Piston-type hydraulic cylinders and hot presses

Abstract

This application relates to a plunger-type hydraulic cylinder and a hot press. The plunger-type hydraulic cylinder includes: a cylinder body with a closed end and an open end at its axial ends, and an exhaust channel communicating with the interior of the cylinder body; a plunger rod axially movable within the cylinder body, with one end of the plunger rod extending from the open end of the cylinder body; a sealing ring disposed between the plunger rod and the cylinder body, and located between the exhaust channel and the open end of the cylinder body; an exhaust pipe located outside the cylinder body, with one end communicating with the exhaust channel, and a gas detection element and an exhaust valve sequentially disposed on the exhaust pipe along the gas flow direction; and a control device configured to control the opening and closing of the exhaust valve based on the gas parameters detected by the gas detection element. Through an automatic detection and exhaust mechanism, the risk of high-temperature burning of the gas near the sealing ring due to high-pressure compression is reduced, preventing the sealing ring from failing due to high temperature.

Description

Technical Field

[0001] This application relates to the field of circuit board manufacturing equipment technology, and in particular to a plunger-type hydraulic cylinder and a hot press. Background Technology

[0002] In the PCB board forming process, the hot press is a key piece of equipment, and its core actuator is the plunger cylinder. The plunger cylinder drives the plunger rod through hydraulic oil, which in turn moves the pressing assembly to achieve the lamination process of the PCB board. The operational stability of the plunger cylinder plays a crucial role in the lamination quality.

[0003] In related technologies, due to reasons such as changing hydraulic oil in hydraulic systems or maintenance of plunger cylinders, gas inevitably gets mixed into the plunger cylinder body. During the operation of the plunger cylinder, the gas mixed inside is compressed, causing the temperature to rise sharply, which can easily cause the seals of the plunger cylinder to burn at high temperatures, leading to failure of the sealing function. Utility Model Content

[0004] Therefore, it is necessary to provide a plunger-type hydraulic cylinder and a hot press to address the problem that during the operation of the plunger-type hydraulic cylinder of a hot press, the gas mixed inside is compressed, causing a rapid rise in temperature, which can easily lead to high-temperature burning of the sealing ring and failure of the sealing function.

[0005] This application provides a plunger-type hydraulic cylinder, which includes:

[0006] The cylinder has a closed end and an open end at its two axial ends, and the cylinder is provided with an exhaust passage that communicates with the inside of the cylinder. The exhaust passage is located on the side near the open end of the cylinder.

[0007] A plunger rod is axially movable within the cylinder body;

[0008] A sealing ring is disposed between the plunger rod and the cylinder block, and the sealing ring is located between the exhaust passage and the opening end; and

[0009] An exhaust pipe, located outside the cylinder block, with one end connected to the exhaust passage, and a gas detection element and an exhaust valve sequentially arranged along the gas flow direction on the exhaust pipe; and

[0010] A control device is connected to the gas detector and the exhaust valve respectively, and the control device is configured to control the opening and closing of the exhaust valve according to the gas parameters detected by the gas detector.

[0011] In one embodiment, the gas detection element includes:

[0012] A first pressure sensor, the control device is configured to control the opening and closing of the exhaust valve based on the pressure value detected by the first pressure sensor; and / or,

[0013] The temperature sensor and control device are configured to control the opening and closing of the exhaust valve based on the temperature value detected by the temperature sensor.

[0014] In one embodiment, the plunger-type cylinder further includes a recovery pipe, on which a gas-liquid separator is provided; one end of the recovery pipe is connected to the outlet end of the exhaust pipe, and the other end of the recovery pipe is used to communicate with the oil tank.

[0015] In one embodiment, the plunger-type hydraulic cylinder further includes a cylinder head, which is detachably connected to the cylinder body and located at the open end of the cylinder body, with one end of the plunger rod extending from the cylinder head; a sealing ring is disposed on the inner peripheral wall of the cylinder head and located between the plunger rod and the cylinder head.

[0016] In one embodiment, the cylinder block has an annular mounting groove at its open end, and the cylinder head is mounted in the annular mounting groove;

[0017] The annular mounting groove has a bottom wall that faces outward along the cylinder block in the axial direction, and there is a gap between the cylinder head and the bottom wall; one end of the exhaust passage passes through the bottom wall to communicate with the gap.

[0018] In one embodiment, the exhaust passage includes a first section and a second section communicating with the first section. One end of the first section penetrates the bottom wall and communicates with the spacer, and the end of the second section away from the first section is connected to the exhaust pipe.

[0019] The first segment extends along the axial direction of the cylinder block, and the second segment extends along the radial direction of the cylinder block.

[0020] In one embodiment, the plunger-type hydraulic cylinder further includes a dust seal, which is disposed on the cylinder head and located between the cylinder head and the plunger rod. The inner periphery of the dust seal abuts against the outer periphery of the plunger rod to scrape off oil.

[0021] The inner circumferential wall of the cylinder head is provided with an annular oil reservoir extending circumferentially, and the annular oil reservoir is located axially between the dustproof ring and the sealing ring.

[0022] In one embodiment, the cylinder head is provided with an oil drain channel, one end of which is connected to an annular oil reservoir;

[0023] The plunger-type hydraulic cylinder also includes an oil drain pipe, which is located outside the cylinder body. One end of the oil drain pipe is connected to the oil drain channel. A second pressure detection element and an oil drain valve are sequentially provided on the oil drain pipe along the oil flow direction.

[0024] The control device is connected to the second pressure sensor and the oil drain valve respectively. The control device is configured to control the opening and closing of the oil drain valve according to the pressure value detected by the second pressure sensor.

[0025] In one embodiment, there are multiple sealing rings, which are arranged sequentially at intervals along the axial direction; the exhaust channel is located on the side of all the sealing rings closest to the closed end.

[0026] This application provides a hot press, including a pressing assembly and any of the plunger-type cylinders described in the above embodiments, wherein the plunger rod extends out of one end of the cylinder body or the cylinder body is connected to the pressing assembly.

[0027] In one embodiment, the pressing assembly includes a static pressure plate and a plurality of dynamic pressure plates that can be movably arranged along a first direction. In the first direction, the plurality of dynamic pressure plates and the static pressure plate are arranged sequentially at intervals and form a pressing cavity between each other. A plunger rod or cylinder is connected to the dynamic pressure plate away from the static pressure plate to drive the plurality of dynamic pressure plates to approach or move away from the static pressure plate.

[0028] When the aforementioned plunger-type hydraulic cylinder and hot press are working, hydraulic oil drives the plunger rod to move axially within the cylinder body. Gas mixed in with the cylinder flows with the hydraulic oil to the high-pressure area near the sealing ring. Under the high-pressure environment near the sealing ring, the gas is collected in the exhaust channel and enters the exhaust pipe. A gas detection device installed on the exhaust pipe can detect gas parameters (such as temperature and pressure) in the exhaust pipe in real time and transmit the detection results to the control device. When the gas parameters detected by the gas detection device are greater than a preset gas threshold, indicating high gas pressure and / or high gas temperature, the control device controls the exhaust valve to open, allowing gas to be discharged from the exhaust pipe. When the gas parameters detected by the gas detection device are lower than the preset gas threshold, the control device controls the exhaust valve to close. Through this automatic detection and exhaust mechanism, the gas content in the cylinder body can be reduced in a timely manner, lowering the risk of high-temperature burning caused by high-pressure compression of gas near the sealing ring, preventing the sealing ring from failing due to high temperature, thereby ensuring the sealing performance and operational reliability of the plunger-type hydraulic cylinder. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a hot press provided in an embodiment of this application when the pressing assembly is in a non-pressing state.

[0030] Figure 2 This is a schematic diagram of a hot press provided in an embodiment of this application when the pressing assembly is in the pressing state.

[0031] Figure 3 for Figure 2 A magnified view of the structure of area A and its connection with the gas detection device, exhaust valve, oil drain valve, and control device.

[0032] Figure label:

[0033] 10. Hot press; 20. Hydraulic oil;

[0034] 100. Plunger-type hydraulic cylinder;

[0035] 110. Cylinder block; 110a. Closed end; 110b. Open end; 111. Exhaust passage; 111a. First section; 111b. Second section; 112. Annular mounting groove;

[0036] 120. Piston rod; 121. Sealing ring; 121a. First sealing ring; 121b. Second sealing ring;

[0037] 130. Exhaust pipe; 131. Gas detection device; 131a. First pressure detection device; 131b. Temperature detection device; 132. Exhaust valve;

[0038] 140. Control device;

[0039] 150. Cylinder head; 150a. Spacing; 151. Dust seal; 152. Annular oil reservoir; 153. Oil drain passage;

[0040] 160. Oil drain pipe; 161. Second pressure detection element; 162. Oil drain valve;

[0041] 170. Recovery pipe; 171. Gas-liquid separator; 172. Oil tank;

[0042] 200, pressing assembly; 210, static pressure plate; 220, dynamic pressure plate; 201, pressing cavity. Detailed Implementation

[0043] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0044] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0045] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0049] As mentioned in the background section, in related technologies, gas inevitably gets mixed into the piston cylinder. Specifically, during operation, the pressure of the hydraulic oil drives the piston rod, causing the mixed gas to be compressed and its temperature to rise. Especially near the sealing ring, which is the last barrier against hydraulic oil in the piston cylinder, the area around the sealing ring is a high-pressure region. When the gas is compressed under high pressure near the sealing ring, its temperature rises sharply, making the sealing ring prone to overheating and burning, leading to sealing failure.

[0050] Please combine Figures 1 to 3 One embodiment of this application provides a plunger-type hydraulic cylinder 100, which includes: a cylinder body 110, a plunger rod 120, a sealing ring 121, an exhaust pipe 130, and a control device 140.

[0051] The cylinder block 110 has a closed end 110a and an open end 110b at its two axial ends, respectively. The cylinder block 110 is provided with an exhaust passage 111 that communicates with the interior of the cylinder block 110. The exhaust passage 111 is located on the side of the cylinder block 110 near the open end 110b. The plunger rod 120 is assembled into the cylinder block 110 from the open end 110b.

[0052] The plunger rod 120 is axially movable within the cylinder body 110, and one end of the plunger rod 120 extends from the open end 110b of the cylinder body 110. The end of the plunger rod 120 extending from the open end 110b of the cylinder body 110 is its output end, which is used to connect to the pressing assembly 200 of the hot press.

[0053] A sealing ring 121 is disposed between the plunger rod 120 and the cylinder body 110. The sealing ring 121 is located between the exhaust passage 111 and the open end 110b of the cylinder body 110, that is, the exhaust passage 111 is located on the side of the sealing ring 121 closer to the closed end 110a. Specifically, the sealing ring 121 is used to achieve a seal between the plunger rod 120 and the cylinder body 110 to prevent the hydraulic oil 20 in the cylinder body 110 from leaking.

[0054] The exhaust pipe 130 is located outside the cylinder block 110. One end of the exhaust pipe 130 is connected to the exhaust passage 111. A gas detection element 131 and an exhaust valve 132 are sequentially arranged on the exhaust pipe 130 along the gas flow direction. One end of the exhaust pipe 130 is connected to the end of the exhaust passage 111 near the outside of the cylinder block 110.

[0055] The control device 140 is connected to the gas detector 131 and the exhaust valve 132 respectively. The control device 140 is configured to control the opening and closing of the exhaust valve 132 according to the gas parameters detected by the gas detector 131.

[0056] When the aforementioned plunger-type hydraulic cylinder 100 is in operation, the hydraulic oil 20 drives the plunger rod 120 to move axially within the cylinder body 110. Gas mixed within the cylinder body 110 flows with the hydraulic oil 20 to the high-pressure area near the sealing ring 121. Under the high-pressure environment near the sealing ring 121, the gas is collected in the exhaust passage 111 and enters the exhaust pipe 130. A gas detection element 131 installed on the exhaust pipe 130 can detect gas parameters (such as temperature and pressure) within the exhaust pipe 130 in real time and transmit the detection results to the control device 140. When the gas parameters detected by the gas detection element 131 are greater than a preset gas threshold, indicating high gas pressure and / or high gas temperature, the control device 140 controls the exhaust valve 132 to open, allowing gas to be discharged from the exhaust pipe 130. When the gas parameters detected by the gas detection element 131 are lower than the preset gas threshold, the control device 140 controls the exhaust valve 132 to close. This automatic detection and exhaust mechanism can reduce the gas content in the cylinder 110 in a timely manner, reduce the risk of high-temperature burning caused by high-pressure compression of gas near the sealing ring 121, and prevent the sealing ring 121 from failing due to high temperature, thereby ensuring the sealing performance and operational reliability of the plunger cylinder 100.

[0057] The control device 140 can be a controller, a microcontroller, a microprocessor, etc. A preset gas threshold can be stored in the control device 140. When the control device 140 receives gas parameters detected by the gas detector 131, it can compare the detected gas parameters with the preset gas threshold, thereby controlling the opening and closing of the exhaust valve 132 based on the gas parameters detected by the gas detector 131.

[0058] Please refer to Figure 3 In one embodiment, the gas detection element 131 includes a first pressure detection element 131a and a temperature detection element 131b. The control device 140 is configured to control the opening and closing of the exhaust valve 132 based on the pressure value detected by the first pressure detection element 131a. The control device 140 is configured to control the opening and closing of the exhaust valve 132 based on the temperature value detected by the temperature detection element 131b.

[0059] When the plunger cylinder 100 is working, the gas mixed in the cylinder body 110 gathers in the high-pressure area near the sealing ring 121 and enters the exhaust passage 111 and exhaust pipe 130. The pressure and temperature of the gas will gradually increase due to high-pressure compression.

[0060] The first pressure detection element 131a monitors the gas pressure in the exhaust pipe 130 in real time. When the pressure value exceeds the preset gas pressure threshold of the control device 140, it indicates that the local pressure has risen abnormally due to gas accumulation. The control device 140 determines that exhaust is required and controls the exhaust valve 132 to open, releasing high-pressure gas and preventing the sealing ring 121 from being burned by high temperature due to high-pressure gas compression.

[0061] Temperature detection element 131b monitors the gas temperature in exhaust pipe 130 in real time. When the temperature value exceeds the preset temperature threshold of control device 140, it indicates that the gas has been compressed and heated to a risky temperature range that may burn the sealing ring 121. Control device 140 immediately controls exhaust valve 132 to open and quickly discharge high-temperature gas, thereby reducing local temperature.

[0062] In this embodiment, the control device 140 can be configured to open the exhaust valve 132 to exhaust gas when either the pressure or temperature value in the exhaust pipe 130 exceeds the standard, ensuring that exhaust can be started when a single parameter is abnormal; the control device 140 can also be configured to open the exhaust valve 132 to exhaust gas when both the pressure and temperature values ​​in the exhaust pipe 130 exceed the standard, thereby enabling more accurate and comprehensive exhaust based on the gas state.

[0063] In this embodiment, by monitoring both pressure and temperature, the control device 140 can more comprehensively determine the gas state inside the cylinder 110, and control the opening and closing of the exhaust valve 132 in a timely and accurate manner, effectively reducing the risk of failure of the sealing ring 121 due to gas compression and temperature rise.

[0064] In other embodiments, either the first pressure detection element 131a or the temperature detection element 131b can be provided on the exhaust pipe 130. When either of them exceeds the limit, the control device controls the exhaust valve to exhaust, which can also prevent the sealing ring 121 from being burned by high temperature due to high pressure gas compression.

[0065] Please refer to Figure 3 In some embodiments, the plunger cylinder 100 further includes a recovery pipe 170, on which a gas-liquid separator 171 is provided. One end of the recovery pipe 170 is connected to the outlet end of the exhaust pipe 130, and the other end of the recovery pipe 170 is used to communicate with the oil tank 172. The outlet end of the exhaust pipe 130 is the end of the exhaust pipe 130 away from the exhaust passage 111.

[0066] When the plunger cylinder 100 is working, after the exhaust valve 132 is opened, the gas discharged from the exhaust pipe 130 may carry a small amount of hydraulic oil (in the form of oil mist or droplets). The gas carrying hydraulic oil enters the recovery pipe 170 and first passes through the gas-liquid separator 171. The gas-liquid separator 171 separates the hydraulic oil particles in the gas, and the liquid oil droplets converge into an oil flow that flows back to the oil tank 172 along the recovery pipe 170, thereby realizing the recycling of hydraulic oil.

[0067] Please combine Figures 1 to 3In some embodiments, the plunger cylinder 100 further includes a cylinder head 150, which is detachably connected to the cylinder body 110 and located at the open end 110b of the cylinder body 110. One end of the plunger rod 120 extends from the cylinder head 150. A sealing ring 121 is disposed on the inner peripheral wall of the cylinder head 150 and located between the plunger rod 120 and the cylinder head 150.

[0068] The cylinder head 150 is installed at the open end of the cylinder block 110. The sealing rings 121 are in sealing contact with the outer peripheral wall of the plunger rod 120 and the inner peripheral wall of the cylinder head 150, respectively, thereby preventing high-pressure oil from leaking from the inside of the cylinder block 110 to the outside.

[0069] The cylinder head 150 is detachably connected to the cylinder block 110 and is installed at the open end 110b of the cylinder block 110. The sealing ring 121 is integrated into the inner peripheral wall of the cylinder head 150. Thus, when the sealing ring 121 is worn, aged, or requires maintenance, it is not necessary to disassemble the entire cylinder. Only the cylinder head 150 needs to be removed, and the sealing ring 121 can be taken out and replaced as a whole along with the cylinder head 150, which can shorten the maintenance time.

[0070] Please combine Figures 1 to 3 In some embodiments, the cylinder block 110 has an annular mounting groove 112 at its open end 110b, and the cylinder head 150 is mounted in the annular mounting groove 112. The annular mounting groove 112 has a bottom wall axially facing outwards from the cylinder block 110. Understandably, the bottom wall of the annular mounting groove 112 is a groove wall axially opposite to the cylinder head 150. A space 150a exists between the cylinder head 150 and the bottom wall. One end of the exhaust passage 111 passes through the bottom wall to communicate with the space 150a.

[0071] The annular mounting groove 112 at the open end 110b of the cylinder block 110 is used to mount the cylinder head 150, providing a positioning mounting base for the cylinder head 150. Since the sealing ring 121 is mounted on the cylinder head 150, and the space 150a is located between the cylinder head 150 and the bottom wall of the annular mounting groove 112, the space 150a is relatively close to the location of the sealing ring 121. This allows for the efficient collection of gas accumulated near the sealing ring 121, enabling the gas to pass through the space 150a and be discharged through the exhaust passage 111. This achieves two goals: firstly, it allows for the rapid collection and discharge of gas accumulated near the sealing ring 121, reducing the risk of the sealing ring 121 being burned by high temperatures; secondly, one end of the exhaust passage 111 penetrates the bottom wall of the annular mounting groove 112 and communicates with the space 150a, thus facilitating the machining of the exhaust passage 111.

[0072] Please combine Figures 1 to 3In some embodiments, the exhaust passage 111 includes a first section 111a and a second section 111b communicating with the first section 111a. One end of the first section 111a penetrates the bottom wall and communicates with the space 150a. The end of the second section 111b away from the first section 111a is connected to the exhaust pipe 130.

[0073] The first segment 111a extends along the axial direction of the cylinder 110, and the second segment 111b extends along the radial direction of the cylinder 110.

[0074] Specifically, the first segment 111a along the axial direction of the cylinder body 110 can be directly drilled through the bottom wall of the annular mounting groove 112 along the axial direction of the cylinder body 110 using conventional drilling technology, accurately connecting the interval space 150a, which is easy to process and has accurate positioning.

[0075] In this embodiment, the exhaust passage 111 is designed in two segments: a first segment 111a extending axially along the cylinder 110 and a second segment 111b extending radially along the cylinder 110. The directions of the first segment 111a and the second segment 111b are matched with the axial and radial directions of the cylinder 110 itself, which facilitates the machining when opening the exhaust passage.

[0076] In other embodiments, the exhaust passage 111 may also take other shapes, as long as it can connect the inside of the cylinder block to the exhaust pipe.

[0077] Please combine Figures 1 to 3 In some embodiments, the plunger-type hydraulic cylinder 100 further includes a dust seal 151, which is disposed on the cylinder head 150 and located between the cylinder head 150 and the plunger rod 120. The inner periphery of the dust seal 151 abuts against the outer periphery of the plunger rod 120 for scraping oil. The inner peripheral wall of the cylinder head 150 is provided with an annular oil reservoir 152 extending circumferentially therein, which is located axially between the dust seal 151 and the sealing ring 121.

[0078] In the plunger-type hydraulic cylinder 100, a dust seal 151 is installed between the cylinder head 150 and the plunger rod 120. When the plunger rod 120 reciprocates, it prevents external dust, debris, and other impurities from entering the cylinder. Furthermore, it effectively scrapes away the oil carried by the plunger rod 120 during its movement, preventing the plunger rod 120 from carrying oil out of the cylinder body 110. The scraped oil is collected in the annular oil reservoir 152 between the dust seal 151 and the sealing ring 121, thereby reducing hydraulic oil loss.

[0079] Please combine Figures 1 to 3 In some embodiments, the cylinder head 150 is provided with an oil drain channel 153, one end of which is connected to an annular oil reservoir 152.

[0080] The plunger-type hydraulic cylinder 100 also includes an oil drain pipe 160, which is located outside the cylinder body 110. One end of the oil drain pipe 160 is connected to the oil drain channel 153. A second pressure detection element 161 and an oil drain valve 162 are sequentially provided on the oil drain pipe 160 along the oil flow direction.

[0081] The control device 140 is connected to the second pressure detection element 161 and the oil drain valve 162 respectively. The control device 140 is configured to control the opening and closing of the oil drain valve 162 according to the pressure value detected by the second pressure detection element 161.

[0082] When the plunger cylinder 100 is working, the dust seal 151 scrapes off the oil carried by the plunger rod 120 and collects it in the annular oil reservoir 152. At this time, the oil in the annular oil reservoir 152 can flow into the oil drain pipe 160 outside the cylinder block 110 through the oil drain channel 153 in the cylinder head 150. The second pressure detection element 161 on the oil drain pipe 160 detects the oil pressure in the oil drain pipe 160 in real time and transmits the detection result to the control device 140. When the oil level in the annular oil reservoir 152 increases, causing the pressure in the drain pipe 160 to exceed the preset oil pressure threshold in the control device 140 (i.e., the oil pressure detected by the second pressure sensor 161 is greater than the preset oil pressure threshold in the control device 140), it indicates that excess oil needs to be discharged. The control device 140 then controls the drain valve 162 to open, and the oil is discharged through the drain pipe 160. When the oil pressure detected by the second pressure sensor 161 is lower than the preset oil pressure threshold, the control device 140 controls the drain valve 162 to close, stopping the oil discharge. This design, through pressure monitoring and intelligent control, achieves automatic oil discharge, which not only avoids excessive oil overflow from the annular oil reservoir 152 and environmental pollution, but also allows excess oil to be recycled, while reducing manual intervention and improving the stability and maintenance convenience of the hydraulic cylinder.

[0083] Please refer to Figure 3 In some embodiments, the plunger-type cylinder 100 further includes a recovery pipe 170, on which a gas-liquid separator 171 is provided. One end of the recovery pipe 170 is connected to the outlet end of the oil drain pipe 160, and the other end of the recovery pipe 170 is used to communicate with the oil tank 172. The outlet end of the oil drain pipe 160 is the end of the oil drain pipe 160 away from the oil drain channel 153.

[0084] When the plunger cylinder 100 is working, after the drain valve 162 is opened, the oil discharged from the drain pipe 160 enters the recovery pipe 170 and first passes through the gas-liquid separator 171. The gas-liquid separator 171 separates the mixed gas in the oil, thereby removing gas from the oil composition and recovering the purer oil to the oil tank 172, realizing the recycling of hydraulic oil.

[0085] Please refer to Figure 3In some embodiments, the recovery pipe 170 connected to the exhaust pipe 130 and the recovery pipe 170 connected to the oil drain pipe 160 are the same shared recovery pipe 170.

[0086] Please refer to Figure 3 In some embodiments, there are multiple sealing rings 121, which are arranged sequentially at intervals along the axial direction. The exhaust channel 111 is located on the side of all sealing rings 121 near the closed end 110a.

[0087] Multiple sealing rings 121 are arranged at intervals along the axial direction to form a multi-layer sealing barrier, which can significantly improve the sealing performance between the cylinder body 110 and the plunger rod 120 and reduce the risk of hydraulic oil leakage.

[0088] By placing all the sealing rings 121 of the exhaust channel 111 close to the closed end 110a, gas can be discharged in advance before it reaches the sealing rings 121, reducing the gas concentration and compression at the sealing rings 121, thereby reducing the damage to the sealing rings caused by high temperature and high pressure.

[0089] exist Figure 3 In the illustrated embodiment, two sealing rings 121 are arranged axially at a distance, namely a first sealing ring 121a and a second sealing ring 121b. The first sealing ring 121a is closer to the closed end of the cylinder body 110 than the second sealing ring 121b. The first sealing ring 121a can be a shaft sealing ring, and the second sealing ring 121b can be a U-shaped sealing ring.

[0090] Please refer to Figure 1 and Figure 2 An embodiment of this application also provides a hot press 10, including a pressing assembly 200 and a plunger-type hydraulic cylinder 100 of any of the above embodiments. One end of the plunger rod 120 extending out of the cylinder body 110 is connected to the pressing assembly 200, or the cylinder body 110 is connected to the pressing assembly 200.

[0091] Specifically, the relative movement between the plunger rod 120 and the cylinder 110 can be achieved by driving the hydraulic oil 20. The pressing assembly 200 can be connected to the end of the plunger rod 120 extending from the cylinder 110. During the actual lamination process, the cylinder 110 remains stationary, while the movement of the plunger rod 120 drives the pressing assembly 200 to perform the lamination process. Alternatively, the pressing assembly 200 can be connected to the cylinder 110. During the actual lamination process, the plunger rod 120 remains stationary, while the hydraulic oil 20 drives the plunger rod 120, causing the cylinder 110 to move relative to the plunger rod 120. This allows the cylinder 110 to drive the pressing assembly 200 to perform the lamination process.

[0092] When the plunger cylinder 100 of the aforementioned hot press is working, the hydraulic oil 20 drives the plunger rod 120 to move axially within the cylinder body 110. Gas mixed within the cylinder body 110 flows with the hydraulic oil 20 to the high-pressure area near the sealing ring 121. Under the high-pressure environment near the sealing ring 121, the gas is collected in the exhaust channel 111 and enters the exhaust pipe 130. A gas detection element 131 installed on the exhaust pipe 130 can detect gas parameters (such as temperature and pressure) within the exhaust pipe 130 in real time and transmit the detection results to the control device 140. When the gas parameters detected by the gas detection element 131 are greater than a preset gas threshold, indicating high gas pressure and / or high gas temperature, the control device 140 controls the exhaust valve 132 to open, allowing gas to be discharged from the exhaust pipe 130. When the gas parameters detected by the gas detection element 131 are lower than the preset gas threshold, the control device 140 controls the exhaust valve 132 to close. This automatic detection and exhaust mechanism can reduce the gas content in the cylinder 110 in a timely manner, reduce the risk of high-temperature burning caused by high-pressure compression of gas near the sealing ring 121, and prevent the sealing ring 121 from failing due to high temperature, thereby ensuring the sealing performance and operational reliability of the plunger cylinder 100.

[0093] Please combine Figure 1 and Figure 2 In one embodiment, the pressing assembly 200 includes a static pressure plate 210 and a plurality of dynamic pressure plates 220 movable along a first direction. In the first direction, the plurality of dynamic pressure plates 220 are sequentially spaced from the static pressure plate 210 and form a pressing cavity 201 between them. A plunger rod 120 or a cylinder 110 is connected to the dynamic pressure plate 220 away from the static pressure plate 210 to drive the plurality of dynamic pressure plates 220 closer to or away from the static pressure plate 210.

[0094] Specifically, the first direction can be the axial direction of the plunger-type hydraulic cylinder. Multiple dynamic pressure plates 220 are arranged sequentially at intervals along the first direction, and a static pressure plate 210 is arranged at intervals along one side of each of the multiple dynamic pressure plates 220 along the first direction. Thus, a pressing cavity 201 is formed between any two adjacent dynamic pressure plates 220, and a pressing cavity 201 is formed between the static pressure plate 210 and an adjacent dynamic pressure plate 220.

[0095] The plunger rod 120 or cylinder block 110 is connected to the dynamic pressure plate 220, which is furthest from the static pressure plate 210. The dynamic pressure plate 220 described here as furthest from the static pressure plate 210 should be understood as the dynamic pressure plate 220 furthest from the static pressure plate 210. Figure 1 and Figure 2 In the embodiment shown, one end of the plunger rod 120 extending out of the cylinder body 110 is connected to the dynamic pressure plate 220, which is away from the static pressure plate 210.

[0096] Driven by hydraulic oil 20, the plunger rod 120 or cylinder 110 drives multiple dynamic pressure plates 220 closer to the static pressure plate 210, thereby switching from a non-pressing state to a pressing state to achieve the lamination process. Conversely, when the plunger cylinder 100 performs the opposite motion to the above driving process, it can drive multiple dynamic pressure plates 220 away from the static pressure plate 210, thereby switching from a pressing state to a non-pressing state.

[0097] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A plunger-type hydraulic cylinder, characterized in that, The plunger-type hydraulic cylinder includes: The cylinder has a closed end and an open end at its two axial ends, and the cylinder is provided with an exhaust passage that communicates with the inside of the cylinder. The exhaust passage is located on the side near the open end of the cylinder. A plunger rod is axially movable within the cylinder body; A sealing ring is disposed between the plunger rod and the cylinder block, and the sealing ring is located between the exhaust passage and the opening end; and An exhaust pipe, located outside the cylinder block, with one end connected to the exhaust passage, and a gas detection element and an exhaust valve sequentially arranged along the gas flow direction on the exhaust pipe; and A control device is connected to the gas detector and the exhaust valve respectively, and the control device is configured to control the opening and closing of the exhaust valve according to the gas parameters detected by the gas detector.

2. The plunger-type hydraulic cylinder according to claim 1, characterized in that, The gas detection element includes: A first pressure sensor, wherein the control device is configured to control the opening and closing of the exhaust valve based on the pressure value detected by the first pressure sensor; and / or, A temperature sensor is included, and the control device is configured to control the opening and closing of the exhaust valve based on the temperature value detected by the temperature sensor.

3. The plunger-type hydraulic cylinder according to claim 1, characterized in that, It also includes a recovery pipe, on which a gas-liquid separator is provided; one end of the recovery pipe is connected to the outlet end of the exhaust pipe, and the other end of the recovery pipe is used to communicate with the fuel tank.

4. The plunger-type hydraulic cylinder according to claim 1, characterized in that, It also includes a cylinder head, which is detachably connected to the cylinder body and located at the open end of the cylinder body, with one end of the plunger rod extending from the cylinder head; the sealing ring is disposed on the inner peripheral wall of the cylinder head and located between the plunger rod and the cylinder head.

5. The plunger-type hydraulic cylinder according to claim 4, characterized in that, The cylinder block has an annular mounting groove at its open end, and the cylinder head is mounted in the annular mounting groove. The annular mounting groove has a bottom wall axially facing the outside of the cylinder block, and there is a gap between the cylinder head and the bottom wall; one end of the exhaust passage passes through the bottom wall to communicate with the gap.

6. The plunger-type hydraulic cylinder according to claim 5, characterized in that, The exhaust passage includes a first section and a second section connected to the first section. One end of the first section passes through the bottom wall and is connected to the space between the two sections. The end of the second section away from the first section is connected to the exhaust pipe. The first segment extends along the axial direction of the cylinder body, and the second segment extends along the radial direction of the cylinder body.

7. The plunger-type hydraulic cylinder according to claim 4, characterized in that, It also includes a dust seal, which is disposed on the cylinder head and located between the cylinder head and the plunger rod. The inner periphery of the dust seal abuts against the outer periphery of the plunger rod to scrape off oil. The cylinder head has an annular oil reservoir extending circumferentially on its inner peripheral wall, and the annular oil reservoir is located axially between the dustproof ring and the sealing ring.

8. The plunger-type hydraulic cylinder according to claim 7, characterized in that, The cylinder head is provided with an oil drain channel, one end of which is connected to the annular oil reservoir. The plunger-type hydraulic cylinder also includes an oil drain pipe located outside the cylinder body. One end of the oil drain pipe is connected to the oil drain channel. A second pressure detection element and an oil drain valve are sequentially arranged on the oil drain pipe along the oil flow direction. The control device is connected to the second pressure detection element and the oil drain valve respectively, and the control device is configured to control the opening and closing of the oil drain valve according to the pressure value detected by the second pressure detection element.

9. The plunger-type hydraulic cylinder according to claim 1, characterized in that, The number of sealing rings is multiple, and the multiple sealing rings are arranged sequentially at intervals along the axial direction; the exhaust channel is located on the side of all the sealing rings near the closed end.

10. A hot press, characterized in that, The device includes a pressing assembly and a plunger-type hydraulic cylinder according to any one of claims 1-9, wherein the plunger rod extends out of one end of the cylinder body or the cylinder body is connected to the pressing assembly.

11. The hot press according to claim 10, characterized in that, The pressing assembly includes a static pressure plate and a plurality of dynamic pressure plates that can be movably arranged along a first direction. In the first direction, the plurality of dynamic pressure plates and the static pressure plate are arranged sequentially at intervals and form a pressing cavity between each other. The plunger rod or the cylinder is connected to the dynamic pressure plate away from the static pressure plate and is used to drive the plurality of dynamic pressure plates to approach or move away from the static pressure plate.

Images