Self-cleaning type vertical plate-and-frame filter press

Abstract

The invention provides a self-cleaning type vertical plate-and-frame filter press. The self-cleaning type vertical plate-and-frame filter press comprises a rack, a filtering mechanism, an extruding mechanism and a vertical cleaning mechanism. Wherein the rack is fixedly arranged on the ground; the filtering mechanism is arranged at one end of the rack; the extruding mechanism is arranged at one end, far away from the filtering mechanism, of the rack and is used for extruding the filtering mechanism; the vertical cleaning mechanism is vertically arranged on the rack in the vertical direction and is used for cleaning residues filtered by the filtering mechanism. The self-cleaning type vertical plate-and-frame filter press can effectively clean solid residues in equipment, and has the advantages of being good in filtering effect, high in automation degree and stable in continuous operation efficiency.

Description

Technical Field

[0001] This invention relates to the technical field of separation equipment, and in particular to a self-cleaning vertical plate and frame filter press. Background Technology

[0002] A filter press is a mechanical device used for solid-liquid separation, widely used in chemical, pharmaceutical, food processing, environmental protection and other industries. It achieves solid-liquid separation by applying pressure to force liquid through a filter medium, while solid particles are trapped on the surface of the filter medium.

[0003] During operation, a filter press pumps a mixture of solid and liquid materials into its filter chambers. The liquid flows through the gaps in the filter media to form filtrate, while solid particles form a filter cake on the media. As filtration continues, the filter cake gradually thickens until it reaches a predetermined thickness. After filtration, the pressure applied to the filter media is released, the media opens, and the filter cake falls off under gravity. This type of filter press has a simple structure and is easy to maintain. However, after prolonged operation, if the separated solid residue particles are small, filter cake agglomeration becomes more severe, potentially clogging the filter media pores and affecting the efficiency of continuous operation.

[0004] As can be seen from the above background technology, common filter presses are prone to filter cake adhesion and blockage of the filter media pores after long-term operation, which in turn affects the efficiency of continuous operation. Summary of the Invention

[0005] In view of this, the present invention aims to propose a self-cleaning vertical plate and frame filter press, which can effectively clean solid residues inside the equipment and has the advantages of good filtration effect, high degree of automation, and stable continuous operation efficiency.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows: A self-cleaning vertical plate and frame filter press includes a frame that is fixedly installed on the ground; The filtration mechanism is located at one end of the frame; An extrusion mechanism is disposed on the frame at one end away from the filter mechanism, and is used to extrude the filter mechanism; A vertical cleaning mechanism is installed vertically on the frame and is used to clean the filter residue of the filter mechanism.

[0007] Furthermore, the filtration mechanism includes a plate frame, which is configured to slide horizontally on the frame in multiple ways; the surface of the plate frame has grooves, and two adjacent plate frames can form a cavity with a filtering function when they are tightly fitted together; an inlet hole is provided at the center of the plate frame, and an outlet hole is provided at the corners. The liquid inlet pipe is connected to the liquid inlet hole at the first end of the plate frame arrangement; The liquid outlet pipe is connected to the liquid outlet hole at the first end of the plate frame arrangement.

[0008] Furthermore, sliding arms are symmetrically arranged at both ends of the plate frame, and the sliding arms are slidably mounted on the frame.

[0009] Furthermore, the extrusion mechanism includes a hydraulic cylinder disposed on the frame at one end away from the filtering mechanism; The telescopic rod is connected at one end to the hydraulic cylinder and can extend and retract under the driving action of the hydraulic cylinder; The pressure plate is connected to the end of the telescopic rod away from the hydraulic cylinder and can abut against the plate frame under the action of the telescopic rod.

[0010] Furthermore, the vertical cleaning mechanism includes a support arm that is movably mounted on the frame in the horizontal direction; The clamps are configured as two symmetrically distributed with a certain spacing, the spacing between the two clamps being consistent with the thickness of the plate frame; A connecting tube is vertically connected to the clamp and communicates with the inside of the clamp; The clamp is slidably mounted on the support arm in a vertical direction, and the ends of the plurality of connecting tubes away from the clamp are fixedly connected.

[0011] Furthermore, the vertical cleaning mechanism also includes a walking motor, which is detachably mounted on the support arm; The drive wheels are configured as a plurality of rotatable components mounted on the support arm and connected to the power output end of the walking motor; The racks are configured as two symmetrically arranged on the frame and mesh with the plurality of drive wheels.

[0012] Furthermore, the vertical cleaning mechanism also includes a lifting motor, which is detachably mounted on the top of the support arm; The driven sprocket is rotatably mounted on the support arm and is connected to the lifting motor via chain drive. The lifting plate is fixedly sleeved on the connecting pipe and slidably mounted on the support arm in the vertical direction; The lifting plate is fixedly connected to the chain between the driven sprocket and the lifting motor.

[0013] Furthermore, a roller brush is rotatably provided on the chuck, and multiple through holes are symmetrically opened on the opposite surfaces of the two chucks. The connecting pipe is connected to a compressed air source.

[0014] Furthermore, the chuck extends in the direction opposite to the frame to form an extension, and the thickness of the extension gradually increases in the direction away from the frame.

[0015] Furthermore, the hydraulic cylinder is equipped with a pressure gauge, which is connected to the interior of the hydraulic cylinder.

[0016] Compared with the prior art, the present invention has the following advantages: This invention discloses a self-cleaning vertical plate and frame filter press. The frame supports and secures other structural components, providing installation positions and limiting the movement of other mechanisms. The filtration mechanism separates the mixture entering the equipment, physically separating solids with particle diameters and filtration pore sizes from the filtrate. After the filtrate is discharged, the solids remain inside the filtration mechanism, forming a filter cake. The extrusion mechanism applies pressure to the filtration mechanism, allowing it to maintain its position under pressure. This pressure further reduces the moisture content of the filter cake, improving filtration efficiency. The extrusion mechanism releases pressure after each filtration cycle, allowing the filter cake to easily detach. The vertical cleaning mechanism automatically cleans the filtration mechanism, removing solid residues that cannot be separated from the filtration mechanism by gravity, preventing clogging. This design offers advantages such as good filtration efficiency, high automation, and stable continuous operation.

[0017] Secondly, by configuring the filtration mechanism as a plate frame, inlet pipe, and outlet pipe, the plate frame has inlet and outlet holes, and capillary channels with filtering function are set between the inlet and outlet holes. When two plate frames approach and abut each other, they form a cavity structure with filtering function. The overlapping inlet holes of multiple plate frames after approaching and abutting each other form an inlet channel, and the inlet pipe functions to transport the mixture into the inlet channel. The overlapping outlet holes of multiple plate frames after approaching and abutting each other form an outlet channel, and the outlet pipe functions to discharge the filtrate from the outlet pipe. By setting sliding arms at both ends of the plate frame, the posture stability during the relative sliding process between the plate frame and the frame can be improved.

[0018] Furthermore, by configuring the extrusion mechanism as a structure of hydraulic cylinder, telescopic rod, and pressure plate, the hydraulic cylinder drives the movement of the telescopic rod, which in turn drives the pressure plate to apply load to the filter plates. This ensures that multiple filter plates remain in their original positions during filtration, thereby aggregating solid residues in the mixture into a filter cake. The pressure plate increases the contact area between the extrusion mechanism and the filter plates, allowing the load generated by the hydraulic cylinder to be evenly distributed across the filter plates, reducing leakage between the plates. Attached Figure Description

[0019] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a self-cleaning vertical plate and frame filter press according to an embodiment of this application; Figure 2 This is a schematic diagram of the filtering mechanism structure in the embodiments of this application; Figure 3 This is a schematic diagram of the extrusion mechanism structure in an embodiment of this application; Figure 4 This is a schematic diagram of the vertical cleaning mechanism structure in the embodiments of this application.

[0020] Explanation of reference numerals in the attached figures: 1. Frame; 2. Filtration mechanism; 201. Plate and frame; 202. Inlet pipe; 203. Outlet pipe; 204. Sliding arm; 3. Extrusion mechanism; 301. Hydraulic cylinder; 302. Telescopic rod; 303. Pressure plate; 304. Pressure gauge; 4. Vertical cleaning mechanism; 401. Support arm; 402. Clamp; 403. Connecting pipe; 404. Travel motor; 405. Drive wheel; 406. Rack; 407. Lifting motor; 408. Driven sprocket; 409. Lifting plate; 410. Roller brush. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0022] In the description of this invention, it should be noted that the use of terms such as "upper," "lower," "inner," and "outer," indicating orientation or positional relationship, is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description. It does 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 the invention. Furthermore, the use of terms such as "first" and "second" is also for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] Taking a self-cleaning vertical plate and frame filter press as described in this invention as an example, the directional terms used in the embodiments, such as "up," "down," "left," "right," "front," and "back," are defined based on the vertical direction (also known as the height direction or the Z-direction), the horizontal direction (also known as the width direction or the Y-direction), and the front-back direction (also known as the length direction or the X-direction) of the self-cleaning vertical plate and frame filter press. "Inner" and "outer" are defined based on the outline of the corresponding components. For example, "inner" and "outer" are defined based on the outline of the self-cleaning vertical plate and frame filter press, with the side of the outline closer to the middle of the self-cleaning vertical plate and frame filter press being "inner," and the opposite side being "outer."

[0024] Furthermore, in the description of this invention, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention in light of the specific circumstances. The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] The following will refer to the appendix. Figure 1 To be continued Figure 4 The present invention will be described in detail with reference to the embodiments.

[0026] This embodiment relates to a self-cleaning vertical plate and frame filter press, which can effectively clean solid residues inside the equipment and has the advantages of good filtration effect, high degree of automation, and stable continuous operation efficiency.

[0027] In terms of overall structure, refer to Figure 1 This embodiment of a self-cleaning vertical plate and frame filter press includes a frame 1, a filtering mechanism 2, a pressing mechanism 3, and a vertical cleaning mechanism 4. The frame 1 is fixedly mounted on the ground. The filtering mechanism 2 is mounted on one end of the frame 1. The pressing mechanism 3 is located on the end of the frame 1 away from the filtering mechanism 2, and the pressing mechanism 3 can press the filtering mechanism 2. The vertical cleaning mechanism 4 is vertically mounted on the top of the frame 1, above the filtering mechanism 2.

[0028] The frame 1 supports and fixes the other structural components, providing installation positions and limiting the movement of other mechanisms. The filtration mechanism 2 separates and filters the mixture input into the equipment, physically separating solids with particle diameters and filtration pore sizes from the filtrate. After the filtrate is discharged from the filtration mechanism 2, the solids remain inside, forming a filter cake. The squeezing mechanism 3 applies pressure to the filtration mechanism 2, allowing it to maintain its position under pressure. Applying pressure further reduces the moisture content of the filter cake, improving the filtration efficiency. The squeezing mechanism 3 releases pressure after each filtration cycle, allowing the filtration mechanism 2 to separate and the filter cake to be easily removed. The vertical cleaning mechanism 4 automatically cleans the filtration mechanism 2, removing solid residues that cannot be separated from it by gravity, preventing clogging. This system offers advantages such as good filtration efficiency, high automation, and stable continuous operation.

[0029] Reference Figure 1 and Figure 2 The filter mechanism 2 includes a plate frame 201, an inlet pipe 202, and an outlet pipe 203. The plate frame 201 can be a rectangular plate with grooves on its surface. An inlet hole is located at the center of the plate frame 201, and outlet holes are located at its corners. Capillary channels for filtration are provided between the inlet and outlet holes. When two adjacent plate frames 201 are tightly fitted together, they can form a filtration cavity between the inlet and outlet holes. Multiple plate frames 201 are provided, all sliding horizontally on the top of the frame 1. The inlet pipe 202 communicates with the inlet hole of the first plate frame 201 in the arrangement of multiple plate frames 201, and the outlet pipe 203 communicates with the outlet hole of the first plate frame 201 in the arrangement of multiple plate frames 201. To ensure filtration efficiency, multiple outlet holes can be evenly distributed along the circumferential edge of the plate frame 201. The number of liquid outlet pipes 203 is consistent with the number of liquid outlet holes, and their installation positions correspond one-to-one.

[0030] The filter mechanism 2 is configured with a plate frame 201, an inlet pipe 202, and an outlet pipe 203. The plate frame 201 has inlet and outlet holes, and a capillary channel for filtration is provided between the inlet and outlet holes. When two plate frames 201 approach and abut against each other, they form a cavity structure with filtration function. The overlapping inlet holes of multiple plate frames 201 form an inlet channel, and the inlet pipe 202 functions to transport the mixed liquid into the inlet channel. The overlapping outlet holes of multiple plate frames 201 form an outlet channel, and the outlet pipe 203 functions to discharge the filtrate from the outlet pipe 203.

[0031] Reference Figure 1 and Figure 2 Sliding arms 204 are symmetrically arranged at both ends of the plate frame 201, and the sliding arms 204 are slidably mounted on the frame 1. By providing sliding arms 204 at both ends of the plate frame 201, the attitude stability during the relative sliding process between the plate frame 201 and the frame 1 can be improved.

[0032] Reference Figure 1 and Figure 3 The extrusion mechanism 3 includes a hydraulic cylinder 301, a telescopic rod 302, a pressure plate 303, and a pressure gauge 304. The hydraulic cylinder 301 is mounted on the frame 1 at the end furthest from the filter mechanism 2. The hydraulic cylinder 301 can extend and retract under the action of the electronic control system, thereby applying or removing loads. One end of the telescopic rod 302 is connected to the extension end of the hydraulic cylinder 301 and can move horizontally under the driving action of the hydraulic cylinder 301. The shape of the pressure plate 303 is consistent with the shape of the plate frame 201. The pressure plate 303 is mounted on the end of the telescopic rod 302 furthest from the hydraulic cylinder 301. It can abut against the plate frame 201 under the pushing action of the telescopic rod 302.

[0033] By configuring the extrusion mechanism 3 as a structure consisting of a hydraulic cylinder 301, a telescopic rod 302, and a pressure plate 303, the hydraulic cylinder 301 drives the movement of the telescopic rod 302. The telescopic rod 302 then drives the pressure plate 303 to apply load to the plate frame 201, ensuring that multiple plate frames 201 remain in their original positions during filtration, thereby aggregating solid residues in the mixture into a filter cake. The pressure plate 303 increases the contact area between the extrusion mechanism 3 and the plate frame 201, ensuring that the load generated by the hydraulic cylinder 301 is evenly distributed across the plate frame 201, reducing leakage between the plate frames 201. By installing a pressure gauge 304 connected to the internal components of the hydraulic cylinder 301, operators can easily read the internal pressure parameters, thus monitoring the overall operation of the equipment.

[0034] Reference Figure 1 and Figure 4The vertical cleaning mechanism 4 includes a support arm 401, a clamp 402, a connecting pipe 403, a travel motor 404, a drive wheel 405, a rack 406, a lifting motor 407, a driven sprocket 408, a lifting plate 409, and a roller brush 410. The support arm 401 can be a long-arm-shaped vertical structure consisting of a pair of rectangular metal plates arranged parallel to each other. The length direction of the support arm 401 is perpendicular to the horizontal plane. The support arm 401 is movably mounted on the frame 1 along the horizontal direction. There are two clamps 402. A certain distance exists between the two clamps 402. The distance between the clamps 402 is the same as the thickness of the frame 201. The two clamps 402 are symmetrically arranged. A connecting pipe 403 is vertically connected to each clamp 402. The connecting pipe 403 is a hollow tubular structure. The clamp 402 is a hollow structure. The connecting pipe 403 communicates with the interior of the clamp 402. A slide rail is provided vertically on the side of the support arm 401 near the clamp 402, and the clamp 402 is slidably disposed in the slide rail on the support arm 401. The end of the connecting pipe 403 away from the clamp 402 is fixedly connected by a connecting plate and bolts, etc., so that the two clamps 402 can slide synchronously.

[0035] Reference Figure 1 and Figure 4 The travel motor 404 is detachably mounted on the support arm 401 via bolts. Multiple drive wheels 405 are rotatably mounted on the end of the support arm 401 near the frame 1. The drive wheels 405 are gears, and their axles are connected to the power output shaft of the travel motor 404 via couplings. A rack 406 is fixedly mounted horizontally on the frame 1. The drive wheels 405 mesh with the rack 406 and, driven by the travel motor 404, can cause the support arm 401 to move parallel to the length of the rack 406.

[0036] Reference Figure 1 and Figure 4 The lifting motor 407 is detachably mounted on the top of the support arm 401 via bolts. The power output shaft of the lifting motor 407 passes through and extends to the middle of the support arm 401. A sprocket that rotates synchronously is fitted on the power output shaft of the lifting motor 407. The driven sprocket 408 is mounted on the support arm 401, located below the power output shaft of the lifting motor 407. The sprocket on the power output shaft of the lifting motor 407 and the driven sprocket 408 rotate synchronously via a chain. The lifting plate 409 is fitted on the connecting pipe 403 and fixed relative to the connecting pipe 403. The lifting plate 409 is fixedly connected to the chain that drives the driven sprocket 408 to rotate. When the driven sprocket 408 rotates, it can drive the lifting plate 409 to move vertically, thereby driving the connecting rod to move vertically.

[0037] Reference Figure 1 and Figure 4 A roller brush 410 is rotatably mounted on the chuck 402, and through holes are provided on the opposing planes of the two chucks 402. The end of the connecting pipe 403 away from the chuck 402 is connected to a clean compressed air source via a flexible hose. An extension is formed by the opposing surfaces of the two chucks 402 extending towards the frame 1. The cross-section of the extension is triangular or trapezoidal, and the thickness of the extension is configured to gradually decrease along the direction away from the frame 1.

[0038] The support arm 401 in the vertical cleaning mechanism 4 provides support and limits for other structural components, and provides installation positions for other parts. The walking motor 404, drive wheel 405, and rack 406 enable the support arm 401 to move horizontally relative to the frame 1, thus allowing adjustment of the relative position of the clamp 402 and the plate frame 201 in the horizontal direction. The lifting motor 407, driven sprocket 408, and lifting plate 409 drive the clamp 402, which is slidably mounted on the support arm 401 vertically, to move by raising and lowering the connecting rod, enabling the clamp 402 to move vertically relative to the frame 1. After a filtration operation is completed and a filter cake forms inside the plate frame 201, the clamp 402 can move relative to the frame 1 by translating and raising / lowering, thereby separating multiple interconnected plate frames 201. The compressed air source connected to the connecting pipe 403 on the chuck 402 can remove residual filter cake residue on the plate frame 201 by blowing air. The rotating brush 410 on the chuck 402, after being connected to the compressed air source via the connecting pipe 403, rotates under the pneumatic drive of the compressed air source, removing residual filter cake residue from the inner wall of the filter cavity on the plate frame 201 by scraping. By forming an extension on the chuck 402 with a thickness gradually increasing in the direction away from the frame 1, the chuck 402 can be easily inserted into the gaps between the plate frames 201, while ensuring the mechanical strength of the extension. Through the brush 410 and the blowing action, the vertical cleaning mechanism 4 can effectively reduce clogging of the filter cavity of the plate frame 201, ensuring the efficiency of continuous operation.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A self-cleaning vertical plate and frame filter press, characterized in that: Includes a frame (1), which is fixedly installed on the ground; The filter mechanism (2) is disposed at one end of the frame (1); The extrusion mechanism (3) is disposed on the frame (1) at one end away from the filter mechanism (2) and is used to extrude the filter mechanism (2). The vertical cleaning mechanism (4) is vertically installed on the frame (1) in the vertical direction and is used to clean the filter residue of the filter mechanism (2).

2. The self-cleaning vertical plate and frame filter press according to claim 1, characterized in that: The filtration mechanism (2) includes a plate frame (201), which is configured to slide along the horizontal direction on the frame (1) in multiple ways; the surface of the plate frame (201) has a groove, and two adjacent plate frames (201) can form a cavity with a filtering function after being tightly fitted together; the center of the plate frame (201) is provided with a liquid inlet hole, and the corners are provided with liquid outlet holes; The liquid inlet pipe (202) is connected to the liquid inlet hole at the first end of the plate frame (201); The liquid outlet pipe (203) is connected to the liquid outlet hole at the first end of the plate frame (201).

3. A self-cleaning vertical plate and frame filter press according to claim 2, characterized in that: The plate frame (201) is symmetrically provided with sliding arms (204) at both ends, and the sliding arms (204) are slidably disposed on the frame (1).

4. A self-cleaning vertical plate and frame filter press according to claim 2, characterized in that: The extrusion mechanism (3) includes a hydraulic cylinder (301) disposed on the frame (1) at one end away from the filter mechanism (2); The telescopic rod (302) is connected at one end to the hydraulic cylinder (301) and can extend and retract under the driving action of the hydraulic cylinder (301); The pressure plate (303) is connected to the end of the telescopic rod (302) away from the hydraulic cylinder (301) and can abut against the plate frame (201) under the action of the telescopic rod (302).

5. A self-cleaning vertical plate and frame filter press according to claim 2, characterized in that: The vertical cleaning mechanism (4) includes a support arm (401) which is movably mounted on the frame (1) in the horizontal direction; The clamps (402) are configured as two symmetrically distributed with a certain spacing, and the spacing between the two clamps (402) is consistent with the thickness of the plate frame (201); A connecting tube (403) is vertically connected to the clamp (402) and communicates with the inside of the clamp (402); The clamp (402) is slidably mounted on the support arm (401) in the vertical direction, and the ends of the plurality of connecting tubes (403) away from the clamp (402) are fixedly connected.

6. A self-cleaning vertical plate and frame filter press according to claim 5, characterized in that: The vertical cleaning mechanism (4) also includes a walking motor (404), which is detachably mounted on the support arm (401); The drive wheels (405) are configured to be rotatably mounted on the support arm (401) and connected to the power output end of the walking motor (404); The racks (406) are configured as two symmetrically arranged on the frame (1) and mesh with the plurality of drive wheels (405).

7. A self-cleaning vertical plate and frame filter press according to claim 5, characterized in that: The vertical cleaning mechanism (4) also includes a lifting motor (407), which is detachably mounted on the top of the support arm (401); The driven sprocket (408) is rotatably mounted on the support arm (401) and is connected to the lifting motor (407) by chain drive. The lifting plate (409) is fixedly sleeved on the connecting pipe (403) and slidably mounted on the support arm (401) in the vertical direction; The lifting plate (409) is fixedly connected to the chain between the driven sprocket (408) and the lifting motor (407).

8. A self-cleaning vertical plate and frame filter press according to claim 5, characterized in that: A roller brush (410) is rotatably mounted on the chuck (402), and multiple through holes are symmetrically opened on the opposite surfaces of the two chucks (402). The connecting pipe (403) is connected to the compressed air source.

9. A self-cleaning vertical plate and frame filter press according to claim 5, characterized in that: The chuck (402) extends in the direction opposite to the frame (1) to form an extension, and the thickness of the extension gradually increases in the direction away from the frame (1).

10. A self-cleaning vertical plate and frame filter press according to claim 4, characterized in that: The hydraulic cylinder (301) is equipped with a pressure gauge (304), which is connected to the interior of the hydraulic cylinder (301).

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