Automatic reversing hydraulic motor, test bench and control method

Abstract

The invention relates to an automatic reversing hydraulic motor, a test bed and a control method. The automatic reversing hydraulic motor comprises a liquid path inlet, a liquid path outlet, a hydraulic cylinder and a valve group, the liquid path inlet and the liquid path outlet are hydraulically connected with the hydraulic cylinder through the valve group; the valve group comprises an overflow valve, a reversing valve A and a reversing valve B; the liquid path inlet is connected with a reversing valve A through an overflow valve; the reversing valve A and the reversing valve B are respectively connected with a liquid path outlet; the liquid path inlet is connected with the reversing valve B; the reversing valve A is in hydraulic control interconnection connection with the reversing valve B; the device is reasonable in design, compact in structure and convenient to use.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of mechanical equipment hydraulic, automatic reversing hydraulic motor, test bench and control method, more particularly to the axial telescopic type double two-position four-way hydraulic reversing hydraulic motor. BACKGROUND

[0002] The existing hydraulic motor includes a cylinder and a piston, which can reciprocate in the cylinder. When the conventional piston is close to the end of the cylinder, electromagnetic reversing or two power sources are required to supply oil to realize reversing.

[0003] How to achieve fast reversing with low cost and simplified structure has become a technical problem to be solved urgently.

[0004] In addition, the current market devices use double hydraulic source drive, external reversing mechanism, high cost, high risk, not easy to repair and replace, short service life.

[0005] In the process of the present application, the reversing needs After the existing hydraulic system appears blockage failure, it is time-consuming and laborious to check the blockage point, and it is extremely difficult to check in a complex hydraulic system. Especially in integrated module connection, it is very difficult to check, and it cannot be preliminarily judged by vibration or heating like rubber pipe connection.

[0006] How to realize convenient troubleshooting has become a technical problem to be solved urgently.

[0007] The present application mainly solves the problem of oil line overpressure detection and reset in the current modular highly integrated system.

[0008] In order to ensure the reliable operation of the hydraulic motor product, the product needs to be tested before leaving the factory. The existing pressure test is generally manually installed on the product on the operation table, and the pressure test and test run are carried out. Its efficiency is low, or the universality is poor, and the multi-connected motor needs to be disassembled and tested separately. SUMMARY

[0009] The technical problem to be solved by the present application is to provide an automatic reversing hydraulic motor, test bench and control method, which has a double two-position four-way hydraulic reversing mechanism, and only one hydraulic source can be used for automatic reversing of the piston.

[0010] To solve the above problems, the technical solution adopted by the present application is: In order to realize automatic control and simplify the liquid path, an automatic reversing hydraulic motor comprises a liquid path inlet, a liquid path outlet, a hydraulic cylinder and a valve group; The liquid path inlet and the liquid path outlet are hydraulically connected to the hydraulic cylinder through the valve group; The valve group comprises an overflow valve, a reversing valve A and a reversing valve B; The liquid path inlet is connected with the reversing valve A through the overflow valve; The reversing valve A and the reversing valve B are respectively connected with the liquid path outlet; The liquid path inlet is connected with the reversing valve B; The reversing valve A and the reversing valve B are connected with each other through liquid control.

[0011] As a further improvement of the above technical solution: In order to realize automatic reversing, the reversing valve A and the reversing valve B are two-position four-way reversing valves; the corresponding oil port of the reversing valve A and the corresponding liquid control port of the reversing valve B are respectively connected; The corresponding oil port of the reversing valve B and the corresponding liquid control port of the reversing valve A are respectively connected.

[0012] In order to realize providing back pressure, the overflow valve has an overflow valve core; the overflow valve core is an automatic reset valve core, which adopts spring reset and / or electromagnetic reset.

[0013] In order to realize throttling, the main liquid inlet cavity A and / or the main oil return B are provided with a throttle valve.

[0014] In order to realize automatic control, the liquid path inlet is connected with the main liquid inlet cavity A; The liquid path outlet is connected with the main oil return B; The main liquid inlet cavity A is divided into two paths, which are respectively connected with the overflow valve and the second input cavity N; The second input cavity N is connected with an inlet of the reversing valve B; The outlet of the overflow valve is connected with an inlet of the reversing valve A through the overflow cavity B; The reversing valve A has a first intermediate cavity U and a first intermediate cavity C which are selectively connected with the overflow cavity B; the first intermediate cavity U and the first intermediate cavity C are respectively located on both sides of the piston of the reversing valve A; There is a first liquid control cavity E at the side end of the first intermediate cavity U, and a first liquid control cavity Q at the side end of the first intermediate cavity C; The reversing valve B has a second intermediate cavity V and a second intermediate cavity W which are separately provided by the piston; There is a second liquid control cavity T at the side end of the second intermediate cavity V, and a second liquid control cavity S at the side end of the second intermediate cavity W; The first intermediate cavity C is connected with the second liquid control cavity T through a valve connection cavity F; The first intermediate cavity U is connected with the second liquid control cavity S through a valve connection cavity K; The first liquid control cavity E is connected with the rodless cavity of the hydraulic cylinder and the second intermediate cavity V through a first execution oil way respectively; The first liquid control cavity Q is connected with the rod cavity P of the hydraulic cylinder and the second intermediate cavity W through a second execution oil way respectively.

[0015] The second intermediate cavity V and the second intermediate cavity W of the reversing valve B are selectively communicated with the second input cavity N.

[0016] The second intermediate chamber V and the second intermediate chamber W of the reversing valve B are connected to the main return oil passage B through the second output chamber R.

[0017] The first intermediate chamber U and the first intermediate chamber C of the reversing valve A are connected to the main return oil passage B through the first output chamber L.

[0018] The piston part is arranged between the rodless chamber and the rod chamber P.

[0019] In order to realize the identification pressure fault point, a pressure indication part comprises a joint body; A top joint is detachably connected to the joint body; The joint body and the top joint through hole are through arranged; An indication rod is lifted in the through hole; An upward clamping part is arranged in the through hole, which is used for preventing the indication rod from automatically falling after rising; The indication rod is elastically connected with the joint body or the top joint.

[0020] As a further improvement of the above technical solution: In order to realize the indication rod limiting, guiding and having flexibility, the indication rod comprises an indication rod upper body and an indication rod lower body which are arranged in sequence; The indication rod upper body lower end has a stepped shaft shoulder; The indication rod lower body enters the through hole of the joint body; The indication rod upper body enters the through hole of the top joint.

[0021] In order to realize reasonable sealing, a bottom lower opening, a middle necking part and an upper opening cavity are sequentially arranged from bottom to top at the through hole of the joint body; The bottom lower opening is a stepped through hole; a sealing gasket body and a sealing ring body are arranged at the small hole of the bottom lower opening, and a sealing plug is arranged at the large hole of the bottom lower opening; The sealing plug is screwed at the large hole and extrudes the sealing ring body with the sealing gasket body.

[0022] In order to facilitate clamping, the top of the indication rod is increased in elasticity, and a lower inner cavity part, an upper clamping part and an upper stop part A are arranged in sequence from bottom to top at the through hole of the top joint; The lower part of the top joint is a threaded connector and is connected with the upper opening cavity inner side wall of the joint body.

[0023] A reset spring is arranged in the lower inner cavity part; The reset spring is sleeved with the indication rod upper body and the lower end of the reset spring is arranged on the stepped shaft shoulder; The indication rod upper body passes through the upper clamping part to the upper stop part A.

[0024] In order to realize the clamping of the indicating rod and the reset of external force, the ascending clamping part is provided with a radial slot obliquely arranged at the upper stop part A of the top joint; A spring retainer and a hole retainer are arranged at the port step hole of the upper stop part A; The hole retainer is used to block the spring retainer; A limit tab is obliquely arranged in the radial slot; The limit tab has a hole groove part; One end of the limit tab is arranged on the end surface of the radial slot, A safety threshold belt is arranged on the upper part of the indicating rod body; A limit spring is arranged between the limit tab and the spring retainer; The hole groove part is sleeved on the indicating rod body.

[0025] The limit spring is sleeved on the indicating rod body.

[0026] The bottom of the radial slot has a high end B point; The inner end of the limit tab is arranged at the high end B point; The outer end of the limit tab is exposed from the radial slot; The end of the radial slot has a bending.

[0027] In the natural state, the safety threshold belt is located below the hole groove part; The lowest point A of the hole groove part is in pressure contact with the outer wall of the indicating rod body.

[0028] When the indicating rod goes up, the safety threshold belt goes up, and the lowest point A is in pressure contact with the hole groove part; The force of the limit tab clamping the safety threshold belt is greater than the downward force of the indicating rod, preventing the reset of the indicating rod.

[0029] As a further improvement of the above technical solution: An automatic reversing hydraulic motor, The upper end of the overflow valve is connected with a pressure indicating part; The pressure indicating part includes a joint body for connecting with the overflow valve; The overflow valve has an overflow valve core; A top joint is detachably connected on the joint body; The joint body and the through hole of the top joint are throughly arranged; An indicating rod is lifted in the through hole; An ascending clamping part is arranged in the through hole to prevent the automatic falling of the indicating rod after ascending; The indicating rod is elastically connected with the joint body or the top joint; The upper end of the overflow valve core is connected, spaced or abutted with the lower end of the indicating rod.

[0030] As a further improvement of the above technical solution: The indicating rod comprises an indicating rod upper body and an indicating rod lower body connected in sequence from top to bottom, and the indicating rod lower body is connected with the upper end of the overflow valve core; The lower end of the indicating rod upper body has a stepped shaft shoulder; The indicating rod lower body enters the through hole of the joint body; The indicating rod upper body enters the through hole of the top joint;

[0031] A throttle valve is arranged on the main liquid inlet cavity A and / or the main oil return path B; From bottom to top, the through hole of the joint body is sequentially provided with a bottom lower opening, a middle necked opening part and an upper opening cavity; The bottom lower opening is a stepped through hole; a sealing gasket body and a sealing ring body are arranged at the small hole of the bottom lower opening, and a sealing plug is arranged at the large hole of the bottom lower opening; The sealing plug is screwed at the large hole and extrudes the sealing ring body with the sealing gasket body; The through hole of the top joint is sequentially provided with a lower inner cavity part, an upper clamping part and an upper stop part A from bottom to top; The lower part of the top joint is a threaded joint, which is connected with the inner threaded sidewall of the upper opening cavity of the joint body; A return spring is arranged in the lower inner cavity part; The return spring is sleeved with the indicating rod upper body, and the lower end of the return spring is arranged on the stepped shaft shoulder; The indicating rod upper body passes through the upper clamping part to the upper stop part A; The upper clamping part comprises a radial slot arranged obliquely on the upper stop part A of the top joint; A spring stop ring and a hole stop ring are arranged at the stepped hole of the port of the upper stop part A; The hole stop ring is used to block the spring stop ring; A limit lever is arranged obliquely in the radial slot; The limit lever has a hole slot part; One end of the limit lever is arranged on the inclined surface of the end part of the radial slot, A safety threshold belt is arranged on the upper part of the indicating rod upper body; A limit spring is arranged between the limit lever and the spring stop ring; The hole slot part is sleeved on the indicating rod upper body; The limit spring is sleeved on the indicating rod upper body; The bottom of the radial slot has a high end B point; The inner end of the limit lever is arranged at the high end B point; The outer end of the limit lever is exposed from the radial slot; The end of the radial slot has a bend; In a natural state, the safety threshold belt is located below the hole slot part; The lowest point A of the hole slot part is in pressure contact with the outer sidewall of the indicating rod upper body; When the indicating rod goes up, the safety threshold band goes up, and the lowest point A is in pressure contact with the hole groove part; The force of the limit push piece clamping the safety threshold band is greater than the indicating rod descending force, preventing the indicating rod from resetting; The safety threshold band is greater than the working pressure of the overflow valve.

[0032] A test bench of an automatic reversing hydraulic motor for testing the hydraulic motor; the hydraulic motor comprises a motor body; a lifting ring part is arranged on the motor body; The test bench comprises a test bench body; A stroke assembly, a connecting pipe assembly and a lifting ring adjusting hand are arranged on the test bench body respectively; A plurality of positioning bases of different specifications are arranged on the test bench body; A bottom hole is arranged on the positioning base; An elastic alignment head is arranged on the test bench body; A matching process groove is arranged on the motor body; The stroke assembly comprises a vertically arranged stroke spring rod part; a pressure sensor is arranged on the cantilever end of the stroke spring rod part; the pressure sensor is used for abutting against the descending piston part; The connecting pipe assembly comprises a hydraulic connector moving assembly on the test bench body; the hydraulic connector moving assembly at least has lifting and horizontal moving actions; A butt joint connector is arranged on the hydraulic connector moving assembly, which is used for connecting the liquid inlet of the motor body and the outlet of the hydraulic source respectively; The lifting ring adjusting hand comprises a linear driving hand A and a linear driving hand B arranged oppositely on the test bench body; An oblique pushing hand is arranged at the end of the linear driving hand A and the linear driving hand B respectively; A reset pushing hand part is arranged on the test bench body; The reset pushing hand part has lifting and horizontal moving actions; The linear driving hand A and the linear driving hand B are arranged in parallel and the distance between them is greater than the thickness of the lifting ring part and less than 1 / 2 of the outer diameter of the lifting ring part; The reset pushing hand part is used for pushing the limit push piece; When testing, first, the matching positioning base is installed on the test bench body; then, the motor body is installed on the positioning base, and after the elastic alignment head is aligned, it is fixed by descending; secondly, the butt joint connector is aligned with the liquid inlet and the outlet of the hydraulic source respectively by moving the hydraulic connector moving assembly, and the rotating connection or insertion is performed by manual or mechanical hand, and the pressure sensor abuts against the descending piston part; The pump station is started, the hydraulic motor control method is executed, and the test is performed; First, the constant pressure test is started; Then, the safety limit test is carried out, when the set safety pressure is reached, the overflow valve core drives the indicating rod to rise; the safety threshold reaches the limit of the tab and is clamped; through the lifting stroke of the stroke spring rod and the pressure sensor, the stroke distance of the piston part is detected; Then, the reset pusher part drives the limit tab to change from an inclined state to a horizontal state, and the limit spring is separated from the safety threshold; Next, through the gear and rack mechanism, the straight line driving hand A and the straight line driving hand B are driven to move towards each other, and the inclined pusher rotates the hanging ring part in the opposite direction along the spiral direction; Further, the motor body is loosened, the hook is hooked to the hanging ring part, the elastic alignment top head is lifted to the motor body, so that the motor body is lifted and transported away.

[0033] The motor is driven by a single hydraulic source, automatically changes direction, provides stable power, has a longer stroke, and is more flexible. It is more suitable for use in specific working conditions, such as the use of various fluid conveying equipment; and solves the problem of difficulty in replacement and maintenance on the market at present.

[0034] The present application provides a kind of for replaceable, economic, efficient, durable hydraulic motor and with double two-position four-way hydraulic direction changing mechanism;It is rationally designed, low in cost, solid and durable, safe and reliable, easy to operate, time-saving and labor-saving, saves funds, compact structure and convenient to use, single hydraulic source drive, automatic direction changing, high integration, long stroke, easy to disassemble and maintain.

[0035] The present application can effectively detect the overpressure problem of the hydraulic oil circuit under different pressures, and can be reset manually, greatly saving labor cost and improving maintenance efficiency.

[0036] The present application can quickly lock the fault point, improve the maintenance efficiency and save the labor cost.

[0037] The present application can realize overflow indication self-locking, and can be externally controlled (such as manually or by a mechanical arm) to reset the structure, so as to facilitate locking the problem channel;Its self-locking and resetting integrated design has high integration.

[0038] The present application adopts overflow valve installation pressure indication part, which can realize pressure value monitoring, and can realize fault monitoring when the pressure is too high. When abutting or connecting, real-time dynamic monitoring can be realized. When interval setting is adopted, only when the hydraulic pressure reaches the safety pressure value, the valve core overcomes the spring force and is exposed longer, and the indication part is lifted to realize pipeline fault indication.

[0039] The present application is matched with a test bench to improve the test automation efficiency. The present application realizes the installation and positioning requirements of different specifications of motors through the positioning base. The present application is convenient to hoist through the hanging ring part, realizes the stroke detection of the piston rod through the stroke assembly, and realizes the pipeline regulation of the test bench rubber pipe through the connector assembly.

[0040] As a further improvement, it adopts the ring adjustment hand to realize the direction adjustment of the lifting ring part, facilitates the subsequent hooking, facilitates the separation of the motor from the base through the elastic alignment top head, realizes the monitoring through the scale or grating on the stroke spring rod part, realizes the load set value through the pressure sensor, the hydraulic joint moving assembly is at least two shaft actions, the docking joint can be a threaded head or other matched rubber pipe, the invention drives the oblique push hand to move through the linear drive hand A and the linear drive hand B to realize the direction adjustment of the lifting ring, thereby facilitating the subsequent lifting, and the limit push piece is returned through the reset push hand part controlled by the mechanical arm or manual operation. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 The liquid path entrance using structure schematic diagram of the present application.

[0042] Figure 2 The liquid path outlet structure schematic diagram of the present application.

[0043] Figure 3 The hydraulic principle schematic diagram of the present application.

[0044] Figure 4 The improved hydraulic principle schematic diagram of the present application.

[0045] Figure 5 The pressure indication part appearance structure schematic diagram of the present application.

[0046] Figure 6 The pressure indication part internal structure schematic diagram of the present application.

[0047] Figure 7 The test bench structure schematic diagram of the present application.

[0048] Figure 8 The test bench three-dimensional structure schematic diagram of the present application.

[0049] Figure 9 The hydraulic principle variable direction structure schematic diagram of the present application.

[0050] Wherein: 1, liquid inlet; 2, liquid outlet; 3, throttle valve; 4, main liquid inlet cavity A; 5, overflow valve; 6, overflow valve core; 7, overflow cavity B; 8, valve connection cavity F; 9, first hydraulic control cavity E; 10, hydraulic cylinder; 11, rodless cavity; 12, piston part; 13, reversing valve A; 14, second execution oil way; 15, valve connection cavity K; 16, reversing valve B; 17, first output cavity L; 18, first execution oil way; 19, second input cavity N; 20, rod cavity P; 21, first hydraulic control cavity Q; 22, second output cavity R; 23, second hydraulic control cavity S; 24, second hydraulic control cavity T; 25, first intermediate cavity U; 26, second intermediate cavity V; 27, second intermediate cavity W; 28, main oil return way B; 30, pressure indicating part; 31, joint body; 32, sealing ring body; 33, sealing gasket body; 34, sealing plug; 35, top joint; 36, spring retainer; 37, hole retainer; 38, limit push piece; 39, return spring; 40, limit spring; 41, indicating rod upper body; 42, indicating rod lower body; 43, radial slot; 44, safety threshold band; 45, hole and groove part; 46, upper stop opening part A; 47, upper snap opening part; 48, lower inner cavity part; 49, upper opening cavity; 50, bottom lower opening; 51, middle necked part; 52, threaded connector; 60, test bench body; 61, motor body; 62, lifting ring part; 63, stroke assembly; 64, connecting pipe assembly; 65, lifting ring adjusting hand; 66, positioning base; 67, elastic alignment head; 68, stroke spring rod part; 69, pressure sensor; 70, hydraulic connector moving assembly; 71, butt joint connector; 72, linear drive hand A; 73, linear drive hand B; 74, oblique pushing hand; 30, pressure indicating part; 75, reset pushing hand part. DETAILED DESCRIPTION

[0051] As Figures 1-9 shown, the automatic reversing hydraulic motor of the embodiment includes a liquid inlet 1, a liquid outlet 2, a hydraulic cylinder 10, and a valve group; the cavities in the present application can be pipelines, channels, etc., which are all within the protection scope. The connection includes direct connection or indirect connection, and the present application omits the main components such as pressure gauges, safety valves, filter screens, etc.

[0052] The liquid inlet 1 and the liquid outlet 2 are hydraulically connected to the hydraulic cylinder 10 through the valve group; thereby realizing the action of the hydraulic cylinder.

[0053] The valve group includes an overflow valve 5, a reversing valve A 13, and a reversing valve B 16; The liquid inlet 1 is connected to the reversing valve A 13 through the overflow valve 5; The reversing valve A 13 and the reversing valve B 16 are respectively connected to the liquid outlet 2, realizing pressure relief and unloading, thereby realizing the cyclic reciprocating motion and avoiding the residual pressure in the middle way being too high; The liquid inlet 1 is connected to the reversing valve B 16; The reversing valve A13 and the reversing valve B16 are connected by liquid control interconnection, so as to realize mutual action, and realize continuous circulation action by inertia force, back pressure of the overflow valve, and pressure difference between the inlet and the outlet.

[0054] The corresponding oil port of the reversing valve A13 is connected with the corresponding liquid control port of the reversing valve B16 respectively; The corresponding oil port of the reversing valve B16 is connected with the corresponding liquid control port of the reversing valve A13 respectively.

[0055] The overflow valve 5 has an overflow valve core 6; the overflow valve core 6 is an automatic reset valve core, and is reset by a spring and / or an electromagnetic reset.

[0056] The throttle valve 3 is arranged on the main liquid inlet cavity A4 and / or the main oil return B28, so as to realize flow adjustment.

[0057] The liquid path inlet 1 is connected with the main liquid inlet cavity A4; The liquid path outlet 2 is connected with the main oil return B28; the inlet and the outlet can be holes, pipelines or other structures.

[0058] The main liquid inlet cavity A4 is divided into two parts, and is connected with the overflow valve 5 and the second input cavity N19 respectively; direct communication and back pressure driving control are realized.

[0059] The second input cavity N19 is connected with one inlet of the reversing valve B16; the connection can be realized by a hole, a pipeline or other conventional modes.

[0060] The outlet of the overflow valve 5 is connected with one inlet of the reversing valve A13 through the overflow cavity B7; The reversing valve A13 has a first intermediate cavity U25 and a first intermediate cavity C which are selectively connected with the overflow cavity B7; the first intermediate cavity U25 and the first intermediate cavity C are respectively located on two sides of the piston of the reversing valve A13; so as to realize liquid control.

[0061] The first intermediate cavity U25 has a first liquid control cavity E9 at the side end, and the first intermediate cavity C has a first liquid control cavity Q21 at the side end; The reversing valve B16 has a second intermediate cavity V26 and a second intermediate cavity W27 which are arranged by the piston; The second intermediate cavity V26 has a second liquid control cavity T24 at the side end, and the second intermediate cavity W27 has a second liquid control cavity S23 at the side end; The first intermediate cavity C is connected with the second liquid control cavity T24 through the valve connection cavity F8; The first intermediate cavity U25 is connected with the second liquid control cavity S23 through the valve connection cavity K15; The first liquid control cavity E9 is connected with the rodless cavity 11 of the hydraulic cylinder 10 and the second intermediate cavity V26 through the first execution oil path 18 respectively; The first hydraulic control chamber Q21 is connected to the rod chamber P20 of the hydraulic cylinder 10 and the second intermediate chamber W27 through the second execution oil path 14. Of course, as an extension, the rod chamber and the rodless chamber can be replaced.

[0062] The second intermediate chamber V26 of the reversing valve B16 and the second intermediate chamber W27 are alternatively communicated with the second input chamber N19.

[0063] The second intermediate chamber V26 of the reversing valve B16 and the second intermediate chamber W27 are alternatively connected to the main return oil path B28 through the second output chamber R22.

[0064] The first intermediate chamber U25 of the reversing valve A13 and the first intermediate chamber C are alternatively connected to the main return oil path B28 through the first output chamber L17.

[0065] The piston part 12 is arranged between the rodless chamber 11 and the rod chamber P20.

[0066] Process description: Step one, when the hydraulic source enters the throttle valve 3 for flow regulation through the hydraulic path inlet 1, enters the main inlet chamber A4, then enters the second input chamber N19, enters the first execution oil path 18 through the second intermediate chamber V26, and finally enters the first hydraulic control chamber E9 and the rodless chamber 11, at this time the hydraulic oil pushes the reversing valve A13 (two-position four-way reversing valve core one) and the piston part 12 downward to the lowermost end; Step two, as the pressure in the above chamber increases, the overflow valve core 6 is pushed upward, the main inlet chamber A4 and the overflow chamber B7 are connected, the hydraulic oil enters the first intermediate chamber U25, then enters the second hydraulic control chamber S23 through the valve path connecting chamber K15; the reversing valve B16 (two-position four-way reversing valve core two) is pushed upward, at this time the second input chamber N19 and the second intermediate chamber W27, the second execution oil path 14, the rod chamber P20 are connected, the piston part 12 and the reversing valve A13 (two-position four-way reversing valve core one) are pushed upward, the second output chamber R22 and the second intermediate chamber V26, the valve path connecting chamber F8, the rodless chamber 11, the hydraulic source outlet 2 are connected, and the reversing is completed. Continue to supply oil, repeat the above cycle, realize the up and down action of the piston part 12, and the working principle of the new type automatic reversing hydraulic motor; Process description: As Figure 1 , the hydraulic path inlet 1 is arranged on one side of the throttle valve 3, the main inlet chamber A4 is connected to the throttle valve 3 and the overflow valve 5, and the overflow valve 5 is provided with an overflow valve core 6; As Figure 2When the reversing valve A13 and the reversing valve B16 are lowered, the main inlet chamber A4, the second input chamber N19, the first execution oil way 18, the first hydraulic control chamber E9, the rodless chamber 11 are communicated with each other; the overflow chamber B7, the chamber 25, the valve way connecting chamber K15 are communicated with each other; the hydraulic source outlet 2, the main return oil way B28, the second output chamber R22, the chamber 17, the first intermediate chamber U25, the valve way connecting chamber F8, the second hydraulic control chamber T24, the second execution oil way 14, the rod chamber P20 are communicated with each other; As Figure 3 When the reversing valve A13 and the reversing valve B16 are lowered, the main inlet chamber A4, the second input chamber N19, the first hydraulic control chamber Q21, the second intermediate chamber W27, the second execution oil way 14, the rod chamber P20 are communicated with each other; the valve way connecting chamber F8, the overflow chamber B7, the second hydraulic control chamber T24 are communicated with each other; the rodless chamber 11, the first execution oil way 18, the first hydraulic control chamber E9, the second output chamber R22, the second intermediate chamber V26, the first output chamber L17, the first intermediate chamber U25, the second hydraulic control chamber S23, the valve way connecting chamber K15, the hydraulic source outlet 2 are communicated with each other.

[0067] The ingenious part of the present application is that the overflow chamber B7 exists in the pressure higher than the outlet pressure, thereby reducing the starting pressure when the valve core is reversed, realizing the quick starting response and reducing the response time.

[0068] As Figures 1-3 The pressure indicating part of the embodiment comprises a joint body 31; it is used for connecting the main body and feeding back the pressure value change of the main body part.

[0069] The top joint 35 is detachably connected on the joint body 31; the split connection is adopted, so that the internal spring is installed and the maintenance is facilitated.

[0070] The joint body 31 and the top joint 35 are provided with through holes; the through holes are used as the through channels of the indicating rod; The indicating rod is lifted in the through hole and is used for pressure indication; the scale line, the grating or the travel switch can be arranged, so that the automatic feedback is realized.

[0071] The rising clamping part is arranged in the through hole and is used for preventing the indicating rod after rising from automatically falling; the clamping part can be the elastic steel ball, but the reset is not convenient and the structure is complex.

[0072] The indicating rod is elastically connected with the joint body 31 or the top joint 35, so that the liquid dynamic force is offset and the vibration is reduced, and at the same time, the safety pressure threshold is set through the spring force.

[0073] In order to facilitate the description, the indicating rod comprises an indicating rod upper body 41 and an indicating rod lower body 42 which are arranged in sequence; The lower end of the indicating rod upper body 41 has a stepped shaft shoulder, which realizes limiting and simultaneously realizes the support of the spring; The indicating rod lower body 42 enters the through hole of the joint body 31; the indicating rod upper body 41 enters the through hole of the top joint 35.

[0074] In order to realize the guiding and stable installation of the spring, the bottom lower opening 50, the middle necked opening part 51 and the upper opening cavity 49 are sequentially arranged from bottom to top at the through hole of the joint body 31; The bottom lower opening 50 is a stepped through hole; the sealing gasket body 33 and the sealing ring body 32 are arranged at the small hole of the bottom lower opening 50, and the sealing plug 34 is arranged at the large hole of the bottom lower opening 50; in order to realize sealing, realize the connection of the display spring and other components with the inside of the main body, thereby facilitating the spring force adjustment and maintenance.

[0075] The sealing plug 34 is screwed at the large hole, and the sealing gasket body 33 is extruded to the sealing ring body 32.

[0076] The through hole of the top joint 35 is sequentially provided with the lower inner cavity part 48, the upper clamping part 47 and the upper stop part A46 from bottom to top; The lower part of the top joint 35 is a threaded connector 52, which is connected with the inner side wall of the upper opening cavity 49 of the joint body 31 through threads, thereby realizing the thread connection, and can also be connected through flanges.

[0077] The reset spring 39 is arranged in the lower inner cavity part 48; The reset spring 39 is sleeved with the indicating rod upper body 41, and the lower end of the reset spring 39 is arranged on the stepped shaft shoulder; The indicating rod upper body 41 passes through the upper clamping part 47 to the upper stop part A46.

[0078] As an improvement, in order to facilitate operation and reduce noise, the upward clamping part includes the radial slot 43 which is arranged obliquely at the upper stop part A46 of the top joint 35, thereby facilitating the axial swing thereof; The spring stop ring 36 and the hole stop ring 37 are arranged at the stepped hole of the upper stop part A46; The hole stop ring 37 is used to block the spring stop ring 36; The limit push piece 38 is obliquely arranged in the radial slot 43.

[0079] The limit push piece 38 has a hole slot part 45; One end of the limit push piece 38 is arranged on the inclined surface of the end of the radial slot 43, thereby increasing the inclination angle thereof, thereby facilitating the positioning of the limit push piece 38 by using friction or through a convex part or a groove.

[0080] The safety threshold belt 44 is arranged on the upper part of the indicating rod upper body 41; The limiting spring 40 is arranged between the limiting push piece 38 and the spring stop ring 36, and the spring is used to reset the limiting push piece.

[0081] The hole groove part 45 is sleeved on the indicating rod upper body 41.

[0082] The limiting spring 40 is sleeved on the indicating rod upper body 41.

[0083] The slot bottom of the radial slot 43 has a high end B point; The inner end of the limiting push piece 38 is arranged at the high end B point, so as to serve as a reference point; The outer end head of the limiting push piece 38 is exposed from the radial slot 43; The end head of the radial slot 43 has a bending, so as to facilitate the pressing.

[0084] In the natural state, the safety threshold band 44 is located below the hole groove part 45; The lowest point A of the hole groove part 45 is in pressure contact with the outer side wall of the indicating rod upper body 41.

[0085] When the indicating rod goes up, the safety threshold band 44 goes up, and the lowest point A is in pressure contact with the hole groove part 45; As an extended embodiment, the safety threshold band 44 can be an optical axis, a thread, a ring groove or a shaft shoulder; The force of the limiting push piece 38 clamping the safety threshold band 44 is greater than the downward force of the indicating rod, so as to prevent the indicating rod from resetting.

[0086] The specific process and working process are described as follows: The sealing gasket 33 is arranged inside the joint body 31, the sealing ring 32 is arranged at the bottom of the sealing gasket 33, the sealing plug 34 is arranged to be pressed into the joint body 31, the indicating rod lower body 42 is arranged in the joint body 31, the reset spring 39 is arranged in the bottom hole of the top joint 35, the indicating rod upper body 41 is arranged in the top joint 35, the limiting push piece 38 is arranged at the top of the top joint 35, the limiting spring 40 is arranged inside the top joint 35 and presses the limiting push piece 38, the spring stop ring 36 is arranged in the top joint 35 and presses the upper end of the limiting spring 40, the hole stop ring 37 is arranged in the top joint 35 and fixes the spring stop ring 36, and then the assembled top joint 35 is screwed into the top of the joint 31; When the device is placed in the system, the system pressure rises to the joint setting value, the oil pressure pushes the lower body 42 of the indicating rod to move up; indirectly pushes the upper body 41 of the indicating rod to move up, thereby compressing the reset spring 39; because the limiting tab 38 is on the slope of the top joint 5, the limiting spring 40 is compressed to be subjected to an inclined force, the hole edge of the limiting tab 38 clamps the upper body 41 of the indicating rod, so that it cannot reset; when the system pressure decreases, the upper body 41 of the indicating rod is still at the top, at this time push the limiting tab 38 upward, the upper body 41 of the indicating rod is released from the hole edge of the limiting tab 38, through the force of the reset spring 39, move down to the bottom, at the same time push the lower body of the indicating rod to move down, complete the reset.

[0087] As Figures 1-8 shown, the automatic reversing hydraulic motor of the embodiment, The upper end of the overflow valve 5 is connected with the pressure indicating part 30; The pressure indicating part 30 includes a joint body 31; for connecting with the overflow valve 5; The overflow valve 5 has an overflow valve core 6; The upper end of the overflow valve core 6 is connected with the lower end of the indicating rod, is spaced or abuts.

[0088] The indicating rod includes an upper body 41 and a lower body 42 connected in sequence, and the upper end of the overflow valve core 6 is connected with the lower body 42 of the indicating rod; A throttle valve 3 is arranged on the main inlet cavity A4 and / or the main oil return B28; The test bench of the automatic reversing hydraulic motor of the embodiment is used for testing the pressure of the hydraulic motor; the hydraulic motor includes a motor body 61; a lifting ring part 62 is arranged on the motor body 61; The test bench includes a test bench body 60; A stroke assembly 63, a connecting pipe assembly 64 and a lifting ring adjusting hand 65 are arranged on the test bench body 60 respectively; A plurality of positioning bases 66 of different specifications are arranged on the test bench body 60; A bottom hole is arranged on the positioning base 66; An elastic alignment top head 67 is arranged on the test bench body 60; A matching process groove is arranged on the motor body 61; The stroke assembly 63 includes a vertically arranged stroke spring rod part 68; a pressure sensor 69 is arranged on the cantilever end of the stroke spring rod part 68; the pressure sensor 69 is used for abutting the downward piston part 12; The connecting pipe assembly 64 includes a hydraulic connector moving assembly 70 on the test bench body 60; the hydraulic connector moving assembly 70 at least has lifting and horizontal moving actions; A butt joint connector 71 is arranged on the hydraulic connector moving assembly 70, which is used for connecting the liquid inlet 1 of the motor body 61 and the outlet 2 of the hydraulic source respectively; The lifting ring adjusting hand 65 comprises straight line driving hands A 72 and B 73 oppositely arranged on the test bench body 60; The end of the straight line driving hands A 72 and B 73 is respectively provided with an oblique pushing hand 74; The test bench body 60 is provided with a reset pushing hand part 75; The reset pushing hand part 75 has lifting and horizontal moving actions; The straight line driving hands A 72 and B 73 are arranged in parallel and the distance between them is greater than the thickness of the lifting ring part 62 and less than 1 / 2 of the outer diameter of the lifting ring part 62; The reset pushing hand part 75 is used for lifting and limiting the push piece 38; When the test is carried out, firstly, the matched positioning base 66 is installed on the test bench body 60; then, the motor body 61 is installed on the positioning base 66, and after the elastic positioning head 67 is aligned, it is fixed by descending; secondly, the hydraulic connector moving assembly 70 is moved, so that the connector 71 is respectively aligned with the liquid inlet 1 and the hydraulic source outlet 2, and the pressure sensor 69 is abutted with the descending piston part 12 through manual or mechanical hand rotation connection or insertion; The pump station is started, the hydraulic motor control method is executed, and the test is carried out; Figure 4 The valve core and the indicating rod are abutted, and real-time monitoring can be realized.

[0089] Figure 9 The valve core and the indicating rod are arranged at intervals, and frequent starting can be avoided. Only when the safety pressure is exceeded, the indicating rod can be driven.

[0090] Firstly, the constant pressure test is started; Then, the safety limit test is carried out, when the set safety pressure is reached, the overflow valve core 6 drives the indicating rod to rise; the safety threshold 44 reaches the limit push piece 38 and is clamped; the travel distance of the piston part 12 is detected through the lifting travel of the travel spring rod part 68 and the pressure sensor 69; Then, the reset pushing hand part 75 drives the limit push piece 38 to change from an inclined state to a horizontal state, and the limit spring 40 and the safety threshold 44 are separated; Next, the straight line driving hands A 72 and B 73 are driven to move towards each other through the gear and rack mechanism, and the oblique pushing hand 74 reversely rotates the lifting ring part 62 along the spiral direction; Further, the motor body 61 is loosened, the lifting ring part 62 is hooked, the elastic positioning head 67 lifts the motor body 61, so that the motor body 61 is lifted and transported away.

[0091] The present application is fully described in order to disclose more clearly, and the prior art is not listed one by one.

[0092] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same; although the present application has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some of the technical features can be replaced by equivalents; it is obvious for those skilled in the art to combine the technical solutions of the present application. The essence of the corresponding technical solution does not deviate from the spirit and scope of the technical solutions of the embodiments of the present application. The technical content not described in detail in the present application is known technology.

Claims

1. A liquid motor with automatic commutation, characterized in that: The valve group is connected to the hydraulic cylinder (10) through the liquid inlet (1) and the liquid outlet (2); The valve group comprises an overflow valve (5), a reversing valve A (13) and a reversing valve B (16); The liquid inlet (1) is connected to the reversing valve A (13) through the overflow valve (5); The reversing valve A (13) and the reversing valve B (16) are respectively connected to the liquid outlet (2); The corresponding oil port of the reversing valve A (13) is connected to the corresponding hydraulic control port of the reversing valve B (16); The corresponding oil port of the reversing valve B (16) is connected to the corresponding hydraulic control port of the reversing valve A (13); The upper end of the overflow valve (5) is connected to a pressure indicating part (30); 2. The automatically reversing hydraulic motor of claim 1, wherein: The pressure indicating part (30) comprises a connector body (31) for connecting to the overflow valve (5); The overflow valve (5) has an overflow valve core (6); A top connector (35) is detachably connected to the connector body (31); The connector body (31) and the top connector (35) are through holes; An indicating rod is lifted in the through hole; An upward clamping part is arranged in the through hole to prevent the indicating rod from falling automatically after rising; The indicating rod is elastically connected to the connector body (31) or the top connector (35); The upper end of the overflow valve core (6) is connected to the lower end of the indicating rod. The indicating rod comprises an indicating rod upper body (41) and an indicating rod lower body (42) connected in sequence; The lower end of the indicating rod upper body (41) has a stepped shaft shoulder; The indicating rod lower body (42) enters the through hole of the connector body (31); 3. The hydraulically actuated motor of claim 1 or 2, wherein: The indicating rod upper body (41) enters the through hole of the top connector (35). A throttle valve (3) is arranged on the main liquid inlet cavity A (4) and / or the main oil return path B (28); From bottom to top, a bottom lower opening (50), a middle necked part (51) and an upper opening cavity (49) are arranged in the through hole of the connector body (31) in sequence; The bottom lower opening (50) is a stepped through hole; a sealing gasket body (33) and a sealing ring body (32) are arranged at the small hole of the bottom lower opening (50), and a sealing plug (34) is arranged at the large hole of the bottom lower opening (50); 4. The automatically reversing hydraulic motor of claim 3, wherein: The sealing plug (34) is screwed at the large hole and presses the sealing gasket body (33) and the sealing ring body (32); From bottom to top, a lower inner cavity part (48), an upper clamping part (47) and an upper stop part A (46) are arranged in the through hole of the top connector (35) in sequence; The lower part of the top connector (35) is a threaded connector (52) connected to the inner thread side wall of the upper opening cavity (49) of the connector body (31); A return spring (39) is arranged in the lower inner cavity part (48); The return spring (39) is sleeved on the indicating rod upper body (41), and the lower end of the return spring (39) is arranged on the stepped shaft shoulder; The indicating rod upper body (41) passes through the upper clamping part (47) to the upper stop part A (46) The upward clamping part comprises a radial slot (43) arranged obliquely in the upper stop part A (46) of the top connector (35). ​ ​ ​ Spring retainer (36) and hole retainer (37) are arranged at the port step hole of the upper stopper part A (46); The hole retainer (37) is used to block the spring retainer (36); The limit lever (38) is arranged in the radial slot (43) in an inclined manner; The limit lever (38) has a hole slot part (45); One end of the limit lever (38) is arranged on the inclined surface of the end of the radial slot (43), The safety threshold band (44) is arranged on the upper part of the indicator upper body (41); The limit spring (40) is arranged between the limit lever (38) and the spring retainer (36); The hole slot part (45) is sleeved on the indicator upper body (41); The limit spring (40) is sleeved on the indicator upper body (41); The bottom of the radial slot (43) has a high end B point; The inner end of the limit lever (38) is arranged at the high end B point; The outer end of the limit lever (38) is exposed from the radial slot (43); The end of the radial slot (43) has a bending; In the natural state, the safety threshold band (44) is below the hole slot part (45); The lowest point A of the hole slot part (45) is in pressure contact with the outer side wall of the indicator upper body (41); When the indicator goes up, the safety threshold band (44) goes up, and the lowest point A is in pressure contact with the hole slot part (45); The force of the limit lever (38) clamping the safety threshold band (44) is greater than the downward force of the indicator, preventing the indicator from resetting; The safety threshold band (44) is greater than the working pressure of the overflow valve (5).

5. The automatically reversing hydraulic motor of claim 4, wherein: The liquid path inlet (1) is connected with the main liquid inlet cavity A (4); The liquid path outlet (2) is connected with the main oil return path B (28); The main liquid inlet cavity A (4) is divided into two paths, which are respectively connected with the overflow valve (5) and the second input cavity N (19); The second input cavity N (19) is connected with the one inlet of the reversing valve B (16); The outlet of the overflow valve (5) is connected with the one inlet of the reversing valve A (13) through the overflow cavity B (7); The reversing valve A (13) has the first intermediate cavity U (25) and the first intermediate cavity C connected with the overflow cavity B (7) in an alternative manner; the first intermediate cavity U (25) and the first intermediate cavity C are respectively located on the two sides of the piston of the reversing valve A (13); The first liquid control cavity E (9) is arranged at the side end of the first intermediate cavity U (25), and the first liquid control cavity Q (21) is arranged at the side end of the first intermediate cavity C; The reversing valve B (16) has the second intermediate cavity V (26) and the second intermediate cavity W (27) arranged separately by the piston; The second liquid control cavity T (24) is arranged at the side end of the second intermediate cavity V (26), and the second liquid control cavity S (23) is arranged at the side end of the second intermediate cavity W (27); The first intermediate cavity C is connected with the second liquid control cavity T (24) through the valve path connection cavity F (8); The first intermediate cavity U (25) is connected with the second liquid control cavity S (23) through the valve path connection cavity K (15); The first liquid control cavity E (9) is connected with the rodless cavity (11) of the hydraulic cylinder (10) and the second intermediate cavity V (26) respectively through the first execution oil path (18); The first liquid control cavity Q (21) is connected with the rod cavity P (20) of the hydraulic cylinder (10) and the second intermediate cavity W (27) respectively through the second execution oil path (14).

6. The automatically reversing hydraulic motor of claim 5, wherein: The second intermediate chamber V (26) and the second intermediate chamber W (27) of the reversing valve B (16) are selectively communicated with the second input chamber N (19).

7. The automatically reversing hydraulic motor of claim 5 wherein: The second intermediate chamber V (26) and the second intermediate chamber W (27) of the reversing valve B (16) are selectively connected with the main oil return path B (28) through the second output chamber R (22).

8. The automatically reversing hydraulic motor of claim 5, wherein: The first intermediate chamber U (25) and the first intermediate chamber C of the reversing valve A (13) are selectively connected with the main oil return path B (28) through the first output chamber L (17). The piston part (12) is arranged between the rodless chamber (11) and the rod chamber P (20). The reversing valve A (13) and the reversing valve B (16) are two-position four-way reversing valves.

9. A test bench for automatically commutated hydraulic motors, characterized in that: The hydraulic motor is used for pressure test, and the hydraulic motor comprises a motor body (61); a lifting ring part (62) is arranged on the motor body (61); The test bench comprises a test bench body (60); A stroke assembly (63), a connecting pipe assembly (64) and a lifting ring adjusting hand (65) are arranged on the test bench body (60); A plurality of positioning bases (66) of different specifications are arranged on the test bench body (60); A bottom hole is arranged on the positioning base (66); An elastic alignment head (67) is arranged on the test bench body (60); A matching process groove is arranged on the motor body (61); The stroke assembly (63) comprises a vertically arranged stroke spring rod part (68); a pressure sensor (69) is arranged on the cantilever end of the stroke spring rod part (68); and the pressure sensor (69) is used for abutting against the downward piston part (12); The connecting pipe assembly (64) comprises a hydraulic connector moving assembly (70) on the test bench body (60); the hydraulic connector moving assembly (70) at least has lifting and horizontal moving actions; A butt joint connector (71) is arranged on the hydraulic connector moving assembly (70), which is used for connecting the liquid path inlet (1) and the hydraulic source outlet (2) of the motor body (61) respectively; The lifting ring adjusting hand (65) comprises a linear driving hand A (72) and a linear driving hand B (73) arranged oppositely on the test bench body (60); An oblique pushing hand (74) is arranged at the end of the linear driving hand A (72) and the linear driving hand B (73); The linear driving hand A (72) and the linear driving hand B (73) are arranged in parallel, and the distance between them is greater than the thickness of the lifting ring part (62) and less than 1 / 2 of the outer diameter of the lifting ring part (62); During the test, first, the matching positioning base (66) is installed on the test bench body (60); then, the motor body (61) is installed on the positioning base (66), and the elastic alignment head (67) is aligned and then fixed after being lowered; secondly, the hydraulic connector moving assembly (70) is moved, so that the butt joint connector (71) is aligned with the liquid path inlet (1) and the hydraulic source outlet (2) respectively, and the pressure sensor (69) abuts against the downward piston part (12); Start the pump station, execute the hydraulic motor control method, and perform the test; First, start the constant pressure test; Then, the safety limit test is carried out, when the set safety pressure is reached, the overflow valve core (6) drives the indicating rod to rise; the safety threshold band (44) reaches the limit switch (38) and is clamped; through the stroke spring rod part (68) lifting stroke and the pressure sensor (69), the stroke distance of the piston part (12) is detected; Further, the limit switch (38) is driven by the reset push hand part (75) to change from the inclined state to the horizontal state, and the limit spring (40) is separated from the safety threshold band (44); Next, through the gear and rack mechanism, the straight line driving hand A (72) and the straight line driving hand B (73) are driven to move towards each other, and the inclined push hand (74) rotates the hanging ring part (62) in the opposite direction along the spiral direction; Further, the motor body (61) is loosened, the hook is hung on the hanging ring part (62), the elastic alignment top head (67) is used to top the motor body (61), so that the motor body (61) is lifted and transported away.

10. A method of controlling an automatically reversing hydraulic motor, characterized by: The hydraulic motor according to claim 1; The control method performs the following steps: Step one, when the hydraulic source enters the throttle valve (3) for flow regulation through the liquid path inlet (1), enters the main liquid inlet cavity A (4), then enters the second input cavity N (19), enters the first execution oil path (18) through the second intermediate cavity V (26), and finally enters the first liquid control cavity E (9) and the rodless cavity (11), the hydraulic oil pushes the reversing valve A (13) and the piston part (12); Step two, as the pressure in the main liquid inlet cavity A (4) rises, the overflow valve core (6) is pushed to move, the main liquid inlet cavity A (4) and the direction control input cavity B (7) are connected, the hydraulic oil enters the first intermediate cavity U (25), then enters the second liquid control cavity S (23) through the valve path connecting cavity K (15); push the reversing valve B (16) to move, at this time, the second input cavity N (19) and the second intermediate cavity W (27), the second execution oil path (14), the rod cavity P (20) are connected, after the piston part (12) and the reversing valve A (13) are pushed to move, the second output cavity R (22) and the second intermediate cavity V (26), the valve path connecting cavity F (8), the rodless cavity (11), the hydraulic source outlet (2) are connected, and the reversing is completed; Continue to supply oil, repeat the above cycle, realize the action of the piston part (12).

Images