Electro-hydraulic actuator with external driving function for barrier machine

Abstract

The invention discloses an electro-hydraulic actuator with an external driving function for a barrier machine. The electro-hydraulic actuator comprises a double-output-shaft motor, a two-way hydraulic pump, a one-way valve, a manual adjusting overflow valve, a pressure measuring connector, a two-way hydraulic lock, a hydraulic damper, a hydraulic oil cylinder, an oil tank, a hydraulic valve block, a hydraulic steel pipe and an oil cylinder valve block. The hydraulic system adopts a closed loop, so that stretching and retracting actions of the actuator can be realized. A hydraulic damper installed in the valve block can effectively restrain fluctuation load generated by inertia and gravity of the handrail, and it is guaranteed that the handrail acts stably and does not shake during sudden stop. The double-outlet-rod motor is adopted for driving, when the motor is powered off or breaks down, the action of the actuator can be achieved through external rotation driving, and safety is high.

Description

Technical Field

[0001] The invention relates to the field of hydraulic driving, and in particular to an electro-hydraulic actuator for a wood fence with an external drive function. Background Art

[0002] Traditional wood barrier machines use multi-stage gear transmission, and the motor drives the gears and drive shafts to achieve the lifting and lowering of the railings. They have many transmission parts, complex structures, and poor maintainability.

[0003] The structure of a hydraulic cylinder plus a slider, a fork, and a rotating shaft can convert linear motion into rotational motion, but a hydraulic pump station is required to drive the cylinder. Adding hydraulic oil pipes and oil tanks will make the hydraulic drive box larger and difficult to maintain.

[0004] When the fence is performing the action of dropping the fence, the heavy weight of the fence will form a certain overload. In this case, the cylinder is prone to stall. After the fence rises to more than 90 degrees, the load force acting on the cylinder will change direction, so both chambers of the cylinder may experience overload. In addition, because the fence is long, the inertia of the fence is large when the action stops, causing the pressure in the two chambers of the cylinder to fluctuate and the fence to shake.

[0005] As the timber barrier involves road safety, it must be able to perform lifting and lowering actions manually or through external drive when the motor fails. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an electro-hydraulic actuator for a wood fence with an external drive function. The electro-hydraulic actuator has a compact structure, is easy to maintain, moves smoothly, and can be externally operated.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] An electro-hydraulic actuator for a wood fence with an external drive function, comprising a double-shaft motor, a bidirectional hydraulic pump, a one-way valve, a two-way valve, a one-way valve, a manually adjusted overflow valve, a two-way overflow valve, a pressure measuring joint, a two-way hydraulic lock, a hydraulic damper, a two-way hydraulic damper, a three-way valve, a hydraulic oil cylinder, an oil tank, a hydraulic valve block, a hydraulic steel pipe, an oil cylinder valve block, a one-pressure regulating screw plug, a two-pressure regulating screw plug, a one-pressure regulating throat plug, and a two-pressure regulating throat plug;

[0009] The double-output shaft motor drives the bidirectional hydraulic pump to rotate, the forward port of the one-way valve one is connected to the oil tank, and the reverse port of the one-way valve one is connected to the left oil port of the bidirectional hydraulic pump; the forward port of the one-way valve two is connected to the oil tank, and the reverse port of the one-way valve two is connected to the right oil port of the bidirectional hydraulic pump; the inlet of the manual relief valve two is connected to the left oil port of the bidirectional hydraulic pump, and the outlet is connected to the oil tank; the inlet of the manual relief valve one is connected to the right oil port of the bidirectional hydraulic pump, and the outlet is connected to the oil tank; the bidirectional hydraulic lock is connected to the left and right oil ports of the bidirectional hydraulic pump and the hydraulic The two chambers of the hydraulic oil cylinder are connected to achieve position locking of the hydraulic oil cylinder; the pressure measuring joint 2 is installed between the left one-way valve of the two-way hydraulic lock and the left oil port of the two-way hydraulic pump, and the pressure measuring joint 1 is installed between the right one-way valve of the two-way hydraulic lock and the right oil port of the two-way hydraulic pump; the hydraulic damper 2 is connected in parallel with the one-way valve 3, one end of both of which is connected to the left one-way valve of the two-way hydraulic lock, and the other end of both is connected to the large chamber of the hydraulic oil cylinder; one end of the hydraulic damper 1 is connected to the right one-way valve of the two-way hydraulic lock, and the other end is connected to the small chamber of the hydraulic oil cylinder.

[0010] Furthermore, the automatic control process of the oil circuit when the piston rod of the hydraulic cylinder extends is as follows: the double-output shaft motor rotates clockwise, the left side of the hydraulic pump is the high-pressure oil discharge port, the oil enters the large chamber of the hydraulic cylinder through the left hydraulic control one-way valve and the one-way valve three in the two-way hydraulic lock, and at the same time, the high-pressure oil enters the right control chamber of the two-way hydraulic lock, opens the one-way valve on the right side of the hydraulic lock, and the small chamber circuit of the hydraulic cylinder is connected, the high-pressure oil pushes the piston rod to extend, and the low-pressure oil in the large chamber of the hydraulic cylinder enters the right suction port of the hydraulic pump. Since the hydraulic cylinder is an asymmetric cylinder, the low-pressure oil discharged from the small chamber is less than the oil inlet of the large chamber, and the oil tank replenishes oil to the right suction port of the hydraulic pump through the one-way valve; when the pressure of the left high-pressure circuit reaches the pressure set by the overflow valve two, a part of the left high-pressure oil overflows back to the oil through the overflow valve.

[0011] Furthermore, the automatic control process of the oil circuit when the piston rod of the hydraulic cylinder is extended into place is as follows: the double-output shaft motor continues to rotate clockwise. Since the hydraulic cylinder has been extended into place, the high-pressure oil no longer enters the large chamber of the hydraulic cylinder, and directly overflows and returns the oil through the overflow valve 2. No return oil is discharged from the small chamber of the hydraulic cylinder, and the right side oil suction port of the hydraulic pump draws oil from the oil tank through the one-way valve 1.

[0012] Furthermore, the automatic control process of the oil circuit when the piston rod of the hydraulic cylinder retracts is as follows: the double-output shaft motor rotates counterclockwise, the right side of the hydraulic pump is the high-pressure oil discharge port, the oil enters the small chamber of the hydraulic cylinder through the right hydraulic-controlled one-way valve in the two-way hydraulic lock and the hydraulic damper, and at the same time, the high-pressure oil enters the left control chamber of the two-way hydraulic lock, opens the left one-way valve of the two-way hydraulic lock, and the large chamber circuit of the hydraulic cylinder is connected, the high-pressure oil pushes the piston rod to retract, and the low-pressure oil in the large chamber of the hydraulic cylinder enters the left oil suction port of the hydraulic pump; since the hydraulic cylinder is an asymmetric cylinder, the low-pressure oil discharged from the large chamber is more than the oil inlet of the small chamber, that is, the oil suction volume of the hydraulic pump is greater than the oil discharge volume. At this time, regardless of the load size, a part of the oil at the high-pressure port of the hydraulic pump must overflow through the overflow valve, thereby reducing the oil entering the small chamber of the hydraulic cylinder, ensuring that the return oil volume of the large chamber of the hydraulic cylinder is consistent with the oil discharge volume of the pump port.

[0013] Furthermore, the automatic control process of the oil circuit when the piston rod of the hydraulic cylinder is retracted into position is as follows: the double-output shaft motor continues to rotate counterclockwise. Since the hydraulic cylinder has been retracted into position, the high-pressure oil no longer enters the small chamber of the hydraulic cylinder, and directly overflows and returns the oil through the overflow valve 1. No return oil is discharged from the large chamber of the hydraulic cylinder, and the left oil suction port of the hydraulic pump draws oil from the oil tank through the one-way valve 2.

[0014] Furthermore, the dual-shaft motor is a DC motor, and both the front and rear end faces have protruding shafts; the flange surface of the dual-shaft motor is fitted and fixed to the front end face of the hydraulic valve block, and the protruding shaft in the direction of the mounting flange end face passes through the hydraulic valve block and is directly connected to the bidirectional hydraulic pump, and the two sides of the bottom end of the tail protruding shaft are flat; the bidirectional hydraulic pump is fixed to the rear end circular surface of the hydraulic valve block, and the two oil ports of the bidirectional hydraulic pump are sealed with the oil ports on the hydraulic valve block with O-rings, the oil tank is fitted with the rear end rectangular surface of the hydraulic valve block, and a radial O-ring is used to seal the cylindrical surface of the hydraulic valve block; the hydraulic steel pipe and the cylinder valve block are fixed to the cylinder barrel of the hydraulic cylinder, the upper end face of the cylinder valve block is fixed to the lower end face of the hydraulic valve block, and is sealed with an O-ring, and the two chambers of the hydraulic cylinder are connected through the hydraulic steel pipe and the cylinder valve block.

[0015] Furthermore, the one-way valve 1 and the one-way valve 2 are installed on the two-way hydraulic pump.

[0016] Further, the hydraulic valve block is provided with a first through horizontal flow channel and a fourth non-through horizontal flow channel on the right side surface, a second through horizontal flow channel and a third through horizontal flow channel on the left side surface, a first vertical flow channel, a second vertical flow channel and a third vertical flow channel on the upper end surface, a fourth vertical flow channel, a fifth vertical flow channel and a sixth vertical flow channel on the lower end surface, and a first parallel flow channel, a second parallel flow channel, a third parallel flow channel, a fourth parallel flow channel and a fifth parallel flow channel on the front cylindrical surface;

[0017] The two-way hydraulic lock and the one-way valve 3 are respectively screwed into the third horizontal flow channel from both ends of the third horizontal flow channel through threads;

[0018] The hydraulic damper 1 and the hydraulic damper 2 are both external threaded structures, with hexagonal grooves on the end faces and thinner oil holes inside. The hydraulic damper 1 is screwed into the fourth vertical flow channel through threads, and the hydraulic damper 2 is screwed into the fifth vertical flow channel through threads; the pressure measuring joint and the manual relief valve 1 are respectively installed in the second horizontal flow channel from both ends; the pressure regulating throat plug 1 is screwed into the second horizontal flow channel through threads, pressing the manual relief valve 1 clockwise, and the outermost end is sealed with the oil return port of the manual relief valve 1 through the pressure regulating screw plug 1;

[0019] The manual relief valve 2 and the pressure measuring joint 1 are respectively installed in the first horizontal flow channel from both ends of the first horizontal flow channel. The structure and installation method of the manual relief valve 2 are the same as those of the manual relief valve 1, but the manual relief valve 2 and the manual relief valve 1 are located on different sides of the hydraulic valve block, and the ends of the manual relief valve 2 are tightened and sealed by the pressure regulating throat plug 2 and the pressure regulating screw plug 2 in turn.

[0020] The bidirectional hydraulic lock and the one-way valve 3 are respectively installed in the third horizontal flow channel from both ends of the third horizontal flow channel; the fourth horizontal flow channel is a process hole, cross-connected with the first vertical flow channel and the fifth parallel flow channel, and sealed by a screw plug; the first vertical flow channel is a process hole, cross-connected with the first horizontal flow channel, the fourth horizontal flow channel, and the fourth parallel flow channel, and sealed by a screw plug; the second vertical flow channel is a process hole, cross-connected with the first horizontal flow channel, and sealed by a screw plug; the third vertical flow channel. is a process hole, cross-connected with the second horizontal flow channel. and the third parallel flow channel., and sealed by a screw plug;

[0021] The hydraulic damper is installed in the fourth vertical flow channel, and the fourth vertical flow channel is cross-connected with the third horizontal flow channel, and is connected to the small chamber of the hydraulic oil cylinder; the hydraulic damper is installed in the fifth vertical flow channel, and the fifth vertical flow channel is cross-connected with the third horizontal flow channel, and is connected to the large chamber of the hydraulic oil cylinder; the sixth vertical flow channel is cross-connected with the third horizontal flow channel, and is connected to the large chamber of the hydraulic oil cylinder; the first parallel flow channel is cross-connected with the second vertical flow channel, and is connected to the oil tank; the second parallel flow channel is cross-connected with the second horizontal flow channel, and is connected to the oil tank; the third parallel flow channel is cross-connected with the third vertical flow channel, and is connected to the right oil port of the hydraulic pump; the fourth parallel flow channel is cross-connected with the first vertical flow channel, and is connected to the left oil port of the hydraulic pump; the fifth parallel flow channel is a process hole, which is cross-connected with the third horizontal flow channel and the fourth horizontal flow channel, and is sealed by a screw plug.

[0022] Furthermore, the manual relief valve comprises a steel ball base, a steel ball, a spring base and a pressure regulating spring, wherein the steel ball base is installed in the step hole of the second horizontal flow channel of the hydraulic valve block using an interference fit, and the steel ball, spring base and pressure regulating spring are installed in sequence.

[0023] Furthermore, the hydraulic cylinder is a single-rod piston cylinder, the tail end of the extension rod has an external thread, which can be fixed to the peripheral mechanism by a nut, and the cylinder barrel can be fixed to the peripheral mechanism by two bolts.

[0024] The beneficial effects of the present invention are as follows:

[0025] 1. The present invention realizes the extension and retraction of the oil cylinder by controlling the rotation direction of the motor, and adopts a hydraulic drive mode to output a large thrust without installing a high-power motor.

[0026] 2. The present invention adopts an integrated design with a compact structure, no external hydraulic hoses, and is easy to install and maintain.

[0027] 3. The present invention can effectively suppress the fluctuating loads caused by the inertia and gravity of the handrail, ensuring that the handrail moves smoothly and does not shake during an emergency stop.

[0028] 4. The present invention adopts a double-rod motor drive. When the motor is powered off or fails, the actuator can be driven by an external rotation, which is highly safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the hydraulic principle of an electro-hydraulic actuator for a wood fence with an external drive function according to an embodiment of the present invention.

[0030] Figure 2 It is a three-dimensional diagram of an electro-hydraulic actuator for a wood fence with an external drive function according to an embodiment of the present invention.

[0031] Figure 3 A rear view of an electro-hydraulic actuator for a wood fence with an external drive function according to an embodiment of the present invention.

[0032] Figure 4 It is an exploded view of an electro-hydraulic actuator for a wood fence with an external drive function according to an embodiment of the present invention.

[0033] Figure 5 It is an exploded schematic diagram of the hydraulic valve block integration according to an embodiment of the present invention.

[0034] Figure 6 It is a front view and a left view of the integrated installation of the hydraulic valve block of the present invention.

[0035] Figure 7 yes Figure 6 AA section view.

[0036] Figure 8 yes Figure 6 BB cross-sectional view.

[0037] Fig. 9 yes Figure 6 CC cross-sectional view.

[0038] Fig.10 It is a schematic diagram of the oil circuit under the extension action of the piston rod of the hydraulic oil cylinder of the present invention.

[0039] Fig.11 It is a schematic diagram of the oil circuit when the piston rod of the hydraulic oil cylinder of the present invention is in a state of being fully extended.

[0040] Fig.12 It is a schematic diagram of the oil circuit under the retracting action of the piston rod of the hydraulic oil cylinder of the present invention.

[0041] Fig.13 It is a schematic diagram of the oil circuit when the piston rod of the hydraulic oil cylinder of the present invention is retracted into position.

[0042] In the figure, 1 is a double-output shaft motor, 2 is a bidirectional hydraulic pump, 3.1 is a one-way valve 1, 3.2 is a one-way valve 2, 4.1 is a hand-adjustable overflow valve 1, 4.2 is a hand-adjustable overflow valve 2, 4.1.1 is a steel ball base, 4.1.2 is a steel ball, 4.1.3 is a spring base, 4.1.4 is a pressure regulating spring, 5.1 is a pressure measuring joint 1, 5.2 is a pressure measuring joint 2, 6 is a bidirectional hydraulic lock, 7.1 is a hydraulic damper 1, 7.2 is a hydraulic damper 2, 8 is a one-way valve, 9 is a hydraulic cylinder, 10 is an oil tank, 11 is a hydraulic valve block, 11.1 is a first horizontal flow channel, 11.2 is a second horizontal flow channel, 11.3 is a third horizontal flow channel, 11.4 is The fourth horizontal flow channel, 11.5 is the first vertical flow channel, 11.6 is the second vertical flow channel, 11.7 is the third vertical flow channel, 11.8 is the fourth vertical flow channel, 11.9 is the fifth vertical flow channel, 11.10 is the sixth vertical flow channel, 11.11 is the first parallel flow channel, 11.12 is the second parallel flow channel, 11.13 is the third parallel flow channel, 11.14 is the fourth parallel flow channel, 11.15 is the fifth parallel flow channel; 12 is the oil filling port, 13 is the oil drain port, 14 is the hydraulic steel pipe, 15 is the cylinder valve block, 16.1 is the pressure regulating screw plug one, 16.2 is the pressure regulating screw plug two, 17.1 is the pressure regulating throat plug one, and 17.2 is the pressure regulating throat plug two. DETAILED DESCRIPTION

[0043] The present invention will be described in detail below based on the accompanying drawings and preferred embodiments, and the purpose and effects of the present invention will become more clear. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the electro-hydraulic actuator for a wood fence with an external drive function in this embodiment includes a double-output shaft motor 1, a bidirectional hydraulic pump 2, a one-way valve 3.1, a one-way valve 3.2, a manually adjusted overflow valve 4.1, a manually adjusted overflow valve 4.2, a pressure measuring joint 5.1, a pressure measuring joint 5.2, a bidirectional hydraulic lock 6, a hydraulic damper 7.1, a hydraulic damper 7.2, a one-way valve 3 8, a hydraulic cylinder 9, an oil tank 10, a hydraulic valve block 11, an oil filling port 12, an oil drain port 13, a hydraulic steel pipe 14, a cylinder valve block 15, a pressure regulating screw plug 16.1, a pressure regulating screw plug 2 16.2, a pressure regulating throat plug 17.1 and a pressure regulating throat plug 2 17.2.

[0045] The electro-hydraulic actuator of this embodiment is of integrated design, and the dual-shaft motor 1, oil tank 10, bidirectional hydraulic pump 2, hydraulic valve block 11, and hydraulic cylinder 9 are installed in a modular manner, without the need to install hydraulic hoses.

[0046] The flange surface of the double-shaft motor 1 fits with the front end surface of the hydraulic valve block 11 and is fixed by bolts. The double-shaft motor 1 is a DC motor with protruding shafts on both the front and rear end surfaces. The protruding shaft in the direction of the mounting flange end surface is directly connected to the bidirectional hydraulic pump 2, and the two sides of the bottom end of the tail protruding shaft are flat. The bidirectional hydraulic pump 2 fits with the rear circular surface of the hydraulic valve block 11 and is fixed with two bolts. The two oil ports on the pump and the oil ports on the valve block are sealed with O-rings. The oil tank 10 fits with the rear rectangular surface of the hydraulic valve block 11 through 4 bolts, and a radial O-ring is used to seal the cylindrical surface of the valve block. The hydraulic steel pipe 14 and the cylinder valve block 15 are welded on the cylinder barrel of the hydraulic cylinder 9. The upper end surface of the cylinder valve block 15 fits with the lower end surface of the hydraulic valve block 11, fixed with 4 bolts, and sealed with an O-ring. The two chambers of the hydraulic cylinder 9 are connected through the hydraulic steel pipe 14 and the cylinder valve block 15.

[0047] The oil tank 10 is a closed rectangular oil tank. Oil is added to the oil tank 1 through the oil filling port 12 on the upper end surface of the oil tank 10. When the oil is replaced, the oil is drained through the oil drain port 13 at the bottom of the rear surface of the oil tank 10. The hydraulic cylinder 9 is a single-rod piston cylinder. The rear end of the extended rod has an external thread, which can be fixed to the peripheral mechanism by a nut, and the cylinder barrel can be fixed to the peripheral mechanism by two bolts.

[0048] Hydraulic principle diagram Figure 1As shown, the small-chamber circuit of the oil cylinder includes a one-way valve 3.1, an overflow valve 4.1, a pressure measuring interface 5.1, the right-side oil circuit of the two-way hydraulic lock 6, and a hydraulic damper 7.1; the large-chamber circuit of the oil cylinder includes a one-way valve 3.2, an overflow valve 4.2, a pressure measuring interface 5.2, the left-side oil circuit of the two-way hydraulic lock 6, a hydraulic damper 7.2, and a one-way valve 8. Among them, the double-output shaft motor 1 drives the bidirectional hydraulic pump 2 to rotate, the forward port of the one-way valve 3.1 is connected to the oil tank 10, and the reverse port of the one-way valve 3.1 is connected to the left oil port of the bidirectional hydraulic pump 2; the forward port of the one-way valve 3.2 is connected to the oil tank 10, and the reverse port of the one-way valve 3.2 is connected to the right oil port of the bidirectional hydraulic pump 2; the inlet of the manual relief valve 4.2 is connected to the left oil port of the bidirectional hydraulic pump 2, and the outlet is connected to the oil tank 1; the inlet of the manual relief valve 4.1 is connected to the right oil port of the bidirectional hydraulic pump 2, and the outlet is connected to the oil tank 1; the bidirectional hydraulic lock 6 is connected to the left and right oil ports of the bidirectional hydraulic pump 2 and the two chambers of the hydraulic cylinder 9 to lock the position of the hydraulic cylinder 9. Pressure measuring joint 2 5.2 is installed between the left one-way valve of the two-way hydraulic lock 6 and the left oil port of the two-way hydraulic pump 2, and pressure measuring joint 1 5.1 is installed between the right one-way valve of the two-way hydraulic lock 6 and the right oil port of the two-way hydraulic pump 2; hydraulic damper 2 7.2 is connected in parallel with one-way valve 3 8, one end of both is connected to the left one-way valve of the two-way hydraulic lock 6, and the other end of both is connected to the large cavity of the hydraulic cylinder 9; one end of hydraulic damper 1 7.1 is connected to the right one-way valve of the two-way hydraulic lock 6, and the other end is connected to the small cavity of the hydraulic cylinder 9. Hydraulic damper 1 7.1 and hydraulic damper 2 7.2 are both threaded fixed dampers, which are used to form a certain resistance to the hydraulic circuit so that the cylinder moves smoothly without shaking.

[0049] like Figure 5As shown, except for the one-way valve 1 3.1 and the one-way valve 2 3.2 installed on the two-way hydraulic pump 2, the other hydraulic valves are installed in the hydraulic valve block 11. The two-way hydraulic lock 6 is a plug-in structure, which is screwed into the third horizontal flow channel 11.3 of the hydraulic valve block through a thread. The hydraulic dampers 7.1 and 7.2 are both external threaded structures, with hexagonal grooves on the end faces and thinner oil holes inside, which are screwed into the fourth vertical flow channel 11.8 and the fifth vertical flow channel 11.9 of the hydraulic valve block through a thread. The one-way valve 3 8 is a screw-in threaded one-way valve installed in the third horizontal flow channel 11.3. The manual relief valve 1 4.1 includes a steel ball base 4.1.1, a steel ball 4.1.2, Spring base 4.1.3 and pressure regulating spring 4.1.4, wherein steel ball base 4.1.1 is installed in the step hole of the second horizontal flow channel 11.2 of the hydraulic valve block 11, using interference fit, steel ball 4.1.2, spring base 4.1.3, pressure regulating spring 4.1.4 are installed in sequence, pressure regulating throat plug 17.1 is screwed into the second horizontal flow channel 11.2 through a thread, pressing the rear section of the pressure regulating spring, pressure regulating throat plug 17.1 compresses the spring clockwise, the set pressure of the manual relief valve 14.1 increases, the spring is relaxed counterclockwise, the set pressure of the manual relief valve 14.1 decreases, and the oil return port of the manual relief valve 14.1 is sealed by the pressure regulating screw plug 16.1. Manual relief valve 2 4.2 is installed in the first horizontal flow channel 11.1 in the same way. The process holes on the hydraulic valve block 11 are all sealed with screw plugs.

[0050] like Figure 6 , 7As shown in Figures 8 and 9, the first horizontal flow channel 11.1 is equipped with a manually adjusted overflow valve 4.2, a pressure measuring joint 1 5.1, a pressure regulating screw plug 16.2, and a pressure regulating throat plug 17.2; the second horizontal flow channel 11.2 is equipped with a manually adjusted overflow valve 4.1, a pressure measuring joint 2 5.2, a pressure regulating screw plug 16.1, and a pressure regulating throat plug 17.1; the third horizontal flow channel 11.3 is equipped with a two-way hydraulic lock 6 and a one-way valve 3 8; the fourth horizontal flow channel 11.4 is a process hole, which is parallel to the first vertical flow channel 11.5 and the fifth horizontal flow channel 11.6. The first vertical flow channel 11.5 is a process hole, which is cross-connected with the first horizontal flow channel 11.1, the fourth horizontal flow channel 11.4, and the fourth parallel flow channel 11.14, and is sealed by a screw plug; the second vertical flow channel 11.6 is a process hole, which is cross-connected with the first horizontal flow channel 11.1 and is sealed by a screw plug; the third vertical flow channel 11.7 is a process hole, which is cross-connected with the second horizontal flow channel 11.2 and the third parallel flow channel 11.13, and is sealed by a screw plug. ; The fourth vertical flow channel 11.8 is equipped with a hydraulic damper 7.1, which crosses and communicates with the third horizontal flow channel 11.3 and is connected to the small chamber of the oil cylinder; the fifth vertical flow channel 11.9 is equipped with a hydraulic damper 7.2, which crosses and communicates with the third horizontal flow channel 11.3 and is connected to the large chamber of the oil cylinder; the sixth vertical flow channel 11.10 crosses and communicates with the third horizontal flow channel 11.3 and is connected to the large chamber of the oil cylinder; the first parallel flow channel 11.11 crosses and communicates with the second vertical flow channel 11.6 and is connected to the oil tank 10 The second parallel flow channel 11.12 is cross-connected with the second horizontal flow channel 11.2 and is connected to the oil tank 10; the third parallel flow channel 11.13 is cross-connected with the third vertical flow channel 11.7 and is connected to the right oil port of the hydraulic pump 2; the fourth parallel flow channel 11.14 is cross-connected with the first vertical flow channel 11.5 and is connected to the left oil port of the hydraulic pump 2; the fifth parallel flow channel 11.15 is a process hole, cross-connected with the third horizontal flow channel 11.3 and the fourth horizontal flow channel 11.4, and is sealed by a screw plug.

[0051] The oil circuit diagram of the electro-hydraulic actuator for a wood fence with an external drive function provided in an embodiment of the present invention when the piston rod is extended is as follows: Fig.10As shown: the double-shaft motor 1 rotates clockwise, the left side of the hydraulic pump 2 is the high-pressure oil discharge port, and the oil enters the large chamber of the hydraulic cylinder 9 through the left hydraulic control check valve and the check valve 3 8 in the two-way hydraulic lock 6. At the same time, the high-pressure oil enters the right control chamber of the two-way hydraulic lock 6, and the check valve on the right side of the hydraulic lock 6 is opened. The small chamber circuit of the hydraulic cylinder is connected, and the high-pressure oil pushes the piston rod to extend. The low-pressure oil in the large chamber of the cylinder enters the right suction port of the hydraulic pump 2. Since the hydraulic cylinder 9 is an asymmetric cylinder, the low-pressure oil discharged from the small chamber is less than the oil inlet of the large chamber. The oil tank 10 can replenish oil to the right suction port of the hydraulic pump through the check valve 1 3.1. When the pressure of the left high-pressure circuit reaches the pressure set by the overflow valve 2 4.2, part of the high-pressure oil on the left overflows and returns to the oil through the overflow valve 5.2. When there is an overload in the extension action, the external force will push the cylinder to extend and accelerate the action. Due to the throttling effect of the hydraulic damping 1 7.1, a certain pressure will be formed in the small chamber of the cylinder to balance the overload and prevent the action from stalling.

[0052] The oil circuit diagram of the electric hydraulic actuator for a wood fence with an external drive function provided by the embodiment of the present invention when the piston rod of the hydraulic cylinder is extended to the full position is as follows: Fig.11 As shown: the double-output shaft motor 1 continues to rotate clockwise, and the left side of the hydraulic pump 2 is the high-pressure oil discharge port. Since the hydraulic cylinder 9 has been extended into place, the high-pressure oil no longer enters the large chamber of the cylinder, and directly overflows and returns the oil through the overflow valve 2 4.2. The system pressure is the set pressure of the overflow valve 4.2, and there is no return oil discharged from the small chamber of the cylinder. The right side of the hydraulic pump 2 sucks oil from the oil tank 10 through the one-way valve 1 3.1.

[0053] The oil circuit diagram of an electro-hydraulic actuator for a wood fence with an external drive function provided by an embodiment of the present invention when the piston rod is retracted is as follows: Fig.12 As shown: the double-shaft motor 1 rotates counterclockwise, the right side of the hydraulic pump 2 is the high-pressure oil discharge port, and the oil enters the small chamber of the hydraulic cylinder 9 through the right hydraulic control check valve and hydraulic damping 7.1 in the two-way hydraulic lock 6. At the same time, the high-pressure oil enters the left control chamber of the two-way hydraulic lock 6, and the one-way valve on the left side of the hydraulic lock 6 is opened. The large chamber circuit of the hydraulic cylinder is connected, and the high-pressure oil pushes the piston rod to retract. The low-pressure oil in the large chamber of the cylinder enters the left suction port of the hydraulic pump 2. Since the hydraulic cylinder 9 is an asymmetric cylinder, the low-pressure oil discharged from the large chamber is more than the oil inlet of the small chamber, and the oil suction of the hydraulic pump is greater than the oil discharge. At this time, regardless of the load size, part of the oil at the high-pressure port of the hydraulic pump will overflow through the overflow valve 4.1, thereby reducing the oil entering the small chamber of the cylinder, ensuring that the oil return volume of the large chamber of the cylinder is consistent with the oil discharge volume of the pump port. The retraction action generally has an overload, and the gravity of the railing will push the cylinder to extend and retract. Due to the throttling effect of the hydraulic damping 7.2, a certain pressure will be formed in the large chamber of the cylinder to balance the overload.

[0054] The oil circuit diagram of the electric hydraulic actuator for a wood fence with an external drive function provided by the embodiment of the present invention when the piston rod of the hydraulic cylinder is retracted into position is as follows: Fig.13As shown: the double-output shaft motor 1 continues to rotate counterclockwise, and the right side of the hydraulic pump 2 is the high-pressure oil discharge port. Since the hydraulic cylinder 9 has retracted into place, the high-pressure oil no longer enters the small chamber of the cylinder, and directly overflows and returns the oil through the overflow valve 4.1. The system pressure is the set pressure of the overflow valve 4.1, and there is no return oil discharged from the large chamber of the cylinder. The left suction port of the hydraulic pump 2 draws oil from the oil tank 10 through the one-way valve 3.2.

[0055] When the actuator stops suddenly, the swing inertia of the external railing will cause the pressure in the two chambers of the cylinder to fluctuate alternately. The damping effect of hydraulic damper 1 7.1 and hydraulic damper 2 7.2 can quickly eliminate the fluctuation, stabilize the pressure in the two chambers, and ensure stability when stopping.

[0056] When the motor stops rotating due to power failure or fault, the motor tail end output shaft can be clamped by an electric gun (or hand-cranked device), and the external drive motor can rotate to achieve the above-mentioned actuator extension and retraction actions.

[0057] Those skilled in the art can understand that the above are only preferred examples of the invention and are not intended to limit the invention. Although the invention is described in detail with reference to the above examples, those skilled in the art can still modify the technical solutions recorded in the above examples or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. An electro-hydraulic actuator for a wood fence with an external drive function, characterized in that: It comprises a double-output shaft motor (1), a bidirectional hydraulic pump (2), a check valve 1 (3.1), a check valve 2 (3.2), a manually adjustable overflow valve 1 (4.1), a manually adjustable overflow valve 2 (4.2), a pressure measuring joint 1 (5.1), a pressure measuring joint 2 (5.2), a bidirectional hydraulic lock (6), a hydraulic damper 1 (7.1), a hydraulic damper 2 (7.2), a check valve 3 (8), a hydraulic cylinder (9), an oil tank (10), a hydraulic valve block (11), a hydraulic steel pipe (14), an oil cylinder valve block (15), a pressure regulating screw plug 1 (16.1), a pressure regulating screw plug 2 (16.2), a pressure regulating throat plug 1 (17.1) and a pressure regulating throat plug 2 (17.2); The double-output shaft motor (1) drives the bidirectional hydraulic pump (2) to rotate, the forward port of the one-way valve (3.1) is connected to the oil tank (10), and the reverse port of the one-way valve (3.1) is connected to the left oil port of the bidirectional hydraulic pump (2); the forward port of the one-way valve (3.2) is connected to the oil tank (10), and the reverse port of the one-way valve (3.2) is connected to the right oil port of the bidirectional hydraulic pump (2); the inlet of the manual relief valve (4.2) is connected to the left oil port of the bidirectional hydraulic pump (2), and the outlet is connected to the oil tank (1); the inlet of the manual relief valve (4.1) is connected to the right oil port of the bidirectional hydraulic pump (2), and the outlet is connected to the oil tank (1); the bidirectional hydraulic lock (6) is connected to the left and right sides of the bidirectional hydraulic pump (2). The oil port and the two chambers of the hydraulic cylinder (9) are connected to achieve the position locking of the hydraulic cylinder (9); the second pressure measuring joint (5.2) is installed between the left one-way valve of the two-way hydraulic lock (6) and the left oil port of the two-way hydraulic pump (2), and the first pressure measuring joint (5.1) is installed between the right one-way valve of the two-way hydraulic lock (6) and the right oil port of the two-way hydraulic pump (2); the second hydraulic damper (7.2) and the third one-way valve (8) are connected in parallel, one end of both is connected to the left one-way valve of the two-way hydraulic lock (6), and the other end of both is connected to the large chamber of the hydraulic cylinder (9); one end of the first hydraulic damper (7.1) is connected to the right one-way valve of the two-way hydraulic lock (6), and the other end is connected to the small chamber of the hydraulic cylinder (9).

2. The electro-hydraulic actuator for a wood fence with an external drive function according to claim 1, characterized in that: The automatic control process of the oil circuit when the piston rod of the hydraulic oil cylinder (9) extends is as follows: the double-output shaft motor (1) rotates clockwise, the left side of the hydraulic pump (2) is the high-pressure oil discharge port, and the oil enters the large chamber of the hydraulic oil cylinder (9) through the left hydraulic control one-way valve and the one-way valve three (8) in the two-way hydraulic lock (6). At the same time, the high-pressure oil enters the right control chamber of the two-way hydraulic lock (6), opens the one-way valve on the right side of the hydraulic lock (6), and the small chamber circuit of the hydraulic oil cylinder (9) is connected, and the high-pressure oil enters the small chamber circuit of the two-way hydraulic lock (6). The pressurized oil pushes the piston rod to extend, and the low-pressure oil in the large chamber of the hydraulic oil cylinder (9) enters the right oil suction port of the hydraulic pump (2). Since the hydraulic oil cylinder (9) is an asymmetric cylinder, the low-pressure oil discharged from the small chamber is less than the oil intake of the large chamber, and the oil tank (10) replenishes oil to the right oil suction port of the hydraulic pump (2) through the one-way valve (3.1); when the pressure of the left high-pressure circuit reaches the pressure set by the overflow valve (4.2), a part of the left high-pressure oil overflows back through the overflow valve (5.2).

3. The electro-hydraulic actuator for a wood fence with an external drive function according to claim 2, characterized in that: The automatic control process of the oil circuit when the piston rod of the hydraulic oil cylinder (9) is extended to the right position is as follows: the double-shaft motor (1) continues to rotate clockwise. Since the hydraulic oil cylinder (9) has been extended to the right position, the high-pressure oil no longer enters the large chamber of the hydraulic oil cylinder (9), and directly overflows and returns the oil through the overflow valve 2 (4.2). No return oil is discharged from the small chamber of the hydraulic oil cylinder (9), and the right oil suction port of the hydraulic pump (2) sucks oil from the oil tank (10) through the one-way valve 1 (3.1).

4. The electro-hydraulic actuator for a wood fence with an external drive function according to claim 3, characterized in that: The automatic control process of the oil circuit when the piston rod of the hydraulic oil cylinder (9) retracts is as follows: the double-output shaft motor (1) rotates counterclockwise, the right side of the hydraulic pump (2) is a high-pressure oil discharge port, and the oil enters the small chamber of the hydraulic oil cylinder (9) through the right hydraulic control one-way valve in the two-way hydraulic lock (6) and the hydraulic damper (7.1), and at the same time, the high-pressure oil enters the left control chamber of the two-way hydraulic lock (6), opens the left one-way valve of the two-way hydraulic lock (6), and the large chamber circuit of the hydraulic oil cylinder (9) is connected, and the high-pressure oil pushes the piston rod to retract. , the low-pressure oil in the large chamber of the hydraulic cylinder (9) enters the left suction port of the hydraulic pump (2); because the hydraulic cylinder (9) is an asymmetric cylinder, the low-pressure oil discharged from the large chamber is greater than the oil intake of the small chamber, that is, the oil intake of the hydraulic pump (2) is greater than the oil discharge. At this time, regardless of the load size, a part of the oil at the high-pressure port of the hydraulic pump (2) will overflow through the overflow valve 1 (4.1), thereby reducing the oil entering the small chamber of the hydraulic cylinder (9), ensuring that the return oil volume of the large chamber of the hydraulic cylinder (9) is consistent with the oil discharge volume of the pump port.

5. The electro-hydraulic actuator for a wood fence with an external drive function according to claim 4, characterized in that: The automatic control process of the oil circuit when the piston rod of the hydraulic cylinder (9) is retracted is as follows: the double-shaft motor (1) continues to rotate counterclockwise. Since the hydraulic cylinder (9) has been retracted, the high-pressure oil no longer enters the small chamber of the hydraulic cylinder (9), and directly overflows and returns the oil through the overflow valve 1 (4.1). No return oil is discharged from the large chamber of the hydraulic cylinder (9), and the left oil suction port of the hydraulic pump (2) sucks oil from the oil tank (10) through the one-way valve 2 (3.2).

6. The electro-hydraulic actuator for a wood fence with an external drive function according to claim 1, characterized in that: The double-shaft motor (1) is a DC motor, and has protruding shafts on both the front and rear end faces; the flange surface of the double-shaft motor (1) is fitted and fixed to the front end face of the hydraulic valve block (11), and the protruding shaft in the direction of the mounting flange end face passes through the hydraulic valve block (11) and is directly connected to the bidirectional hydraulic pump (2), and the two sides of the bottom end of the tail protruding shaft are flat; the bidirectional hydraulic pump (2) is fixed to the rear end circular surface of the hydraulic valve block (11), and the two oil ports of the bidirectional hydraulic pump (2) are connected to the oil ports on the hydraulic valve block (11). The oil tank (10) is fitted with the rear rectangular surface of the hydraulic valve block (11), and a radial O-ring is used to seal the cylindrical surface of the hydraulic valve block (11); the cylinder barrel of the hydraulic oil cylinder (9) is fixedly connected to the hydraulic steel pipe (14) and the oil cylinder valve block (15); the upper end surface of the oil cylinder valve block (15) is fixed to the lower end surface of the hydraulic valve block (11) and is sealed with an O-ring; the two chambers of the hydraulic oil cylinder (9) are connected through the hydraulic steel pipe (14) and the oil cylinder valve block (15).

7. The electro-hydraulic actuator for a wood fence with an external drive function according to claim 6, characterized in that: The one-way valve 1 (3.1) and the one-way valve 2 (3.2) are installed on the two-way hydraulic pump (2).

8. The electro-hydraulic actuator for a wood fence with an external drive function according to claim 7, characterized in that: The hydraulic valve block (11) is provided with a first horizontal flow channel (11.1) that is connected and a fourth horizontal flow channel (11.4) that is not connected on the right side surface, a second horizontal flow channel (11.2) and a third horizontal flow channel (11.3) that are connected to the left and right sides are provided on the left side surface, a first vertical flow channel (11.5), a second vertical flow channel (11.6) and a third vertical flow channel (11.7) are provided on the upper end surface, a fourth vertical flow channel (11.8), a fifth vertical flow channel (11.9) and a sixth vertical flow channel (11.10) are provided on the lower end surface, and a first parallel flow channel (11.11), a second parallel flow channel (11.12), a third parallel flow channel (11.13), a fourth parallel flow channel (11.14) and a fifth parallel flow channel (11.15) are provided on the cylindrical surface at the front end; The bidirectional hydraulic lock (6) and the one-way valve (8) are respectively screwed into the third horizontal flow channel (11.3) from both ends of the third horizontal flow channel (11.3) through threads; The hydraulic damper 1 (7.1) and the hydraulic damper 2 (7.2) are both external threaded structures, with hexagonal grooves on the end faces and relatively fine oil holes inside. The hydraulic damper 1 (7.1) is screwed into the fourth vertical flow channel (11.8) through threads, and the hydraulic damper 2 (7.2) is screwed into the fifth vertical flow channel (11.9) through threads; the pressure measuring joint (5.2) and the manual relief valve 1 (4.1) are respectively installed in the second horizontal flow channel (11.2) from both ends of the second horizontal flow channel (11.2); the pressure regulating throat plug 1 (17.1) is screwed into the second horizontal flow channel (11.2) through threads, pressing the manual relief valve 1 (4.1) clockwise, and the outermost end seals the oil return port of the manual relief valve 1 (4.1) through the pressure regulating screw plug 1 (16.1); The second manual relief valve (4.2) and the first pressure measuring joint (5.1) are respectively installed in the first horizontal flow channel (11.1) from both ends of the first horizontal flow channel (11.1). The structure and installation method of the second manual relief valve (4.2) are the same as those of the first manual relief valve (4.1), but the second manual relief valve (4.2) and the first manual relief valve (4.1) are located on different sides of the hydraulic valve block (11). The ends of the second manual relief valve (4.2) are pressed and sealed by the second pressure regulating throat plug (17.2) and the second pressure regulating screw plug (16.2) in sequence. The bidirectional hydraulic lock (6) and the one-way valve (8) are respectively installed in the third horizontal flow channel (11.3) from both ends of the third horizontal flow channel (11.3); the fourth horizontal flow channel (11.4) is a process hole, cross-connected with the first vertical flow channel (11.5) and the fifth parallel flow channel (11.15), and sealed by a screw plug; the first vertical flow channel (11.5) is a process hole, cross-connected with the first horizontal flow channel (11.1), the fourth horizontal flow channel (11.4), and the fourth parallel flow channel (11.14), and sealed by a screw plug; the second vertical flow channel (11.6) is a process hole, cross-connected with the first horizontal flow channel (11.1), and sealed by a screw plug; the third vertical flow channel 11.7 is a process hole, cross-connected with the second horizontal flow channel 11.2 and the third parallel flow channel 11.13, and sealed by a screw plug; The hydraulic damper (7.1) is installed in the fourth vertical flow channel (11.8), the fourth vertical flow channel (11.8) is cross-connected with the third horizontal flow channel (11.3), and is connected to the small cavity of the hydraulic oil cylinder (9); the hydraulic damper (7.2) is installed in the fifth vertical flow channel (11.9), the fifth vertical flow channel (11.9) is cross-connected with the third horizontal flow channel (11.3), and is connected to the large cavity of the hydraulic oil cylinder (9); the sixth vertical flow channel (11.10) is cross-connected with the third horizontal flow channel (11.3), and is connected to the large cavity of the hydraulic oil cylinder (9); the first parallel flow channel (11.11) is connected to the second vertical flow channel (11.6) is cross-connected and connected to the oil tank (10); the second parallel flow channel (11.12) is cross-connected with the second horizontal flow channel (11.2) and connected to the oil tank (10); the third parallel flow channel (11.13) is cross-connected with the third vertical flow channel (11.7) and connected to the right oil port of the hydraulic pump (2); the fourth parallel flow channel (11.14) is cross-connected with the first vertical flow channel (11.5) and connected to the left oil port of the hydraulic pump (2); the fifth parallel flow channel (11.15) is a process hole, cross-connected with the third horizontal flow channel (11.3) and the fourth horizontal flow channel (11.4), and sealed by a screw plug.

9. The electro-hydraulic actuator for a wood fence with an external drive function according to claim 8, characterized in that: The manual relief valve 1 (4.1) comprises a steel ball base (4.1.1), a steel ball (4.1.2), a spring base (4.1.3) and a pressure regulating spring ( 4.1.4), wherein the steel ball base (4.1.1) is installed in the step hole of the second horizontal flow channel (11.2) of the hydraulic valve block (11), using interference fit, and the steel ball (4.1.2), the spring base (4.1.3), and the pressure regulating spring (4.1.4) are installed in sequence.

10. The electro-hydraulic actuator for a wood fence with an external drive function according to claim 9, characterized in that: The hydraulic cylinder (9) is a single-rod piston cylinder, the rear end of the extension rod is provided with an external thread and can be fixed to the peripheral mechanism via a nut, and the cylinder barrel can be fixed to the peripheral mechanism via two bolts.

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