Electro-hydraulic loading valve system

Abstract

The present invention discloses an electro-hydraulic placeholder loading valve system, which is suitable for use in loading various mechanical equipment, including a placeholder loading mechanism and an oil replenishing system. The placeholder loading mechanism is installed on the external mechanical equipment that needs to be loaded, and the pressure-maintaining cylinder of the placeholder loading mechanism is connected to the hydraulic cylinder on the equipment. The static hydraulic oil in the pressure-maintaining cylinder is compressed and pressurized by the servo motor-screw mechanism to enable the equipment to obtain the required loading force; the oil replenishing system is used to replenish oil to the placeholder loading mechanism. When the hydraulic oil in the pressure-maintaining cylinder leaks and cannot reach the required oil pressure, the magnetic limit switch and the pressure transmitter are used to control the electro-hydraulic proportional valve to replenish oil and pressurize the pressure-maintaining cylinder. The present invention realizes electronically controlled loading, which can solve the labor cost of manual loading and the shortcomings of existing electronically controlled loading, and also has the characteristics of compact structure, stable loading and high precision.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic valves, and in particular relates to a universal programmable electro-hydraulic occupying loading valve system. Background Art

[0002] In recent years, with the development of industrial automation in my country, industrial automation has been paid more and more attention by people, and more and more production fields have begun to use automation to reduce labor costs and labor intensity and improve production efficiency. At present, some equipment in the industrial field is loaded by manually hanging weights, which is time-consuming and labor-intensive to use; some are loaded by finished hydraulic valves such as proportional valves. Although such equipment can be controlled by computer program to reduce manpower, such valves have the disadvantage of being easily blocked, and the cost of use and maintenance is high; in addition, there are servo electric cylinders that have been popular in recent years, which are more suitable for small load equipment and not suitable for equipment that requires large loads. For this reason, a universal programmable electro-hydraulic position loading valve system is specially invented, which reduces labor costs and labor intensity, and makes up for the shortcomings of several commonly used loading methods. Summary of the invention

[0003] The purpose of the present invention is to provide an electro-hydraulic occupying loading valve system for various equipments requiring hydraulic loading in view of the deficiencies in the prior art.

[0004] The object of the present invention is achieved through the following technical solutions: an electro-hydraulic spacer loading valve system, comprising a spacer loading mechanism and an oil replenishment system; the oil replenishment system is connected to the spacer loading mechanism through an oil pipe;

[0005] The space-occupying loading mechanism includes a piston, a linear bearing flange, a pressing plate, a T-type lead screw, a driven wheel, a driving block, a synchronous belt, a driving wheel, a planetary reducer, a servo motor, a lead screw nut, a butterfly spring, a linear bearing and a pressure-maintaining cylinder;

[0006] The piston is installed in the pressure-maintaining oil cylinder, the pressure-maintaining oil cylinder is connected to the linear bearing flange, the linear bearing is installed in the linear bearing flange, a pressure plate is installed in the linear bearing, the butterfly spring is installed on one end of the pressure plate, and the other end is in contact with the screw nut; one end of the T-type screw is installed in the screw nut, and the other end is connected to the driving block; the driving block is installed on the driven wheel, and the driven wheel is connected to the driving wheel through a synchronous belt; the driving wheel is connected to the servo motor through a planetary reducer;

[0007] The oil replenishment system includes a gear pump, an electro-hydraulic proportional valve and a pressure transmitter; one end of the gear pump is connected to the oil tank through a pipeline, and the other end is connected to the electro-hydraulic proportional valve; the electro-hydraulic proportional valve is connected to the pressure-maintaining cylinder in the position-occupying loading mechanism through a pressure transmitter.

[0008] Furthermore, two Y-shaped sealing rings are installed on the piston, and the pressure-maintaining cylinder is filled with hydraulic oil, and the piston moves back and forth to compress the hydraulic oil.

[0009] Furthermore, a return spring is installed on the linear bearing flange, and the return spring is in contact with the pressing plate to play a role in resetting the pressing plate.

[0010] Furthermore, a magnetic ring, two O-rings and two anti-rotation bearings are installed on the screw nut, the O-rings are installed on both sides of the magnetic ring, and the anti-rotation bearings are installed on both sides of the screw nut.

[0011] Furthermore, one end of the T-type screw rod is connected to a support bearing and locked by a locking nut. The support bearing is installed in a support bearing sleeve. A bridge plate is installed on the upper end of the support bearing sleeve. A unloading flange is installed at one end of the bridge plate. A unloading bearing is installed on the unloading flange. A driven wheel is installed on the outer side of the unloading bearing. There is a gap between the driven wheel and the T-type screw rod; a planetary reducer is installed at the other end of the bridge plate.

[0012] Furthermore, the driving wheel is mounted on a driving wheel inner sleeve, and the driving wheel inner sleeve is mounted on an output shaft of a planetary reducer.

[0013] Furthermore, the T-type lead screw and the lead screw nut are matched and driven by a servo motor, and the lead screw nut can move forward and backward, and the oil pressure is adjusted by compressing the butterfly spring to pressurize the piston.

[0014] Furthermore, there is a gap between the support bearing and the end face of the T-type screw rod, and a load-bearing bearing is installed on the T-type screw rod to ensure that the support bearing does not bear the elastic force of the butterfly spring, and the elastic force is completely borne by the load-bearing bearing.

[0015] Furthermore, the system also includes an aluminum shell, in which an anti-rotation bearing, a magnetic ring, a T-type screw rod, a load-bearing bearing, an O-ring, a screw nut and a butterfly spring are installed; magnetic switches are installed on both sides of the outer side of the aluminum shell, which cooperate with the magnetic ring to limit the extreme position of the forward and backward movement of the screw nut.

[0016] Furthermore, the oil replenishment system also includes a coarse filter, a pump station motor, a first one-way valve, a relief valve, a one-way electromagnetic reversing valve, a fine filter and a second one-way valve;

[0017] The output shaft of the oil pump motor is connected to the gear pump, and the gear pump, the first one-way valve, the fine filter, the electro-hydraulic proportional valve, the second one-way valve and the pressure transmitter are connected in sequence. The oil inlet of the gear pump is connected to the oil tank pipeline through the coarse filter. The pipeline between the first one-way valve and the fine filter is connected with an overflow valve and a one-way electromagnetic reversing valve, and the other ends of the overflow valve and the one-way electromagnetic reversing valve are connected to the oil tank pipeline.

[0018] The beneficial effects of the present invention are as follows: the present invention uses a servo motor to control the loading of the position-occupying loading mechanism, and has the characteristics of compact structure, strong versatility, stable loading and high precision. It overcomes the time-consuming and labor-intensive problems of manual hanging weight loading and the disadvantage that the existing finished hydraulic valve is easy to be blocked, and reduces the use cost. The present invention makes up for the shortcomings of several commonly used loading methods and can be applied to various large and small mechanical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an appearance diagram of the electro-hydraulic occupying loading valve system of the present invention;

[0020] Figure 2 It is a structural diagram of the placeholder loading mechanism of the present invention;

[0021] Figure 3 This is an appearance diagram of the placeholder loading mechanism of the present invention;

[0022] Figure 4 It is the hydraulic principle diagram of the oil replenishment system of the present invention;

[0023] Figure 5 It is a schematic diagram of the electro-hydraulic occupying loading valve system of the present invention;

[0024] In the figure, the placeholder loading mechanism 1, the oil replenishment system 2, the Y-type sealing ring 3, the piston 4, the linear bearing flange 5, the aluminum housing 6, the pressing piece 7, the anti-rotation bearing 8, the magnetic ring 9, the T-type screw rod 10, the support bearing sleeve 11, the unloading flange 12, the driven wheel 13, the driving block 14, the unloading bearing 15, the synchronous belt 16, the protective cover 17, the driving wheel 18, the bridge plate 19, the driving wheel inner sleeve 20, the motor flange plate 21, the planetary reducer 22, the servo motor 23, the locking nut 24, Support bearing 25, load-bearing bearing 26, O-ring 27, lead screw nut 28, butterfly spring 29, return spring 30, linear bearing 31, hydraulic oil 32, pressure-maintaining cylinder 33, end cover 34, magnetic switch 35, coarse filter 36, gear pump 37, pump station motor 38, first one-way valve 39, overflow valve 40, one-way electromagnetic reversing valve 41, fine filter 42, electro-hydraulic proportional valve 43, second one-way valve 44, pressure transmitter 45 and cylinder 46 of external equipment. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0026] See attached Figure 1 The electro-hydraulic spacer loading valve system of this embodiment includes a spacer loading mechanism 1 and an oil replenishment system 2; the spacer loading mechanism 1 is connected to the oil cylinder of the external mechanical equipment to be loaded, and the oil replenishment system 2 is connected to the oil pipe of the spacer loading mechanism 1, which is used to replenish oil and pressurize the spacer loading mechanism 1.

[0027] See attached Figure 2 and attached Figure 3 The place-occupying loading mechanism 1 of the present embodiment includes a Y-shaped sealing ring 3, a piston 4, a linear bearing flange 5, an aluminum housing 6, a pressing piece 7, an anti-rotation bearing 8, a magnetic ring 9, a T-shaped screw 10, a supporting bearing sleeve 11, a unloading flange 12, a driven wheel 13, a driving block 14, an unloading bearing 15, a synchronous belt 16, a protective cover 17, a driving wheel 18, a bridge plate 19, a driving wheel inner sleeve 20, a motor flange plate 21, a planetary reducer 22, a servo motor 23, a locking nut 24, a supporting bearing 25, a load-bearing bearing 26, an O-ring 27, a screw nut 28, a butterfly spring 29, a reset spring 30, a linear bearing 31, hydraulic oil 32, a pressure-maintaining cylinder 33 and an end cover 34;

[0028] The piston 4 is installed in the pressure-maintaining oil cylinder 33, one end of the pressure-maintaining oil cylinder is equipped with an end cover 34, and the other end is connected to the linear bearing flange 5. Two Y-shaped sealing rings 3 are installed on the piston 4. A proper amount of hydraulic oil 32 is filled in the pressure-maintaining oil cylinder, and the piston can move back and forth to compress the hydraulic oil 32;

[0029] The linear bearing 31 is installed in the linear bearing flange 5, a pressing piece 7 is installed in the linear bearing 31, and a reset spring 30 is installed on the linear bearing flange 5 and contacts the pressing piece 7 to reset the pressing piece 7;

[0030] The anti-rotation bearing 8, magnetic ring 9, T-type lead screw 10, load-bearing bearing 26, O-ring 27, lead screw nut 28 and butterfly spring 29 are installed inside the aluminum shell 6; one end of the butterfly spring 29 is installed on the pressing plate 7, and the other end is in contact with the lead screw nut 28; the lead screw nut 28 is installed with a magnetic ring 9, two O-rings 27 and two anti-rotation bearings 8, the O-rings 27 are installed on both sides of the magnetic ring, and the anti-rotation bearings 8 are installed on both sides of the lead screw nut. One end of the T-type lead screw 10 is installed in the lead screw nut 28, and the other end is installed with a load-bearing bearing 26, a support bearing 25, a locking nut 24, and a driving block 14 in sequence. The locking nut 24 is in contact with the support bearing 25 to lock the support bearing 25.

[0031] The support bearing 25 is installed in the support bearing sleeve 11, the bridge plate 19 is installed on the upper end of the support bearing sleeve 11, a relief flange 12 is installed at one end of the bridge plate 19, a relief bearing 15 is installed on the relief flange 12, a driven wheel 13 is installed outside the relief bearing 15, a driving block 14 is installed on the upper end of the driven wheel 13, and the driving block 14 is connected to the T-type screw rod 10; a planetary reducer 22 is installed at the other end of the bridge plate 19, the planetary reducer 22 is connected to the servo motor 23, the driving wheel 18 is installed on the driving wheel inner sleeve 20, the driving wheel inner sleeve 20 is installed on the output shaft of the planetary reducer 22, and the driving wheel 18 and the driven wheel 13 are connected through a synchronous belt 16. The protective cover 17 is installed at both ends of the bridge plate 19, and covers the driving wheel 18 and the driven wheel 13 and other components therein.

[0032] See attached Figure 2 and attached Figure 3 The T-type screw rod 10 and the screw nut 28 of the spacer loading mechanism 1 of this embodiment are matched and driven by the servo motor 23. The screw nut 28 can move forward and backward, and the oil pressure is adjusted by compressing the butterfly spring 29 to pressurize the piston 4.

[0033] See attached Figure 2 and attached Figure 3 In the space-occupying loading mechanism 1 of this embodiment, there is a gap between the driven wheel 13 and the T-type screw rod 10. The driven wheel 13 is installed on the unloading bearing 15. The T-type screw rod 10 is driven to rotate by the driving block 14 to ensure that the T-type screw rod 10 does not bear the tensioning force of the synchronous belt 16. The tensioning force is completely borne by the unloading flange 12.

[0034] See attached Figure 2 and attached Figure 3 In the space-occupying loading mechanism 1 of this embodiment, there is a gap between the support bearing 25 and the end surface of the T-type screw rod 10 to ensure that the support bearing 25 does not bear the elastic force of the butterfly spring 29, and the elastic force is completely borne by the load-bearing bearing 26.

[0035] See attached Figure 2 and Figure 3 The pressure-maintaining cylinder 33 of the spacer loading mechanism 1 of this embodiment needs to be sealed to ensure that the internal hydraulic oil 32 will not leak easily after being compressed and pressurized by the piston 4.

[0036] See attached Figure 2 and Figure 3 The magnetic switches 35 distributed on both sides of the outer side of the aluminum housing 6 of the spacer loading mechanism 1 of this embodiment are used to limit the extreme position of the forward and backward movement of the screw nut 28.

[0037] See attached Figure 4The oil replenishment system 2 of this embodiment includes a coarse filter 36, a gear pump 37, a pump station motor 38, a first one-way valve 39, a relief valve 40, a one-way electromagnetic reversing valve 41, a fine filter 42, an electro-hydraulic proportional valve 43, a second one-way valve 44 and a pressure transmitter 45; the output shaft of the oil pump motor 38 is connected to the gear pump 37, the oil inlet of the gear pump 37 is connected to the oil tank pipeline through the coarse filter 36, the oil outlet is connected to the inlet end of the first one-way valve 39, and the outlet end of the first one-way valve 39 is connected to one end of the fine filter 42. An overflow valve 40 and a one-way electromagnetic reversing valve 41 are connected to the pipeline between the first one-way valve 39 and the fine filter 42. The other ends of the overflow valve 40 and the one-way electromagnetic reversing valve 41 are connected to the oil tank pipeline. The other end of the fine oil filter 42 is connected to the P interface of the electro-hydraulic proportional valve 43. The A interface of the electro-hydraulic proportional valve 43 is connected to the inlet end of the second one-way valve 44. The outlet end of the second one-way valve 44 is connected to one end of the pressure transmitter 45. The other end of the pressure transmitter 45 is connected to the pressure-maintaining cylinder 33 of the occupant loading mechanism 1.

[0038] See attached Figure 5 , the magnetic switch 35 of this embodiment is used to limit the limit position of the forward and backward movement of the screw nut 28, and the pressure transmitter 45 is used to detect the actual output oil pressure, and the forward and reverse rotation of the servo motor 23 is controlled by comparing it with the required output oil pressure, and the actual output oil pressure is adjusted by the forward and backward movement of the piston 4, wherein the pressure-maintaining oil cylinder 33 is connected to the oil cylinder 46 of the external device through the interface on the end cover 34. When the screw nut 28 has not reached the front-end limit position, the oil replenishment system 2 does not work, and the output oil pressure is only adjusted by the forward and reverse rotation of the servo motor 23; when the screw nut 28 reaches the front-end limit position, if the output oil pressure has not reached the required output oil pressure, the oil replenishment system 2 starts to work to replenish the hydraulic oil in the pressure-maintaining oil cylinder to increase the output oil pressure. When the output oil pressure is greater than the required oil pressure, the servo motor 23 starts to reverse and retreat to adjust the output oil pressure, and the oil replenishment system 2 stops working.

[0039] The electro-hydraulic occupying loading valve system of the present invention can be used for various equipment that requires hydraulic loading. When the equipment needs to be loaded, the servo motor moves to drive the T-type screw rod to rotate, and the screw nut moves forward and backward to push the piston to move forward and backward to adjust the oil pressure of the hydraulic oil in the pressure-maintaining cylinder, and apply the required oil pressure to the oil cylinder 46 of the external equipment. Equipped with an oil replenishing system, when the required oil pressure cannot be reached due to leakage, the oil replenishing system starts to work to replenish oil and increase pressure. The oil replenishing system works intermittently, which increases the service life of the hydraulic parts and maintains a quiet use environment.

[0040] The invention has compact structure, convenient installation, strong versatility, stable loading and high precision, and well makes up for the shortcomings of several commonly used loading methods, and can be applied to various equipment requiring hydraulic loading.

[0041] The above embodiments are used to illustrate the present invention rather than to limit the present invention. Any modification and change made to the present invention within the spirit of the present invention and the protection scope of the claims shall fall within the protection scope of the present invention.

Claims

1. An electro-hydraulic occupying loading valve system, characterized in that: It comprises a space-occupying loading mechanism (1) and an oil replenishing system (2); the oil replenishing system (2) is connected to the space-occupying loading mechanism (1) via an oil pipe; The space-occupying loading mechanism (1) comprises a piston (4), a linear bearing flange (5), a pressing plate (7), a T-type screw rod (10), a driven wheel (13), a driving block (14), a synchronous belt (16), a driving wheel (18), a planetary reducer (22), a servo motor (23), a screw rod nut (28), a butterfly spring (29), a linear bearing (31) and a pressure-maintaining oil cylinder (33); The piston (4) is installed in a pressure-maintaining cylinder (33), the pressure-maintaining cylinder (33) is connected to a linear bearing flange (5), the linear bearing (31) is installed in the linear bearing flange (5), a pressure plate (7) is installed in the linear bearing (31), the butterfly spring (29) is installed on one end of the pressure plate (7), and the other end is in contact with the screw nut (28); one end of the T-type screw (10) is connected to a support bearing (25) and is locked by a locking nut (24), the support bearing (25) is installed in a support bearing sleeve (11), a bridge plate (19) is installed on the upper end of the support bearing sleeve (11), a relief flange (12) is installed on one end of the bridge plate (19), a relief bearing (15) is installed on the relief flange (12), a driven wheel (13) is installed on the outer side of the relief bearing (15), and a gap is formed between the driven wheel (13) and the T-type screw (10); the bridge plate (1 9) is installed with a planetary reducer (22); a gap is provided between the support bearing (25) and the end surface of the T-type screw rod (10), and a load-bearing bearing (26) is installed on the T-type screw rod (10) to ensure that the support bearing (25) does not bear the elastic force of the butterfly spring (29), and the elastic force is completely borne by the load-bearing bearing (26); the T-type screw rod (10) and the screw nut (28) are adapted to each other and driven by a servo motor (23); the screw nut (28) can move forward and backward, and the oil pressure is adjusted by compressing the butterfly spring (29) to pressurize the piston (4); one end of the T-type screw rod (10) is installed in the screw nut (28), and the other end is connected to the driving block (14); the driving block (14) is installed on the driven wheel (13), and the driven wheel (13) is connected to the driving wheel (18) through a synchronous belt (16); the driving wheel (18) is connected to the servo motor (23) through a planetary reducer (22); The oil replenishment system (2) comprises a coarse filter (36), a gear pump (37), a pump station motor (38), a first one-way valve (39), a relief valve (40), a one-way electromagnetic reversing valve (41), a fine filter (42), an electro-hydraulic proportional valve (43), a second one-way valve (44) and a pressure transmitter (45); the output shaft of the pump station motor (38) is connected to the gear pump (37), and the gear pump (37), the first one-way valve (39), the fine filter (42), the electro-hydraulic proportional valve (43), the second one-way valve (44) and the pressure transmitter (45) are connected in sequence. The oil inlet of the gear pump (37) is connected to the oil tank pipeline through a coarse filter (36); a relief valve (40) and a one-way electromagnetic reversing valve (41) are connected to the pipeline between the first one-way valve (39) and the fine filter (42); the other ends of the relief valve (40) and the one-way electromagnetic reversing valve (41) are both connected to the oil tank pipeline; one end of the gear pump (37) is connected to the oil tank through a pipeline, and the other end is connected to an electro-hydraulic proportional valve (43); the electro-hydraulic proportional valve (43) is connected to the pressure-maintaining cylinder (33) in the position-occupying loading mechanism (1) through a pressure transmitter (45).

2. The electro-hydraulic occupying loading valve system according to claim 1, characterized in that: Two Y-shaped sealing rings (3) are installed on the piston (4), and the pressure-maintaining oil cylinder (33) is filled with hydraulic oil (32). The piston (4) moves forward and backward to compress the hydraulic oil (32).

3. The electro-hydraulic occupying loading valve system according to claim 1, characterized in that: A return spring (30) is mounted on the linear bearing flange (5); the return spring (30) is in contact with the pressing plate (7) and serves to return the pressing plate (7).

4. The electro-hydraulic occupying loading valve system according to claim 1, characterized in that: The screw nut (28) is mounted with a magnetic ring (9), two O-rings (27) and two anti-rotation bearings (8), the O-rings (27) being mounted on both sides of the magnetic ring (9), and the anti-rotation bearings (8) being mounted on both sides of the screw nut (28).

5. The electro-hydraulic occupying loading valve system according to claim 1, characterized in that: The driving wheel (18) is mounted on a driving wheel inner sleeve (20), and the driving wheel inner sleeve (20) is mounted on an output shaft of a planetary reducer (22).

6. The electro-hydraulic occupation loading valve system according to claim 1, characterized in that: The system also includes an aluminum housing (6), wherein an anti-rotation bearing (8), a magnetic ring (9), a T-type lead screw (10), a load-bearing bearing (26), an O-ring (27), a lead screw nut (28) and a butterfly spring (29) are installed inside the aluminum housing (6); magnetic switches (35) are installed on both sides of the outer side of the aluminum housing (6), which cooperate with the magnetic ring (9) to limit the extreme position of the forward and backward movement of the lead screw nut (28).

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