CN118224151A - Hydraulic system and chamber filter press - Google Patents

Abstract

The invention relates to a hydraulic system and a chamber filter press, belonging to the technical field of hydraulic pressure, and comprising an oil supply system and an oil cylinder, wherein the oil cylinder comprises a cylinder body, a cooling jacket is arranged outside the cylinder body, a cooling cavity is arranged between the cooling jacket and the cylinder body, a cooling medium is arranged in the cooling cavity, and the volume of the cooling medium is smaller than that of the cooling cavity; the cylinder body is fixedly provided with a connecting sleeve at the bottom, the connecting sleeve stretches into the buffering cavity and is in sliding fit with the side wall of the buffering cavity, and a spring is arranged between the bottom walls of the connecting sleeve; the buffer cavity is connected with an air inlet one-way valve and a liquid discharge one-way valve, the air inlet one-way valve is communicated with the cooling cavity through a first hose, and the liquid discharge one-way valve is communicated with the cooling cavity through a second hose. The hydraulic oil cooling device does not need to be provided with power equipment, has low operation cost, can cool hydraulic oil, can play a good role in buffering and damping, has a simple structure, and is easy to produce and manufacture.

Description

Hydraulic system and chamber filter press

Technical Field

The invention belongs to the technical field of hydraulic pressure, and particularly relates to a hydraulic system and a chamber filter press.

Background

The box filter press pushes the filter plates to move through the oil cylinders, so that the filter plates compress the filtered materials, and liquid in the filtered materials is pressed out, and the oil cylinders are power equipment of the box filter press and are controlled and driven by the hydraulic system. In the filter pressing process, overheat condition possibly occurs, so that the temperature of the hydraulic oil is increased, the viscosity is reduced, and meanwhile, the performance of the sealing element is reduced, and the risk of oil leakage is increased. Therefore, cooling of the ram is often required.

At present, the cooling of the cylinder is usually performed by water cooling, for example, the invention of the application number of cn201910854901.X discloses a hydraulic cylinder, which comprises a piston rod, a cylinder body and a cylinder body cooling jacket assembly for providing cooling for the piston rod and/or the cylinder body, wherein a cooling cavity is formed between the cooling jacket assembly and the cylinder body and/or the piston rod, the cooling cavity is provided with an inlet and an outlet for forming a cooling medium flow path, and the cooling medium is usually water. The hydraulic cylinder has a good cooling effect, but the flow of the cooling medium requires power supplied by power equipment such as a pump and the like, so that the energy consumption is increased.

In addition, in the running process, the oil cylinder usually bears larger load and is subjected to larger impact and is easy to damage, so that a buffer mechanism is needed to be arranged, for example, the invention patent with the application number of CN202011126003.1 discloses a buffer hydraulic cylinder, which comprises a hydraulic cylinder body and a buffer device movably connected with the hydraulic cylinder body; the buffer device comprises a buffer cylinder; the buffer piston is connected inside the buffer cylinder in a sliding way; the piston rod of the hydraulic cylinder body extends into the buffer cylinder in a sealing way and is fixedly connected with the buffer piston; a protection device is arranged between the buffer piston and the top in the buffer cylinder; the bottom of buffer cylinder is equipped with the inlet channel that can close, through having set up the buffer cylinder, has set up the buffer piston in the buffer cylinder to can fill gas in the cavity below the buffer piston, in order to prevent that the pneumatic cylinder from bumping the cylinder bottom, when the pneumatic cylinder is retracted simultaneously, owing to be equipped with protection device in the buffer piston and the buffer cylinder between the top, can prevent that the pneumatic cylinder from bumping the cylinder top, thereby guaranteed the life of pneumatic cylinder. In addition, the invention patent with the application number of CN201810668700.6 discloses a hydraulic cylinder buffer structure which comprises a cylinder body and a piston rod; a buffer cavity is arranged in the cylinder body; the piston rod is provided with a piston, and the inner end of the piston rod is provided with a buffer end matched with the buffer cavity; the buffer cavity is a cylindrical blind hole; the buffer end is cylindrical, and a mounting hole is formed in the center of the buffer end; the position of the mounting hole close to the inner side is provided with a diversion trench, and the diversion trench is communicated with the inner side and the outer side of the mounting hole; a buffer plug is slidably arranged in the mounting hole, and the buffer plug is provided with an axially-through guide hole; a spring is arranged between the buffer plug and the bottom of the mounting hole, and when the buffer end and the buffer cavity are matched for buffering, the flow is regulated through the oil pressure of the spring and the buffer cavity, so that the flow is ensured to have a stable change process; the whole structure is simple, the processing and the manufacturing are convenient, and the cost is low.

The existing oil cylinder has good buffering effect, but does not have a cooling function.

Disclosure of Invention

The invention aims to solve the technical problem of providing a hydraulic system and a chamber filter press, which have the functions of cooling, buffering and damping on the premise that the structure of an oil cylinder is kept relatively simple, and the energy consumption of the oil cylinder is not increased additionally.

In order to solve the problems, the invention adopts the following technical scheme: the hydraulic system comprises an oil supply system and an oil cylinder, wherein the oil cylinder comprises a cylinder body, a piston is arranged in the cylinder body, the piston is connected with a piston rod, a rodless cavity and a rod cavity are respectively arranged on two sides of the piston, the rodless cavity and the rod cavity are respectively connected with a first oil hole and a second oil hole, and the first oil hole and the second oil hole are both connected with the oil supply system;

A cooling jacket is arranged outside the cylinder body, a cooling cavity is arranged between the cooling jacket and the cylinder body, a cooling medium is arranged in the cooling cavity, and the volume of the cooling medium is smaller than that of the cooling cavity;

The cylinder body is characterized by further comprising a mounting seat, wherein a buffer cavity is formed in one end face of the mounting seat, a connecting sleeve is fixedly arranged at the bottom of the cylinder body, the connecting sleeve stretches into the buffer cavity and is in sliding fit with the side wall of the buffer cavity, and a spring is arranged between the bottom wall of the buffer cavity and the connecting sleeve;

The buffer cavity is connected with an air inlet one-way valve and a liquid discharge one-way valve, the air inlet one-way valve is communicated with the cooling cavity through a first hose, and the liquid discharge one-way valve is communicated with the cooling cavity through a second hose.

Further, the buffer cavity is connected with a vacuumizing valve.

Further, the bottom of mount pad is provided with the cooling chamber, be provided with cooling medium in the cooling chamber, the outer wall of mount pad is provided with heat conduction fin, heat conduction fin stretches into the cooling chamber.

Further, the oil supply system comprises an oil tank, an oil pump and a valve group which are connected in sequence through oil pipes, and the valve group is connected with the first oil hole and the second oil hole through the oil pipes.

Further, a pressure sensor is arranged on the end face of the piston rod, a speed sensor is arranged on the piston rod, and the pressure sensor, the speed sensor, the oil pump and the valve group are all connected with a controller;

The pressure sensor is used for detecting the pressure born by the piston rod and transmitting a pressure signal to the controller; the speed sensor is used for detecting the movement speed of the piston rod and transmitting a speed signal to the controller; the controller is used for receiving the pressure signal and the speed signal and controlling the operation of the oil pump and the valve group so that the movement of the piston rod meets the following conditions: the movement speed of the piston rod decreases when the pressure increases, and increases when the pressure decreases.

Further, the liquid discharge one-way valve is connected with the controller.

Further, the piston rod penetrates through the piston, and a third sealing ring and a fourth sealing ring are arranged between the piston rod and the inner wall of the piston; a detection blind hole extending from the outer end surface of the piston rod to the interior of the piston is formed in the piston rod, and a first channel extending radially from the detection blind hole to the outer wall of the piston rod is formed in the side wall of the piston rod; the piston is characterized in that an annular first sealing groove and an annular second sealing groove are formed in the circumferential surface of the piston, a first sealing ring and a second sealing ring are respectively arranged in the first sealing groove and the second sealing groove, an annular oil collecting groove is arranged between the first sealing groove and the second sealing groove, the oil collecting groove is connected with a second channel which radially extends from the oil collecting groove to the inner wall of the piston, and the second channel is communicated with the first channel; and a detection mechanism is arranged in the detection blind hole.

Further, the detection mechanism includes an image acquisition mechanism.

Further, a detachable pressure head is arranged at the end part of the piston rod, and the detection mechanism is arranged on the pressure head; and capillary adsorption cores are arranged in the second channel and the first channel, one end of each capillary adsorption core extends into the oil collecting groove, and the other end extends into the detection blind hole.

The box filter press comprises the hydraulic system.

The beneficial effects of the invention are as follows: when the temperature of the hydraulic oil is increased, the cooling medium in the cooling jacket absorbs heat, part of the cooling medium evaporates into vapor, so that the pressure of the cooling cavity is increased, and the vapor enters the buffer cavity through the first hose and the air inlet one-way valve. When the oil cylinder pushes the filter plate to move, the reaction force is received and transmitted to the spring through the cylinder body, the spring plays a buffering role, at the moment, the spring is compressed, vapor in the buffering cavity is compressed, the vapor can play a buffering role, the pressure of the buffering cavity is increased, the vapor is compressed, the pressure is increased to be liquefied and becomes liquid cooling medium again, the liquid cooling medium flows back to the cooling cavity through the liquid discharge one-way valve and the second hose, the pressure in the cooling cavity is smaller than the buffering cavity, the liquid cooling medium enters the cooling cavity, the cooling medium is caused to evaporate to absorb heat, and the temperature of hydraulic oil is reduced.

Therefore, the invention utilizes the reaction force received by the oil cylinder during operation as power to promote the liquefaction and evaporation of the cooling medium, realizes the circulation flow and heat absorption and heat release, does not need to arrange power equipment, has low operation cost, can cool hydraulic oil, can play a good role in buffering and damping, and has the advantages that the structure of the whole oil cylinder is not complex, and the production and the manufacturing are easy.

Drawings

FIG. 1 is an overall schematic of a hydraulic system of the present invention;

FIG. 2 is a schematic cross-sectional view of a hydraulic cylinder of the present invention;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

Reference numerals: 1-an oil cylinder; 11-a cylinder; 12-a piston; 13-a piston rod; 14-a cooling jacket; 15-a cooling cavity; 16-a mounting seat; 17-a buffer chamber; 18-connecting sleeve; 19-a spring; 110-an air inlet check valve; 111-a drain check valve; 112-a first hose; 113-a second hose; 114-a vacuumizing valve; 115—rodless cavity; 116-rod cavity; 117—a first oil hole; 118-a cooling chamber; 119-heat conducting fins; 120-a second oil hole; 121—a pressure sensor; 122-a speed sensor; 123-a controller; 124-a first seal ring; 125—a second seal ring; 126-oil sump; 127-a third seal ring; 128-a fourth seal ring; 129-blind detection hole; 130-a first channel; 131-a second channel; 132—a detection mechanism; 133-ram; 21-an oil tank; 22-an oil pump; 23-valve group.

Detailed Description

The invention will be further described with reference to the drawings and examples.

The hydraulic system of the invention, as shown in fig. 1 to 3, comprises an oil supply system and an oil cylinder 1, wherein the oil cylinder 1 comprises a cylinder body 11, a piston 12 is arranged in the cylinder body 11, the piston 12 is fixedly connected with a piston rod 13, a rodless cavity 115 and a rod cavity 116 are respectively arranged on two sides of the piston 12, the rodless cavity 115 and the rod cavity 116 are respectively connected with a first oil hole 117 and a second oil hole 120, and the first oil hole 117 and the second oil hole 120 are both connected with the oil supply system.

When the oil supply system injects oil into the rodless cavity 115 through the first oil hole 117, the piston 12 can be pushed to move, and the piston rod 13 is driven to move outwards, so that the filter plate of the chamber filter press is pressed; when the oil supply system injects oil into the rod cavity 116 through the second oil hole 120, the piston 12 can be pushed to move, the piston rod 13 is driven to move towards the interior of the cylinder 11, and the filter plate is driven to loosen the filtered material, so that filter residues can be discharged conveniently.

The outside of cylinder body 11 is provided with cooling jacket 14, is provided with cooling chamber 15 between cooling jacket 14 and the cylinder body 11, is provided with cooling medium in the cooling chamber 15, and cooling medium's volume is less than cooling chamber 15's volume. Specifically, the cooling medium may be a common refrigeration medium such as water, and the volume of the cooling medium may be half of the volume of the cooling cavity 15, so as to ensure that the cooling medium has a proper evaporation area.

The invention further comprises a mounting seat 16, wherein the mounting seat 16 is used for integrally and fixedly mounting the cylinder body 11 on a frame of the chamber filter press, a buffer cavity 17 is formed in one end face of the mounting seat 16, a connecting sleeve 18 is fixedly arranged at the bottom of the cylinder body 11, the connecting sleeve 18 stretches into the buffer cavity 17 and is in sliding fit with the side wall of the buffer cavity 17, and a spring 19 is arranged between the bottom wall of the buffer cavity 17 and the connecting sleeve 18. The connecting sleeve 18 can axially move, when the piston rod 13 of the cylinder 11 moves outwards and applies thrust to the filter plate, the piston rod 13 receives the reaction force of the filter plate, the reaction force is transmitted to the cylinder 11, the connecting sleeve 18 is transmitted to the spring 19, and the spring 19 is compressed, so that the functions of buffering and damping are achieved.

The buffer chamber 17 is connected with an intake check valve 110 and a drain check valve 111, the intake check valve 110 is communicated with the cooling chamber 15 through a first hose 112, and the drain check valve 111 is communicated with the cooling chamber 15 through a second hose 113.

During filter pressing, the motion of the oil cylinder 1 can be divided into two stages, namely a filter pressing stage and a return stage, wherein the filter pressing stage refers to a stage in which the piston rod 13 extends outwards and pushes the filter plate to press the filtered material, and the return stage refers to a stage in which the piston rod 13 drives the filter plate to loosen the filtered material.

The air inlet check valve 110 is communicated with the buffer cavity 17 from outside, and the liquid discharge check valve 111 is communicated with the buffer cavity 17 from inside. When the temperature of the hydraulic oil increases, the cooling medium in the cooling cavity 15 absorbs heat, part of the cooling medium evaporates to be gaseous, so that the pressure in the cooling cavity 15 increases, the reaction force borne by the cylinder body 11 decreases in the return stage, the connecting sleeve 18 and the cylinder body 11 move towards the direction away from the mounting seat 16, so that the pressure in the buffer cavity 17 decreases, and at the moment, the steam in the cooling cavity 15 can enter the buffer cavity 17 through the first hose 112; in the filter pressing stage, the liquid discharge one-way valve 111 is closed, the cylinder 11 and the connecting sleeve 18 move towards the direction of the mounting seat 16, steam in the buffer cavity 17 is extruded, the pressure of the steam is increased, and part of the steam is liquefied. When the cylinder 11 and the connecting sleeve 18 stop moving, the liquid discharge check valve 111 is opened, so that the liquefied cooling medium is forced to enter the cooling cavity 15 through the liquid discharge check valve 111 and the second hose 113, and the pressure in the buffer cavity 17 is higher at this time, and the pressure in the cooling cavity 15 is lower, so that the liquid cooling medium is gasified, absorbs heat, and reduces the temperature of the hydraulic oil.

Liquefied cooling medium is collected at the bottom of the buffer chamber 17, and thus a drain check valve 111 is provided at the bottom of the buffer chamber 17 so that the liquefied cooling medium rapidly enters the cooling chamber 15. In general, the cylinder 1 is horizontally disposed on the frame of the chamber filter press, so that the drain check valve 111 may be disposed in the manner shown in fig. 2. The connection points of the first and second hoses 112, 113 to the cooling chamber 15 are located at the top of the cooling chamber 15 to ensure that vapour can enter the first hose 112 quickly, while liquid medium passing through the second hose 113 can evaporate quickly. In order to improve evaporation efficiency, an atomizer can be arranged at the top of the cooling cavity 15, the second hose 113 is connected with the atomizer, and the liquid medium is sprayed out after being atomized by the atomizer, so that evaporation area is larger.

In the invention, the structure of the oil cylinder 1 is relatively simple, the manufacturing cost is low, and the invention utilizes the power of the oil cylinder 1 in working to promote the evaporation, liquefaction and flow of the cooling medium, does not need additional power equipment, and reduces the running cost. In addition, the evaporation of the cooling medium can quickly take away heat, so that good heat dissipation efficiency is ensured. In addition, vapor in the buffer cavity 17 and the spring 19 are compressed simultaneously, so that good buffering and damping effects are achieved, and the service life of the oil cylinder 1 is prolonged.

To promote the evaporation of the cooling medium in the cooling chamber 15, a vacuum valve 114 is connected to the buffer chamber 17. The buffer cavity 17 can be vacuumized through the vacuuming valve 114, and the buffer cavity 17 is communicated with the cooling cavity 15 through the air inlet one-way valve 110 and the first hose 112, so that air in the cooling cavity 15 can be pumped out simultaneously, the pressure in the cooling cavity 15 is reduced, the boiling point of a cooling medium is reduced, and the cooling medium is easier to evaporate, so that the cooling efficiency is improved.

When the vapor in the buffer chamber 17 is compressed and liquefied, the cooling medium releases heat, and in order to reduce the temperature of the mounting seat 16, the connecting sleeve 18, and the like, a cooling chamber 118 is provided at the bottom of the mounting seat 16, the cooling medium is provided in the cooling chamber 118, a plurality of heat conduction fins 119 are provided on the outer wall of the mounting seat 16, and the heat conduction fins 119 extend into the cooling chamber 118. The cooling medium in the cooling chamber 118 may be water. Heat in the buffer chamber 17 may be transferred to the cooling medium through the heat conductive fins 119, thereby lowering the temperature in the buffer chamber 17. The heat conduction fins 119 may be copper sheets or the like.

In the present invention, the oil supply system includes an oil tank 21, an oil pump 22 and a valve group 23 connected in sequence through an oil pipe, and the valve group 23 is connected to the first oil hole 117 and the second oil hole 120 through the oil pipe. The oil tank 21 is for storing hydraulic oil, and a temperature sensor may be provided in the oil tank 21 to detect the temperature of the hydraulic oil. The oil pump 22 is used for driving hydraulic oil to flow, so that the oil cylinder 1 is driven to operate. The oil pump 22 and the valve block 23 can control the pressure, flow direction, flow rate, etc. of the hydraulic oil.

The oil tank 21, the oil pump 22 and the valve group 23 are all in the prior art, the oil pump 22 conveys hydraulic oil to the valve group 23, the valve group 23 conveys the hydraulic oil to the first oil hole 117 through an oil pipe in a filter pressing stage, the hydraulic oil enters the rodless cavity 115 and pushes the piston 12 to move, meanwhile, the hydraulic oil in the rod cavity 116 flows to the valve group 23 through the oil pipe and then returns to the oil tank 21; in the return stage, the valve block 23 conveys the hydraulic oil to the second oil hole 120 through the oil pipe, the hydraulic oil pushes the piston 12 to reset after entering the rod cavity 116, and meanwhile, the hydraulic oil in the rodless cavity 115 flows to the valve block 23 through the oil pipe and then returns to the oil tank 21.

In the filter pressing process, the pressure of the filter plate to the filtered material is gradually increased and continuously changed, when the pressure of the filter plate to the filtered material is larger, the reaction force born by the filter plate is larger, the moving speed of the filter plate is smaller at the moment, the filter plate can be prevented from being damaged, and when the pressure of the filter plate to the filtered material is smaller, the reaction force born by the filter plate is smaller, and the filter plate is not easy to damage at the moment, so that the moving speed of the filter plate can be properly improved, and the filter pressing efficiency is ensured. In a conventional chamber filter press, an oil supply system generally introduces hydraulic oil into an oil cylinder 1 at a constant speed, and the oil cylinder 1 drives a filter plate to move at a constant speed, and cannot adjust the movement speed of the filter plate according to the load born by the filter plate.

To solve this problem, the end face of the piston rod 13 is provided with a pressure sensor 121, the piston rod 13 is provided with a speed sensor 122, and the pressure sensor 121, the speed sensor 122, the oil pump 22 and the valve group 23 are all connected with a controller 123.

The pressure sensor 121 is used for detecting the pressure born by the piston rod 13 and transmitting a pressure signal to the controller 123; the speed sensor 122 is used for detecting the movement speed of the piston rod 13 and transmitting a speed signal to the controller 123; the controller 123 is configured to receive the pressure signal and the speed signal and control the operation of the oil pump 22 and the valve block 23 such that the movement of the piston rod 13 satisfies: when the pressure increases, the movement speed of the piston rod 13 decreases, and when the pressure decreases, the movement speed of the piston rod 13 increases.

In the chamber filter press, an oil cylinder 1, a pressing plate, a plurality of filter plates and a thrust plate are sequentially arranged on a frame of the chamber filter press, wherein the pressing plate and the plurality of filter plates are in sliding fit with the frame, and the thrust plate is fixed on the frame and used for limiting the position of the filter plates. The piston rod 13 of the oil cylinder 1 is connected with the pressing plate, the power of the oil cylinder 1 is transmitted to the filter plate through the pressing plate, and the reaction force born by the filter plate is also transmitted to the piston rod 13 through the pressing plate, so that the pressure sensor 121 is arranged on the end face of the piston rod 13, the pressure sensor 121 can detect the acting force between the piston rod 13 and the pressing plate, and the pressure born by the filter plate is further determined. The speed sensor 122 can detect the moving speed of the piston rod 13 so as to accurately control the moving speed of the piston rod 13.

The flow rate of hydraulic oil entering the oil cylinder 1 can be regulated through the oil pump 22 and the valve group 23, and the moving speed of the piston rod 13 can be regulated. According to the invention, the moving speed of the piston rod 13 is regulated according to the pressure received by the piston rod 13, so that the moving speed of the filter plate can be reduced when the pressure received by the filter plate is high, and the moving speed of the filter plate can be increased when the pressure received by the filter plate is low, thereby ensuring the safety of the filter plate and improving the filter pressing efficiency.

In the present invention, the drain check valve 111 is connected to the controller 123. The controller 123 is utilized to automatically control the opening and closing of the liquid discharge one-way valve 111, thereby improving the automation level.

In the operation process of the hydraulic system, oil leakage is frequently caused, and the oil leakage is divided into external leakage and internal leakage, wherein the external leakage refers to the leakage of oil in an oil pipe and an oil cylinder 1 to the outside; the internal leakage means that the oil in the cylinder 1 leaks from the high pressure chamber into the low pressure chamber, for example, when the piston rod 13 is extended outward, the oil pressure in the rodless chamber 115 is greater than the oil pressure in the rod chamber 116, and the hydraulic oil in the rodless chamber 115 enters the rod chamber 116 under the action of the pressure difference. The leakage is generally easy to find, can be observed by naked eyes, and can be overhauled in time, but the leakage is difficult to find in time and cannot be overhauled in time.

In order to quickly find an internal leakage fault, in the invention, the piston rod 13 penetrates the piston 12, and locking nuts which are in threaded fit with the piston rod 13 can be arranged on two sides of the piston 12, so that the piston rod 13 and the piston 12 are connected into a whole. A third sealing ring 127 and a fourth sealing ring 128 are arranged between the piston rod 13 and the inner wall of the piston 12, annular first sealing grooves and annular second sealing grooves are formed in the circumferential surface of the piston 12, a first sealing ring 124 and a second sealing ring 125 are respectively arranged in the first sealing grooves and the second sealing grooves, and the first sealing ring 124, the second sealing ring 125, the third sealing ring 127 and the fourth sealing ring 128 can play a sealing role, so that the internal leakage risk is reduced. The piston rod 13 is provided with a detection blind hole 129 extending from the outer end surface thereof to the interior of the piston 12, and the side wall of the piston rod 13 is provided with a first channel 130 extending radially from the detection blind hole 129 to the outer wall of the piston rod 13; an annular oil collecting groove 126 is arranged between the first sealing groove and the second sealing groove, the oil collecting groove 126 is connected with a second channel 131 which radially extends from the oil collecting groove 126 to the inner wall of the piston 12, and the second channel 131 is communicated with the first channel 130; a detection mechanism 132 is disposed in the detection blind hole 129.

Since the first seal ring 124 and the second seal ring 125 often slide between the inner walls of the cylinder 11 relative to each other, the risk of internal leakage is higher, and therefore, an annular oil collecting groove 126 is provided between the first seal groove and the second seal groove, when internal leakage occurs, whether leakage from the rod-free cavity 115 into the rod cavity 116 or leakage from the rod cavity 116 into the rod-free cavity 115 occurs, hydraulic oil reaches the oil collecting groove 126, when hydraulic oil reaches the oil collecting groove 126, hydraulic oil enters the oil collecting groove 126, and flows into the detection blind hole 129 through the second channel 131 and the first channel 130, the detection mechanism 132 can detect whether hydraulic oil is present in the detection blind hole 129, and when hydraulic oil is present in the detection blind hole 129, the occurrence of internal leakage is indicated, and immediate maintenance is required. The second channel 131 and the first channel 130 may be provided in plurality, for example, three or the like.

The detection mechanism 132 may adopt a laser detection probe, where the laser detection probe emits laser to the bottom of the detection blind hole 129, and receives laser reflected by the bottom of the detection blind hole 129, when the leaked hydraulic oil enters the detection blind hole 129, the laser generates refraction and reflection when passing through the hydraulic oil, and the intensity of the reflected laser changes, so as to detect the existence of the hydraulic oil.

In addition, the detection mechanism 132 may also adopt an image acquisition mechanism, which may be a miniature camera, and an illumination lamp bead is disposed beside the camera, so as to acquire an image of the bottom of the detection blind hole 129, and determine whether hydraulic oil exists according to the detected image.

The detection mechanism 132 may be controlled by the controller 123 to detect at intervals, for example, every other hour.

In order to facilitate the installation of the detection mechanism 132, the end part of the piston rod 13 is provided with a detachable pressure head 133, the pressure head 133 can be in threaded fit with the piston rod 13, and the detection mechanism 132 is installed on the pressure head 133; the second channel 131 and the first channel 130 are internally provided with capillary adsorption cores, one end of each capillary adsorption core extends into the oil collecting groove 126, and the other end extends into the detection blind hole 129. The pressure sensor 121 may be disposed at an outer end surface of the ram 133, and the speed sensor 122 may be disposed at a sidewall of the ram 133. Because the speed of the automatic flow of the hydraulic oil is slower, a capillary adsorption core is arranged, and the capillary adsorption core can quickly suck the hydraulic oil in the oil collecting groove 126 into the detection blind hole 129, so that the internal leakage can be found more timely. The capillary adsorption core can be specifically made of materials with stronger capillary force such as cotton threads and the like.

The chamber filter press of the invention comprises a hydraulic system shown in fig. 1 to 3, and other parts adopt the prior art. In order to ensure the stability of the cylinder 1, a positioning sleeve can be arranged on the frame of the chamber filter press, and the cylinder body 11 is positioned in the sleeve and is in sliding fit with the sleeve.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The hydraulic system comprises an oil supply system and an oil cylinder (1), wherein the oil cylinder (1) comprises a cylinder body (11), a piston (12) is arranged in the cylinder body (11), the piston (12) is connected with a piston rod (13), a rodless cavity (115) and a rod cavity (116) are respectively arranged on two sides of the piston (12), the rodless cavity (115) and the rod cavity (116) are respectively connected with a first oil hole (117) and a second oil hole (120), and the first oil hole (117) and the second oil hole (120) are both connected with the oil supply system;

A cooling jacket (14) is arranged outside the cylinder body (11), a cooling cavity (15) is arranged between the cooling jacket (14) and the cylinder body (11), a cooling medium is arranged in the cooling cavity (15), and the volume of the cooling medium is smaller than that of the cooling cavity (15);

The method is characterized in that: the cylinder body is characterized by further comprising a mounting seat (16), wherein a buffer cavity (17) is formed in the end face of one end of the mounting seat (16), a connecting sleeve (18) is fixedly arranged at the bottom of the cylinder body (11), the connecting sleeve (18) stretches into the buffer cavity (17) and is in sliding fit with the side wall of the buffer cavity (17), and a spring (19) is arranged between the bottom wall of the buffer cavity (17) and the connecting sleeve (18);

the buffer cavity (17) is connected with an air inlet one-way valve (110) and a liquid discharge one-way valve (111), the air inlet one-way valve (110) is communicated with the cooling cavity (15) through a first hose (112), and the liquid discharge one-way valve (111) is communicated with the cooling cavity (15) through a second hose (113).

2. The hydraulic system of claim 1, wherein: the buffer cavity (17) is connected with a vacuumizing valve (114).

3. The hydraulic system of claim 1, wherein: the bottom of mount pad (16) is provided with cooling chamber (118), be provided with cooling medium in cooling chamber (118), the outer wall of mount pad (16) is provided with heat conduction fin (119), heat conduction fin (119) stretch into cooling chamber (118).

4. The hydraulic system of claim 1, wherein: the oil supply system comprises an oil tank (21), an oil pump (22) and a valve group (23) which are connected through oil pipes in sequence, wherein the valve group (23) is connected with a first oil hole (117) and a second oil hole (120) through the oil pipes.

5. The hydraulic system of claim 4, wherein: the end face of the piston rod (13) is provided with a pressure sensor (121), the piston rod (13) is provided with a speed sensor (122), and the pressure sensor (121), the speed sensor (122), the oil pump (22) and the valve group (23) are all connected with a controller (123);

The pressure sensor (121) is used for detecting the pressure born by the piston rod (13) and transmitting a pressure signal to the controller (123); the speed sensor (122) is used for detecting the movement speed of the piston rod (13) and transmitting a speed signal to the controller (123); the controller (123) is used for receiving the pressure signal and the speed signal and controlling the operation of the oil pump (22) and the valve group (23) so that the movement of the piston rod (13) meets the following conditions: when the pressure increases, the movement speed of the piston rod (13) decreases, and when the pressure decreases, the movement speed of the piston rod (13) increases.

6. The hydraulic system of claim 5, wherein: the liquid discharge one-way valve (111) is connected with the controller (123).

7. The hydraulic system of claim 1, 2,3, 4, 5, or 6, wherein: the piston rod (13) penetrates through the piston (12), and a third sealing ring (127) and a fourth sealing ring (128) are arranged between the piston rod (13) and the inner wall of the piston (12); a detection blind hole (129) extending from the outer end surface of the piston rod (13) to the interior of the piston (12) is formed in the piston rod (13), and a first channel (130) radially extending from the detection blind hole (129) to the outer wall of the piston rod (13) is formed in the side wall of the piston rod (13); an annular first sealing groove and an annular second sealing groove are formed in the circumferential surface of the piston (12), a first sealing ring (124) and a second sealing ring (125) are respectively arranged in the first sealing groove and the second sealing groove, an annular oil collecting groove (126) is arranged between the first sealing groove and the second sealing groove, the oil collecting groove (126) is connected with a second channel (131) which radially extends from the oil collecting groove (126) to the inner wall of the piston (12), and the second channel (131) is communicated with the first channel (130); a detection mechanism (132) is arranged in the detection blind hole (129).

8. The hydraulic system of claim 7, wherein: the detection mechanism (132) includes an image acquisition mechanism.

9. The hydraulic system of claim 8, wherein: the end part of the piston rod (13) is provided with a detachable pressure head (133), and the detection mechanism (132) is arranged on the pressure head (133); and capillary adsorption cores are arranged in the second channel (131) and the first channel (130), one end of each capillary adsorption core extends into the oil collecting groove (126), and the other end extends into the detection blind hole (129).

10. The van-type pressure filter, its characterized in that: comprising the hydraulic system of claim 1.