Servo electro-hydraulic pressure cylinder

Abstract

The utility model discloses a servo electro-hydraulic pressure cylinder. The servo electro-hydraulic pressure cylinder comprises a hydraulic cylinder, a first servo electric cylinder and a pressure boosting device, the hydraulic cylinder comprises a cylinder body, a piston rod defining a control cavity with the cylinder body and a control channel communicated with the control cavity, and the second end of the piston rod is connected with the output end of the first servo electric cylinder in an assembled mode. The supercharging device comprises a device body, a butt joint channel, a supercharging cavity, a middle channel, a liquid storage cavity and a second servo electric cylinder, wherein the output end of the second servo electric cylinder is at least provided with an initial position and an end position in the telescopic sliding process. When the output end of the second servo electric cylinder is located at the initial position, communication between the pressurizing cavity and the middle channel is opened, and when the output end of the second servo electric cylinder is switched to the ending position from the initial position, communication between the pressurizing cavity and the middle channel is closed, and the output end slides in the pressurizing cavity. And the working medium in the pressurizing cavity is finally extruded into the control cavity. The servo electro-hydraulic pressure cylinder has the advantages of being stable and accurate in pressure boosting, simplifying the types of power sources and saving energy.

Description

Technical Field

[0001] The utility model relates to a booster cylinder, in particular to a servo electro-hydraulic booster cylinder which can be applied to mold clamping occasions but is not limited thereto. Background Art

[0002] As is known to all, in a pulp forming machine, there are processes involved such as wet blank forming, hot pressing and shaping the wet blank to form a dry blank, and trimming the dry blank to form a primary product.

[0003] Among them, in the process of wet blank forming and wet blank hot pressing, the use of booster cylinder is indispensable. The booster cylinder serves as the power source for opening and closing the mold, and provides pressure and pressure holding for the molded workpiece.

[0004] However, in the composite booster cylinder disclosed in Chinese Patent Application No. 202221102710.1, its boost is achieved by the auxiliary piston cylinder; and because the working power of the auxiliary piston cylinder comes from the air source, and the air pressure in the air source is prone to fluctuations, the boost of the auxiliary piston cylinder has the defects of poor stability and low precision. In addition, since the power of the main piston cylinder in the composite booster cylinder comes from the drive motor, and the working power of the auxiliary piston cylinder comes from the air source, the composite booster cylinder disclosed in Chinese Patent Application No. 202221102710.1 requires many types of power sources; in addition, the air source as a power source has the defect of not being energy-efficient.

[0005] Of course, the compound booster cylinder used as a power source in other fields also has the above-mentioned defects.

[0006] Therefore, it is necessary to provide a servo electro-hydraulic booster cylinder that has stable and accurate boosting, simplified power source types, and energy saving to overcome the above-mentioned defects. Utility Model Content

[0007] The utility model aims to provide a servo electro-hydraulic booster cylinder which has stable and accurate boosting, simplified power source types and energy saving.

[0008] In order to achieve the above-mentioned purpose, the servo electro-hydraulic booster cylinder of the utility model comprises a hydraulic cylinder, a first servo electric cylinder and a booster device for boosting the hydraulic cylinder. The hydraulic cylinder comprises a cylinder body, a piston rod that can be telescopically slidable in the cylinder body and defines a control chamber with the cylinder body, and a control channel opened in the cylinder body and connected to the control chamber. The first end of the piston rod is exposed to the outside from the first end of the cylinder body, and the second end of the piston rod opposite to the piston rod is exposed to the outside from the second end of the cylinder body and assembled and connected to the output end of the first servo electric cylinder. The booster device comprises a device body, a docking channel dockingly connected to the control channel, a booster chamber connected to the docking channel, an intermediate channel connected to the booster chamber, a liquid storage chamber for storing working medium connected to the intermediate channel, and a second servo electric cylinder whose output end has at least one initial position and one terminal position during the telescopic sliding process. The output end of the second servo electric cylinder opens the connection between the boost chamber and the intermediate channel when it is at the initial position, and the output end of the second servo electric cylinder closes the connection between the boost chamber and the intermediate channel and slides in the boost chamber during the process of switching from the initial position to the terminal position, so as to finally squeeze the working medium in the boost chamber into the control chamber.

[0009] Compared with the prior art, the pressure on the piston rod is increased by squeezing the working medium in the boosting chamber with the help of the second servo electric cylinder, and the second servo electric cylinder has the advantages of stable and precise stepping, so that the pressure on the piston rod is stable and precise; at the same time, since the second servo electric cylinder and the first servo electric cylinder use electrical energy uniformly, the type of power source required by the servo electro-hydraulic booster cylinder of the utility model is simplified, and the servo electro-hydraulic booster cylinder of the utility model also has the advantage of energy saving.

[0010] Preferably, the device body includes a first body and a second body, the boost chamber, the intermediate channel and the docking channel are opened on the first body, the liquid storage chamber is opened on the second body, and the second servo electric cylinder is assembled and connected to the first body.

[0011] Preferably, the first body includes an end head and a protrusion extending in the direction in which the output end of the second servo electric cylinder extends into the boosting chamber and protruding from the end head, the boosting chamber is opened on the end head and the protrusion, and one end of the boosting chamber is adjacent to an end of the protrusion away from the end head, and the other end of the boosting chamber opposite to the end head passes through the end head, and the intermediate channel and the docking channel are opened on the end head.

[0012] Preferably, a first sealing ring and a second sealing ring are embedded on the side cavity wall of the boosting cavity, which are separated from each other along the direction in which the output end of the second servo electric cylinder extends into the boosting cavity and are used to cooperate with the sliding sleeve of the output end, and the intermediate channel is located between the first sealing ring and the second sealing ring; the output end of the second servo electric cylinder slides out of the second sealing ring and is inserted into the first sealing ring when in the initial position, and the output end of the second servo electric cylinder is also inserted into the second sealing ring when in the terminal position.

[0013] Preferably, the second body is a cylinder assembled on the end head and surrounding the protrusion, so that the protrusion is located in the liquid storage cavity.

[0014] Preferably, the second body and the first servo electric cylinder are arranged side by side, and the protrusion is located outside the liquid storage cavity of the second body.

[0015] Preferably, the first body, the cylinder body of the hydraulic cylinder and the second body are fixed together, and the first servo electric cylinder is located between the first body and the second body.

[0016] Preferably, the second body is a liquid storage container.

[0017] Preferably, the first servo electric cylinder and the second servo electric cylinder are arranged side by side, or the second servo electric cylinder and the hydraulic cylinder are arranged side by side.

[0018] Preferably, the servo motor in the first servo electric cylinder is arranged side by side or connected to the lead screw in a straight line, and the output end of the first servo electric cylinder is fixedly connected to the sliding sleeve in the first servo electric cylinder and the nut on the lead screw.

[0019] Preferably, the servo motor in the second servo electric cylinder is arranged side by side or linearly connected with the lead screw, and the output end of the second servo electric cylinder and the sliding sleeve in the second servo electric cylinder are fixedly connected to the nut on the lead screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the servo electro-hydraulic booster cylinder of the first embodiment of the utility model when the piston rod and the output end of the second servo electric cylinder are in the initial position.

[0021] Figure 2 yes Figure 1 A plan view of the servo hydraulic booster cylinder in the shown state.

[0022] Figure 3This is an internal view of the servo hydraulic booster cylinder of the first embodiment of the utility model, which is cut through a plane through the center line of the piston rod and the output end of the second servo electric cylinder. The internal view only shows that the hydraulic cylinder and the device body are cut, and the piston rod is in the end position and the output end of the second servo electric cylinder is in the initial position.

[0023] Figure 4 It is an internal diagram showing the coordination of the lead screw, the nut and the output end in the first servo cylinder.

[0024] Figure 5 It is an internal diagram showing the coordination of the lead screw, nut and output end in the second servo cylinder.

[0025] Figure 6a The diagram shows the state of the servo electro-hydraulic booster cylinder of the first embodiment of the utility model when applying pressure to a workpiece.

[0026] Figure 6b yes Figure 6a The state diagram of the servo electro-hydraulic booster cylinder in the state shown when pressurizing the workpiece.

[0027] Figure 6c yes Figure 6b The servo hydraulic booster cylinder in the state shown is switched to the initial position at the output end of the second servo electric cylinder.

[0028] Figure 6d yes Figure 6c The servo electro-hydraulic booster cylinder in the state shown is a state diagram when the output end of the first servo electric cylinder drives the piston rod to switch to the initial position.

[0029] Figure 7 It is a plan view of the servo electro-hydraulic booster cylinder of the second embodiment of the utility model when the piston rod and the output end of the second servo electric cylinder are in the initial position.

[0030] Figure 8 It is a plan view of the servo electro-hydraulic booster cylinder of the third embodiment of the utility model when the piston rod and the output end of the second servo electric cylinder are in the initial position.

[0031] Fig. 9 This is an internal view of the servo hydraulic booster cylinder of the third embodiment of the utility model, which is cut through a plane through the center line of the piston rod and the output end of the second servo electric cylinder. The internal view only shows that the hydraulic cylinder and the device body are cut, and the piston rod and the output end of the second servo electric cylinder are both in the end position.

[0032] Fig.10 It is a plan view of the servo electro-hydraulic booster cylinder of the fourth embodiment of the utility model when the piston rod and the output end of the second servo electric cylinder are in the initial position. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present utility model are described below in conjunction with the accompanying drawings.

[0034] See also Figures 1 to 3 The servo electro-hydraulic booster cylinder 100 a of the first embodiment includes a hydraulic cylinder 10 , a first servo electric cylinder 20 , and a booster device 30 for boosting the hydraulic cylinder 10 .

[0035] The hydraulic cylinder 10 includes a cylinder body 11, a piston rod 12 that can be extended and slid in the cylinder body 11 and defines a control chamber 13 with the cylinder body 11, and a control channel 14 that is opened in the cylinder body 11 and communicates with the control chamber 13. The first end 12a of the piston rod 12 is exposed from the first end 11a of the cylinder body 11 to meet the needs of the piston rod 12 extending or retracting into the cylinder body 11; the second end 12b of the piston rod 12 is exposed from the second end 11b of the cylinder body 11 to meet the needs of assembling the second end 12b and the output end 21 of the first servo electric cylinder 20; optionally, Figure 3 As an example, the control channel 14 is opened at the second end 11b; obviously, according to actual needs, the control channel 14 can also be opened at other positions of the cylinder body 11, as long as the working medium 50 (see Figure 6a ) can drive the piston rod 12 to slide in a direction away from the first servo cylinder 20, so Figure 3 Limits shown.

[0036] At the same time, the booster device 30 includes a device body 31, a docking channel 32 connected to the control channel 14, a booster chamber 33 connected to the docking channel 32, an intermediate channel 34 connected to the booster chamber 33, a liquid storage chamber 35 connected to the intermediate channel 34 for storing the working medium 50, and an output end 21 that has at least one initial position during the telescopic sliding process (see Figure 3 , Figure 6a or Figure 6c shown) and an end position (see Figure 6b The output end 361 of the second servo electric cylinder 36 opens the communication between the boosting chamber 33 and the intermediate channel 34 when in the initial position, so as to meet the need for the working medium 50 in the liquid storage chamber 35 to flow along the intermediate channel 34 to the boosting chamber 33, the docking channel 32, the control channel 14 and the control chamber 13. Figure 3 , Figure 6a or Figure 6cThe output end 361 of the second servo electric cylinder 36 closes the connection between the boosting chamber 33 and the intermediate channel 34 during the process of switching from the initial position to the final position and slides in the boosting chamber 33 to finally squeeze the working medium 50 in the boosting chamber 33 to the control chamber 13, thereby achieving the purpose of boosting the piston rod 12, thereby satisfying the purpose of the piston rod 12 applying force to the workpiece 200. Figure 6b More specifically, as follows:

[0037] like Figures 1 to 3 As shown, as an example, the device body 31 includes a first body 31a and a second body 31b. The boost chamber 33, the intermediate channel 34 and the docking channel 32 are opened on the first body 31a, the liquid storage chamber 35 is opened on the second body 31b, and the second servo electric cylinder 36 is assembled and connected with the first body 31a; such a design can make the first body 31a and the second body 31b into relatively independent or non-independent structures, wherein the servo electric hydraulic boost cylinder 100a of the first embodiment and the servo electric hydraulic boost cylinder 100b of the second embodiment are both non-independent structures, and the state is shown in FIG. Figure 1 and Figure 7 As shown, the servo hydraulic booster cylinder 100c (100d) of the third to fourth embodiments are each an independent structure, and the state is shown in FIG. Figure 8 and Fig.10 Specifically, Figures 1 to 3 As an example, the first body 31a includes an end 311 and a protrusion 312 extending along the direction in which the output end 361 of the second servo electric cylinder 36 extends into the boosting chamber 33 (i.e., the direction indicated by arrow A) and protruding from the end 311. The boosting chamber 33 is opened on the end 311 and the protrusion 312, and one end of the boosting chamber 33 is adjacent to the end of the protrusion 312 away from the end 311, and the other end of the boosting chamber 33 passes through the end 312 to facilitate the output end 361 of the second servo electric cylinder 36 to be fitted into the boosting chamber 33; the intermediate channel 34 and the docking channel 32 are opened on the end 311 to facilitate the communication arrangement of the boosting chamber 33 with the intermediate channel 34 and the docking channel 32 respectively. More specifically, in Figure 3 As an example, the side cavity wall 333 of the boosting cavity 33 is embedded with a first sealing ring 37 and a second sealing ring 38 which are separated from each other along the direction in which the output end 361 of the second servo electric cylinder 36 extends into the boosting cavity 33 and are used to cooperate with the output end 361 sliding sleeve. The intermediate channel 34 is located between the first sealing ring 37 and the second sealing ring 38 to meet the requirement that the output end 361 of the second servo electric cylinder 36 is in the initial position so that the intermediate channel 34 and the boosting cavity 33 are connected (see the state Figure 3 , Figure 6a or Figure 6c As shown), and the output end 361 of the second servo electric cylinder 36 closes the communication between the intermediate channel 34 and the boost chamber 33 at the end position (status see Figure 6b Obviously, according to actual needs, the first sealing ring 38 and the second sealing ring 38 may also be nested at the output end 361 of the second servo cylinder 36, so it is not necessary to Figure 3 Limits shown.

[0038] like Figure 3 As shown, as an example, the output end 361 of the second servo electric cylinder 36 slides out of the second sealing ring 38 and is inserted into the first sealing ring 37 at the initial position; the output end 361 of the second servo electric cylinder 36 is still inserted into the second sealing ring 38 at the terminal position. Figure 6b As shown, the output end 361 of the second servo electric cylinder 36, the first sealing ring 37 and the second sealing ring 38 cooperate to realize the on-off control of the boosting chamber 33 and the intermediate channel 34 by the output end 361. In addition, the second body 31b is a cylinder assembled on the end 311 and surrounding the protruding body 312, so that the protruding body 312 is located in the liquid storage chamber 34; this design can reduce the space occupied by the device body 31.

[0039] like Figures 1 to 3 As shown, as an example, the second servo electric cylinder 36 is arranged side by side with the hydraulic cylinder 10, so that the second servo electric cylinder 36 is arranged in an inverted manner, so that the servo electric hydraulic booster cylinder 100a of the first embodiment can be made shorter in the direction indicated by arrow A. In addition, the servo motor 22 and the lead screw 23 in the first servo electric cylinder 20 are arranged side by side, so that the first servo electric cylinder 20 adopts an associated arrangement, thereby effectively reducing the space occupied by the first servo electric cylinder 20 in the direction indicated by arrow A; and the output end 21 of the first servo electric cylinder 20 is fixedly connected to the nut 24 on the lead screw 23 of the first servo electric cylinder 20, and the state is shown in FIG. Figure 5 As shown in FIG. 6 , the screw 23 drives the nut 24 and the output end 21 to slide along the screw 23 during the rotation process. In addition, the servo motor 362 and the screw 363 in the second servo electric cylinder 36 are arranged side by side, so that the second servo electric cylinder 36 is arranged in parallel, thereby effectively reducing the space occupied by the second servo electric cylinder 36 in the direction indicated by the arrow A; and the output end 361 of the second servo electric cylinder 36 is fixedly connected to the nut 364 on the screw 363 with the sliding sleeve in the second servo electric cylinder 36, and the state is shown in FIG. 6 , so that the screw 363 drives the nut 364 and the output end 361 to slide along the screw 363 during the rotation process. It should be noted that, since the servo motor 22 and the lead screw 23 in the first servo electric cylinder 20 are arranged side by side, the servo motor 22 uses belt drive, chain drive or gear drive to drive the lead screw 23 to rotate; similarly, since the servo motor 362 and the lead screw 363 in the second servo electric cylinder 36 are arranged side by side, the servo motor 362 also uses belt drive, chain drive or gear drive to drive the lead screw 363 to rotate.

[0040] Combination Figures 6a to 6d , the working principle of the servo electro-hydraulic booster cylinder of the first embodiment is described:

[0041] First, the first servo electric cylinder 20 works, so that the output end 21 of the first servo electric cylinder 20 drives the piston rod 11 to slide toward the workpiece 200, until the piston rod 11 acts on the workpiece 200 and applies a preset force to the workpiece 200; and in the process of the output end 21 of the first servo electric cylinder 20 driving the piston rod 11 to slide toward the workpiece 200, the volume of the control chamber 13 increases, so the working medium 50 in the liquid storage chamber 34 will be continuously replenished into the control chamber 13, and the state is shown in FIG. Figure 6a shown.

[0042] Next, the second servo electric cylinder 36 works, so that the output end 361 of the second servo electric cylinder 36 slides from the initial position to the final position along the direction indicated by the arrow A; and in the process of the output end 361 sliding from the initial position to the final position, the output end 361 of the second servo electric cylinder 36 closes the connection between the intermediate channel 34 and the boosting chamber 33, and squeezes the working medium 50 in the boosting chamber 33, so that the squeezed working medium 50 is pressed into the control chamber 13 along the docking channel 32 and the control channel 14, thereby achieving the purpose of boosting the piston rod 11, thereby achieving the force boosting of the workpiece 200, and the state is shown in FIG. Figure 6b When the workpiece 200 has completed the force application and pressurization, the output end 361 of the second servo electric cylinder 36 slides from the end start position to the initial stop position; and in the process of the output end 361 of the second servo electric cylinder 36 sliding from the end start position to the initial stop position, the communication between the intermediate channel 34 and the pressurization chamber 33 is opened, so as to meet the need of the working medium 50 to flow to the liquid storage chamber 35. Figure 6c shown.

[0043] Then, the output end 21 of the first servo electric cylinder 20 drives the piston rod 12 to slide and reset away from the workpiece 200, so that the working medium 50 in the control chamber 13 flows back to the liquid storage chamber 35 due to the reduction of the volume of the control chamber 13, until the output end 21 of the first servo electric cylinder 20 drives the piston rod 12 to return to the initial position. Figure 6d shown.

[0044] Therefore, after the above process, a cycle of the servo electro-hydraulic booster cylinder 100 a of the first embodiment applying force and pressurizing the workpiece 200 is completed.

[0045] See also Figure 7 The structures of the servo hydraulic booster cylinder 100b of the second embodiment are substantially the same as those of the servo hydraulic booster cylinder 100a of the first embodiment, and the differences are as follows:

[0046] In the servo electro-hydraulic booster cylinder 100b of the second embodiment, the servo motor 22 in the first servo electric cylinder 20 is linearly connected to the lead screw 23, and the servo motor 362 in the second servo electric cylinder 36 is linearly connected to the lead screw 363, so that the first servo electric cylinder 20 and the second servo electric cylinder 36 are directly connected. Therefore, the use of belt drive, chain drive and gear drive can be reduced; because the servo motor 22 in the first servo electric cylinder 20 is linearly connected to the lead screw 23, and the servo motor 362 in the second servo electric cylinder 36 is linearly connected to the lead screw 363, the servo motor 22 (362) and the lead screw 23 (263) can be fixed together by a coupling or other components. In the servo electro-hydraulic booster cylinder 100a of the first embodiment, the servo motor 22 and the lead screw 23 in the first servo electric cylinder 20 are arranged side by side, and the servo motor 362 and the lead screw 363 in the second servo electric cylinder 36 are arranged side by side, so the servo motor 22 (362) and the lead screw 23 (263) need to be connected by belt drive, chain drive and gear drive.

[0047] Apart from the above differences, the other two are the same, so I will not go into details here.

[0048] See also Figure 8 and Fig. 9 The structures of the servo hydraulic booster cylinder 100c of the third embodiment and the servo hydraulic booster cylinder 100a of the first embodiment are basically the same, and the difference lies in the device body, which is as follows:

[0049] (a) In the servo hydraulic booster cylinder 100c of the third embodiment, the second body 31b' and the first servo electric cylinder 20 are arranged side by side, and the protrusion 312 is located outside the liquid storage chamber 34 of the second body 31b'; such a design facilitates the operator to check for internal leakage when the boost is abnormal, that is, by checking the protrusion 312 and the output end 31 of the second servo electric cylinder 36, the internal leakage can be found, so the operation of checking the internal leakage is very convenient; in addition, the first body 31a, the cylinder body 11 of the hydraulic cylinder 10 and the second body 31b' are fixed together, and the first servo electric cylinder 20 is located between the first body 31a and the second body 31b'; in addition, the second body 31b' is a liquid storage container. In the servo hydraulic booster cylinder 100a of the first embodiment, the second body 31b is a cylinder body assembled on the end 311 and surrounding the protrusion 312, so that the protrusion 312 is located in the liquid storage chamber 34.

[0050] (b) In the servo hydraulic booster cylinder 100c of the third embodiment, the second servo electric cylinder 36 is arranged side by side with the first servo electric cylinder 20, so that the second servo electric cylinder 36 is arranged in a normal arrangement. In the servo hydraulic booster cylinder 100a of the first embodiment, the second servo electric cylinder 36 is arranged side by side with the hydraulic cylinder 10, so that the second servo electric cylinder 36 is arranged in an inverted arrangement.

[0051] Except for the difference between (a) and (b), the other two are the same, so they will not be described here.

[0052] See also Fig.10 The structures of the servo electro-hydraulic booster cylinder 100c of the fourth embodiment and the servo electro-hydraulic booster cylinder 100c of the third embodiment are basically the same, and the differences are as follows:

[0053] In the servo electric hydraulic booster cylinder 100d of the fourth embodiment, the servo motor 22 in the first servo electric cylinder 20 is connected to the lead screw 23 in a straight line, and the servo motor 362 in the second servo electric cylinder 36 is connected to the lead screw 363 in a straight line, so the use of belt drive, chain drive and gear drive can be reduced; because the servo motor 22 in the first servo electric cylinder 20 is connected to the lead screw 23 in a straight line, and the servo motor 362 in the second servo electric cylinder 36 is connected to the lead screw 363 in a straight line, the servo motor 22 (362) and the lead screw 23 (263) can be fixed together by a coupling or other components. In the servo electric hydraulic booster cylinder 100c of the third embodiment, the servo motor 22 in the first servo electric cylinder 20 and the lead screw 23 are arranged side by side, and the servo motor 362 in the second servo electric cylinder 36 and the lead screw 363 are arranged side by side, so the servo motor 22 (362) and the lead screw 23 (263) need to be connected by belt drive, chain drive and gear drive.

[0054] Apart from the above differences, the other two are the same, so I will not go into details here.

[0055] In summary, in the servo electric hydraulic booster cylinder 100a of the first embodiment, the first servo electric cylinder 20 and the second servo electric cylinder 36 are arranged in parallel, and the second servo electric cylinder 36 is arranged in an inverted manner. In the servo electric hydraulic booster cylinder 100b of the second embodiment, the first servo electric cylinder 20 and the second servo electric cylinder 36 are arranged in direct connection, and the second servo electric cylinder 36 is arranged in an inverted manner. In the servo electric hydraulic booster cylinder 100c of the third embodiment, the first servo electric cylinder 20 and the second servo electric cylinder 36 are arranged in parallel, and the second servo electric cylinder 36 is arranged in a normal manner. In the servo electric hydraulic booster cylinder 100d of the fourth embodiment, the first servo electric cylinder 20 and the second servo electric cylinder 36 are arranged in direct connection, and the second servo electric cylinder 36 is arranged in a normal manner. In addition, since the first body 31a and the second body 31b' in the servo electro-hydraulic booster cylinder 100c (100d) of the third and fourth embodiments are separated by the first servo electric cylinder 20, the liquid storage chamber 34 in the second body 31b' is indirectly connected to the intermediate channel 34 on the end 311. For example, the connection between the liquid storage chamber 34 and the intermediate channel 34 can be achieved through a channel opened in the cylinder body 11. Obviously, the implementation method can be other, so it is not limited to this.

[0056] Compared with the prior art, the working medium 50 in the boosting chamber 33 is squeezed by the second servo electric cylinder 36 to increase the pressure on the piston rod 12. Combined with the advantages of stable and precise stepping of the second servo electric cylinder 36, the pressure increase of the piston rod 12 is stable and precise. At the same time, since the second servo electric cylinder 36 and the first servo electric cylinder 20 use a unified power supply, the types of power source requirements of the servo electro-hydraulic booster cylinder 100a (100b, 100c, 100d) of the utility model are simplified, and the servo electro-hydraulic booster cylinder 100a (100b, 100c, 100d) of the utility model has the advantage of energy saving.

[0057] The above disclosure is only a preferred example of the present invention, and its role is to facilitate the technical personnel in this field to understand and implement it. Of course, it cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A servo electro-hydraulic booster cylinder, comprising a hydraulic cylinder, a first servo electric cylinder and a booster device for boosting the hydraulic cylinder, wherein the hydraulic cylinder comprises a cylinder body, a piston rod which can be telescopically slidable in the cylinder body and defines a control chamber with the cylinder body, and a control channel which is opened in the cylinder body and connected with the control chamber, wherein the first end of the piston rod is exposed to the outside from the first end of the cylinder body, the second end of the piston rod which is opposite to the piston rod is exposed to the outside from the second end of the cylinder body and is assembled and connected with the output end of the first servo electric cylinder, the booster device comprises a device body, a docking channel which is connected to the control channel, a booster chamber connected to the docking channel, an intermediate channel connected to the booster chamber, and a liquid storage chamber for storing a working medium which is connected to the intermediate channel, wherein the docking channel, the booster chamber, the intermediate channel and the liquid storage chamber are opened on the device body, and characterized in that: The boosting device further includes a second servo electric cylinder, wherein the output end of the second servo electric cylinder has at least an initial position and an end position during the telescopic sliding process, wherein the output end of the second servo electric cylinder opens the connection between the boosting chamber and the intermediate channel when at the initial position, and closes the connection between the boosting chamber and the intermediate channel and slides in the boosting chamber during the process of switching from the initial position to the end position, so as to finally squeeze the working medium in the boosting chamber into the control chamber.

2. The servo electro-hydraulic booster cylinder according to claim 1, characterized in that: The device body comprises a first body and a second body, the boost chamber, the middle channel and the docking channel are arranged on the first body, the liquid storage chamber is arranged on the second body, and the second servo electric cylinder is assembled and connected with the first body.

3. The servo electro-hydraulic booster cylinder according to claim 2, characterized in that: The first body includes an end and a protrusion extending in the direction in which the output end of the second servo electric cylinder extends into the boosting chamber and protruding from the end, the boosting chamber is opened on the end and the protrusion, and one end of the boosting chamber is adjacent to an end of the protrusion away from the end, and the other end of the boosting chamber opposite to the end passes through the end, and the intermediate channel and the docking channel are opened on the end.

4. The servo electro-hydraulic booster cylinder according to claim 3, characterized in that: A first sealing ring and a second sealing ring are embedded on the side cavity wall of the boosting cavity, which are separated from each other along the direction in which the output end of the second servo electric cylinder extends into the boosting cavity and are used to cooperate with the sliding sleeve of the output end, and the intermediate channel is located between the first sealing ring and the second sealing ring; the output end of the second servo electric cylinder slides out of the second sealing ring and is inserted into the first sealing ring when in the initial position, and the output end of the second servo electric cylinder is also inserted into the second sealing ring when in the terminal position; the second body is a cylindrical body assembled on the end head and surrounding the protrusion, so that the protrusion is located in the liquid storage cavity.

5. The servo electro-hydraulic booster cylinder according to claim 3, characterized in that: The second body is arranged side by side with the first servo electric cylinder, and the protruding body is located outside the liquid storage cavity of the second body.

6. The servo electro-hydraulic booster cylinder according to claim 5, characterized in that: The first body, the cylinder body of the hydraulic cylinder and the second body are fixed together, and the first servo electric cylinder is located between the first body and the second body.

7. The servo electro-hydraulic booster cylinder according to claim 5, characterized in that: The second body is a liquid storage container.

8. The servo electro-hydraulic booster cylinder according to claim 2, characterized in that: The second servo electric cylinder is arranged side by side with the first servo electric cylinder, or the second servo electric cylinder is arranged side by side with the hydraulic cylinder.

9. The servo electro-hydraulic booster cylinder according to claim 1, characterized in that: The servo motor in the first servo electric cylinder is arranged side by side or connected to the lead screw in a straight line, and the output end of the first servo electric cylinder is fixedly connected to the sliding sleeve in the first servo electric cylinder and the nut on the lead screw.

10. The servo electro-hydraulic booster cylinder according to claim 1, characterized in that: The servo motor in the second servo electric cylinder is arranged side by side or connected to the lead screw in a straight line, and the output end of the second servo electric cylinder is fixedly connected to the sliding sleeve in the second servo electric cylinder and the nut on the lead screw.

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