valve pair, the right end of the valve core is provided with a valve core first step hole, a valve core second step hole and a valve core third step hole from right to left, the valve core is axially provided with a pressure oil channel a, the left side of the pressure oil channel a is vertically provided with a channel b and a channel c, the channel b and the channel c are respectively connected with an oil port A and an oil port B, the right end of the valve core is connected with the valve core third step hole, the guide sleeve is arranged in the valve core second step hole, the left end of the connecting sleeve is connected with the valve core second step hole through threads, the retainer ring is annular in size and is provided with a step structure, the small diameter is inserted into the right end gap of the valve hole of the valve body, and the large diameter step surface is tightly attached to the side wall of the valve body, the end cover first step hole in the left end of the end cover is matched with the large diameter of the retainer ring, and the outer side of the end cover is fixed on the valve body through screws, the inner side wall of the end cover is provided with a boss in the middle, the boss is gap fitted with the middle part of the outer side wall of the connecting sleeve, the left side of the boss is an end cover second step hole, the second step hole outside the connecting sleeve is a reset cavity, the reset cavity is provided with spring seats I at both ends, and the two spring seats I are respectively buckled on the right end surface of the valve core and the shoulder of the connecting sleeve, and the both ends of the reset spring are respectively sleeved on the two spring seats I.

[0010] The positioning seat is arranged between the end cover and the connecting sleeve on the right side of the boss, the limiting seat is threadedly connected with the right end of the end cover, a plurality of ball socket-shaped positioning grooves are uniformly arranged at the same circumference of the positioning seat, the number of the positioning grooves in the axial direction is the same as the number of the reversing stations of the valve core, the tail plug is arranged at the right end of the connecting sleeve through threads, the inner side of the right side of the connecting sleeve and the tail plug jointly form an adjusting cavity, the left end of the adjusting cavity is provided with a spring seat III, and the right end is provided with a spring seat II, the pressure regulating spring II is arranged between the spring seat III and the spring seat II, the steel ball seat is sleeved on the pressure regulating spring II, the pressure regulating spring I is arranged between the steel ball seat and the tail plug, a plurality of radial holes are uniformly arranged on the side wall of the connecting sleeve at the same circumference in the adjusting cavity, the plurality of steel balls are located in the radial holes, the outer side wall of the steel ball seat is step-shaped, an inclined surface is arranged between a first step and a second step, and the included angle between the first step and the inclined surface is obtuse, the feedback rod is horizontally arranged in the valve core, the guide sleeve and the connecting sleeve, the left end of the feedback rod is communicated with the pressure oil channel, and the right end is connected with the spring seat III.

[0011] Further, the tail plug is provided with an adjusting screw in the middle, the left end of the adjusting screw is connected with the spring seat II, and a nut is arranged on the adjusting screw of the right end surface of the tail plug.

[0012] Further, the right end outer side wall of the end cover is provided with a dust cover through threads.

[0013] Further, the valve body, the valve core and the retainer ring are provided with a sealing element I, the outer side wall of the guide sleeve in contact with the valve core is provided with a sealing element II, and the guide sleeve in contact with the feedback rod and the valve core is provided with a sealing element III.

[0014] Further, the positioning groove on the positioning seat has a spherical area less than half of the steel ball area, and the vertical height of the inclined surface is less than the diameter of the steel ball.

[0015] Compared with the prior art, the utility model has the advantages that:

[0016] 1、The positioning groove can be positioned after the switching mechanism is switched to the working position, the valve core does not need to be pushed all the time, and the oil passage switching can be easily completed by pushing or pulling at the beginning, so that the operation is simple and the operation intensity is reduced.

[0017] 2、When abnormal working conditions such as pressure sudden rise occur during use, the steel ball bounce can be used to realize timely switching and pressure relief of the oil passage, realize overload protection of the device, and the operation safety performance is high.

[0018] 3、The spring precompression force and the steel ball bounce force can be adjusted in real time through the adjusting screw, so that the operation environment is better adapted.

[0019] 4、The safety factor requirement is high, and the structure is compact. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a sectional view structure schematic diagram of the utility model;

[0021] Figure 2 It is a valve core sectional view local structure schematic diagram of the utility model;

[0022] Figure 3 It is an end cover sectional view structure schematic diagram of the utility model;

[0023] Figure 4 It is a connecting sleeve sectional view structure schematic diagram of the utility model;

[0024] Figure 5 It is a steel ball seat sectional view structure schematic diagram of the utility model;

[0025] Figure 6 It is an end cover connection external structure schematic diagram of the utility model;

[0026] In the drawing: 1, valve body; 2, valve core; 3, check ring; 4, reset spring; 5, spring seat I; 6, end cover; 7, steel ball; 8, connecting sleeve; 9, limiting seat; 10, nut; 11, dust cover; 12, adjusting screw; 13, tail plug; 14, spring seat II; 15, pressure regulating spring I; 16, pressure regulating spring II; 17, steel ball seat; 18, positioning seat; 19, spring seat III; 20, feedback rod; 21, guide sleeve; 22, sealing element I; 23, sealing element II; 24, sealing element III; 25, screw;

[0027] 2.1, valve core first step hole; 2.2, valve core second step hole; 2.3, valve core third step hole;

[0028] 6.1, end cover first step hole; 6.2, end cover second step hole; 6.3, boss;

[0029] 8.1, adjusting cavity; 8.2, radial hole;

[0030] 17.1, first step; 17.2, inclined surface; 17.3, second step. DETAILED DESCRIPTION

[0031] The utility model will be further explained in connection with the drawings and examples.

[0032] As Figures 1-6 shown, a reversing mechanism with positioning and overload protection, including valve body 1, valve core 2, check ring 3, reset spring 4, end cover 6, four steel balls 7, connecting sleeve 8, tail plug 13, pressure regulating spring I 15, pressure regulating spring II 16, steel ball seat 17, positioning seat 18, feedback rod 20 and guide sleeve 21;

[0033] The valve body 1 is provided with a valve hole in the middle, the valve core 2 and the valve hole are gap matched to form a slide valve pair, the right end of the valve core 2 is provided with a valve core first step hole 2.1, a valve core second step hole 2.2 and a valve core third step hole 2.3 from right to left in turn, the valve core 2 is axially provided with a pressure oil channel a, the left side of the pressure oil channel a is vertically provided with a channel b and a channel c, the channel b and the channel c are communicated with an oil port A and an oil port B respectively, the right end of the valve core 2 is communicated with the valve core third step hole 2.3, the guide sleeve 21 is installed in the valve core second step hole 2.2, the left end of the connecting sleeve 8 is connected with the valve core second step hole 2.2 through threads, when the valve core 2 moves left or right, the connecting sleeve 8 and the parts assembled in the connecting sleeve 8 move synchronously, the stop ring 3 is annular size step structure, the small diameter is inserted into the valve hole right end gap of the valve body 1, the large diameter step surface is tightly attached to the side wall of the valve body 1, the end cover first step hole 6.1 of the left end of the end cover 6 is matched with the large diameter of the stop ring 3, the sealing element I 22 is arranged between the valve body 1, the valve core 2 and the stop ring 3, the sealing element II 23 is arranged on the outer side wall of the guide sleeve 21 in contact with the valve core 2, the sealing element III 24 is arranged at the guide sleeve 21 in contact with the feedback rod 20 and the valve core 2, which can not only block the pressure oil of the oil port A or the oil port B from entering the reset cavity of the end cover 6, but also make the feedback rod move flexibly, the outer side of the end cover 6 is fixed on the valve body 1 through the screw 25, the inner side wall of the end cover 6 is provided with a boss 6.3 in the middle, the boss 6.3 is gap matched with the middle part of the outer side wall of the connecting sleeve 8, the left side of the boss 6.3 is the end cover second step hole 6.2, the second step hole 6.2 outside the connecting sleeve 8 is the reset cavity, the reset cavity is provided with spring seats I 5 at both ends respectively, the two spring seats I 5 are buckled on the right end surface of the valve core 2 and the shoulder of the connecting sleeve 8 respectively, the reset spring 4 is sleeved on the two spring seats I 5 at both ends respectively, the two spring seats I 5 are used to limit the precompression amount of the reset spring 4;

[0034] The positioning seat 18 is arranged between the end cover 6 on the right side of the boss 6.3 and the connecting sleeve 8, the limiting seat 9 is threadedly connected with the right end of the end cover 6, the right end outer side wall of the end cover 6 is provided with a dust cover 11 through thread connection, a plurality of ball socket-shaped positioning grooves are uniformly arranged at the same circumference of the positioning seat 18, the spherical surface area of the positioning groove is less than one half of the spherical area of the steel ball, the number of the positioning grooves in the axial direction is the same as the number of the reversing stations of the valve core 2, the tail plug 13 is arranged at the right end of the connecting sleeve 8 through thread connection, the right side inner portion of the connecting sleeve 8 and the tail plug 13 jointly form an adjusting cavity 8.1, the left end of the adjusting cavity 8.1 is provided with a spring seat III 19, and the right end is provided with a spring seat II 14, the pressure regulating spring II 16 is arranged between the spring seat III 19 and the spring seat II 14, the steel ball seat 17 is sleeved on the pressure regulating spring II 16, the pressure regulating spring I 15 is arranged between the steel ball seat 17 and the tail plug 13, a plurality of radial holes 8.2 are uniformly arranged on the side wall of the connecting sleeve 8 at the same circumference in the adjusting cavity 8.1, the plurality of steel balls 7 are located in the radial holes 8.2, the outer side wall of the steel ball seat 17 is in a stepped shape, the first step 17.1 and the second step 17.3 are connected through a slope 17.2, the included angle between the first step 17.1 and the slope 17.2 is obtuse, and the vertical height of the slope 17.2 is less than the diameter of the steel ball 7, the middle of the tail plug 13 is horizontally provided with an adjusting screw 12, the left end of the adjusting screw 12 is connected with the spring seat II 14, the adjusting screw 12 on the right end face of the tail plug 13 is provided with a nut 10, the pre-compression amount of the pressure regulating spring II 16 is adjusted through the adjusting screw 12, so that the rebound pressure is changed, the feedback rod 20 is horizontally arranged in the valve core 2, the guide sleeve 21 and the connecting sleeve 8, the left end of the feedback rod 20 is communicated with the pressure oil channel a, and is used for sensing the pressure of the oil port A or the oil port B, and the right end is connected with the spring seat III 19.

[0035] The working process of the utility model:

[0036] Before use, first of all, rotate the adjusting screw 12, adjust the pre-compression force of the pressure regulating spring II 16, set the rebound pressure of the steel ball 7;

[0037] When the valve core 2 is located at the left side working position, the steel ball 7 moves to the positioning groove on the left side of the positioning seat 18 synchronously with the valve core 2, the reset spring 4 is in a compressed state, the channel b is communicated with the oil port A, the channel c is communicated with the oil port B, when the hydraulic oil is injected into the oil port A, the pressure oil of the oil port A enters the pressure oil channel a through the channel b, and acts on the left end face of the feedback rod 20, the feedback rod 20 real-time feedback pressure of the oil port A;

[0038] When the pressure of oil port A suddenly rises, the pressure oil pushes feedback rod 20 to move rightward, counteracts the preset compression force of pressure regulating spring II 16, pushes spring seat III 19 to move rightward, the right end surface of spring seat III 19 contacts the left end surface of steel ball seat 17 until they move rightward together, so that inclined surface 17.2 is separated from steel ball 7, steel ball 7 loses support and falls to first step 17.1 under the action of gravity, and then is separated from the positioning groove, and then under the action of the pulling force of return spring 4, connecting sleeve 8 moves rightward to reset to the middle position of the two positioning grooves, i.e. Figure 1 The working position shown realizes overload protection of the device.

[0039] When the valve core 2 is manually pushed to move rightward, connecting sleeve 8 is driven to move rightward, and steel ball 7 moves rightward in radial hole 8.2 together with connecting sleeve 8, when the valve core 2 moves to the right working position, passage b is communicated with oil port B, steel ball 7 moves to the right positioning groove, at this time, inclined surface 17.2 contacts the bottom surface of steel ball 7 and generates an upward force on it, steel ball 7 rises into the right positioning groove, and the switching of the oil circuit is realized.

[0040] When the oil pressure of oil port B suddenly rises, the pressure oil pushes feedback rod 20 to move rightward, counteracts the preset compression force of pressure regulating spring II 16, pushes spring seat III 19 to move rightward, the right end surface of spring seat III 19 contacts the left end surface of steel ball seat 17 until they move rightward together, so that inclined surface 17.2 is separated from steel ball 7, steel ball 7 loses support and falls to first step 17.1 under the action of gravity, and then is separated from the positioning groove, and then under the action of the pulling force of return spring 4, valve core 2 moves leftward to reset to the middle position of the two positioning grooves, i.e. Figure 1 The working position shown realizes overload protection of the device.

[0041] When the valve core 2 is manually pushed to move rightward, connecting sleeve 8 is driven to move rightward, and steel ball 7 moves rightward in radial hole 8.2 together with connecting sleeve 8, when the valve core 2 moves to the right working position, passage b is communicated with oil port B, steel ball 7 moves to the right positioning groove, at this time, inclined surface 17.2 contacts the bottom surface of steel ball 7 and generates an upward force on it, steel ball 7 rises into the right positioning groove, and the switching of the oil circuit is realized.

[0042] The dust cover 11 can keep the device clean during use and prolong the service life.

Claims

1. A commutating mechanism with band positioning and overload protection, characterized in that, It includes valve body (1), valve core (2), check ring (3), reset spring (4), end cover (6), several steel balls (7), connecting sleeve (8), tail plug (13), pressure regulating spring I (15), pressure regulating spring II (16), steel ball seat (17), positioning seat (18), feedback rod (20) and guide sleeve (21); The valve body (1) is provided with a valve hole in the middle, the valve core (2) and the valve hole gap cooperate to form a slide valve pair, the right end of the valve core (2) is provided with a valve core first step hole (2.1), a valve core second step hole (2.2) and a valve core third step hole (2.3) from right to left in sequence, the valve core (2) is axially provided with a pressure oil channel a in the middle, the left side of the pressure oil channel a is vertically provided with a channel a and a channel b, the channel a and the channel b are communicated with oil port A and oil port B respectively, the right end of the valve core (2) is communicated with the valve core third step hole (2.3), the guide sleeve (21) is installed in the valve core second step hole (2.2), the left end of the connecting sleeve (8) is connected with the valve core second step hole (2.2) through threads, the check ring (3) is annular size step structure, the small diameter is inserted into the right end gap of the valve hole of the valve body (1), and the large diameter step surface is tightly attached to the side wall of the valve body (1), the end cover first step hole (6.1) of the left end of the end cover (6) is matched with the large diameter of the check ring (3), the outer side of the end cover (6) is fixed on the valve body (1) through screws (25), the inner side wall of the middle of the end cover (6) is provided with a boss (6.3), the boss (6.3) is gap matched with the middle part of the outer side wall of the connecting sleeve (8), the left side of the boss (6.3) is the end cover second step hole (6.2), the second step hole (6.2) outside the connecting sleeve (8) is the reset cavity, the reset cavity is respectively provided with spring seat I (5) at the left and right ends, two spring seat I (5) are respectively buckled on the right end surface of the valve core (2) and the shoulder of the connecting sleeve (8), and the reset spring (4) is sleeved on the two spring seat I (5) at both ends respectively; The positioning seat (18) is arranged between the end cover (6) right side of the boss (6.3) and the connecting sleeve (8), the limiting seat (9) is threadedly connected with the right end of the end cover (6), a plurality of ball socket-shaped positioning grooves are uniformly arranged at the same circumference of the positioning seat (18), the number of the positioning grooves in the axial direction is the same as the number of the reversing stations of the valve core (2), the tail plug (13) is arranged at the right end of the connecting sleeve (8) through thread connection, the right side interior of the connecting sleeve (8) and the tail plug (13) jointly form the adjusting cavity (8.1), the left end of the adjusting cavity (8.1) is provided with the spring seat III (19), and the right end is provided with the spring seat II (14), the pressure regulating spring II (16) is arranged between the spring seat III (19) and the spring seat II (14), the steel ball seat (17) is sleeved on the pressure regulating spring II (16), the pressure regulating spring I (15) is arranged between the steel ball seat (17) and the tail plug (13), a plurality of radial holes (8.2) are uniformly arranged on the sidewall of the connecting sleeve (8) at the same circumference in the adjusting cavity (8.1), the plurality of steel balls (7) are located in the radial holes (8.2), the outer sidewall of the steel ball seat (17) is in a stepped shape, the first step (17.1) and the second step (17.3) are connected through the inclined surface (17.2), and the included angle between the first step (17.1) and the inclined surface (17.2) is obtuse, the feedback rod (20) is horizontally arranged in the valve core (2), the guide sleeve (21) and the connecting sleeve (8), the left end of the feedback rod (20) is communicated with the pressure oil channel, and the right end is connected with the spring seat III (19).

2. A commutator mechanism with positioning and overload protection according to claim 1, characterized in that, The adjusting screw (12) is arranged in the middle of the tail plug (13), the left end of the adjusting screw (12) is connected with the spring seat II (14), and the nut (10) is arranged on the adjusting screw (12) of the right end surface of the tail plug (13).

3. A commutator mechanism with positioning and overload protection according to claim 1, characterized in that, The dust cover (11) is arranged on the right end outer sidewall of the end cover (6) through thread connection.

4. A commutator mechanism with positioning and overload protection according to claim 1, characterized in that, The sealing element I (22) is arranged between the valve body (1), the valve core (2) and the check ring (3), the sealing element II (23) is arranged on the outer sidewall of the guide sleeve (21) in contact with the valve core (2), and the sealing element III (24) is arranged at the guide sleeve (21) in contact with the feedback rod (20) and the valve core (2).

5. A commutator mechanism with position and overload protection according to claim 1, characterized in that, The spherical surface area of the positioning groove on the positioning seat (18) is less than one half of the spherical area of the steel ball (7), and the vertical height of the inclined surface (17.2) is less than the diameter of the steel ball (7).

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