Desktop type two-sealing machine

Abstract

The desktop type double-sealing machine comprises a machine box and a sealing cavity installed in the middle of the machine box, and a vacuum control valve and a buffer tank are installed in the machine box and located below the sealing cavity; a cavity cover plate capable of being opened and closed is arranged on the front side of the packaging cavity, a pre-pressing mechanism, a heating upper mold mechanism and an upper bayonet mechanism are sequentially arranged on a top plate of the packaging cavity from front to back, and a battery bearing table, a heating lower mold and a diversion trench seat are sequentially arranged on a bottom plate of the packaging cavity from front to back; the prepressing mechanism is located above the battery bearing table, the heating upper die mechanism and the heating lower die are vertically opposite in position, the upper bayonet mechanism and the diversion trench seat are vertically opposite in position, a plurality of parallel diversion trenches are formed in the top face of the diversion trench seat, and the bottom of the diversion trench seat is communicated with the buffer tank through a vacuum control valve. The utility model provides a desktop type two-sealing machine which is small in occupied space and simple and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of battery processing, in particular to a desktop double-sealing machine. Background Art

[0002] Lithium batteries are high-tech green new energy products. At present, during the production process of lithium batteries, after the electrolyte is injected and the battery is subjected to a standing treatment, the excess electrolyte that has not been absorbed by the battery core and the gas generated during the production process need to be pumped out. Then, the aluminum-plastic film is heated and pressed for encapsulation in a vacuum environment, which is called double-sealing. To complete this process, a battery double-sealing machine is required. However, most of the current battery double-sealing machines on the market are composed of a combination of an upper cavity, a lower cavity, and a carrying fixture to form a large sealed cavity. Inside the cavity, there are components such as upper and lower sealing heads for encapsulation, bayonets for piercing the aluminum-plastic film, and upper and lower pressing plates for pressing air bags. Its structure is complex, it occupies a large space, it is inconvenient to move, and the operation is complex, making it difficult to meet the needs of users for manufacturing or repairing a small number of batteries. Summary of the Utility Model

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the utility model provides a desktop double-sealing machine with a simple structure, less occupied space, and simple and convenient operation.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a desktop double-sealing machine, including a machine case and a packaging cavity installed in the middle of the machine case. A vacuum control valve and a buffer tank are installed below the packaging cavity in the machine case; a cavity cover plate that can be opened and closed is provided on the front side of the packaging cavity, and the cavity cover plate is used to close or open the packaging cavity. On the top plate of the packaging cavity, a pre-pressing mechanism, a heating upper die mechanism, and an upper bayonet mechanism are successively arranged from front to back. On the bottom plate of the packaging cavity, a battery carrying platform, a heating lower die, and a diversion groove seat are successively arranged from front to back; the pre-pressing mechanism is located above the battery carrying platform and is used for pre-pressing and flattening the battery; the heating upper die mechanism and the heating lower die are relatively positioned up and down and are used for completing heating and edge sealing; the upper bayonet mechanism and the diversion groove seat are relatively positioned up and down and are used for completing piercing and draining; a plurality of parallel diversion grooves are opened on the top surface of the diversion groove seat, and the bottom of the diversion groove seat is connected to the buffer tank through a vacuum control valve to realize vacuum pumping, and the waste gas and unpermeated electrolyte in the battery core are pumped out and flow into the buffer tank through the diversion grooves.

[0005] In a preferred technical solution, the packaging cavity is composed of a top plate, a bottom plate, a cavity cover plate, a back plate, and two trapezoidal side plates arranged between the top plate and the bottom plate. The upper end of the cavity cover plate is hinged to the front end of the top plate; an opening and closing cylinder is provided on each side of the packaging cavity. One end of each opening and closing cylinder is rotatably connected to the middle part of the side surface of the cavity cover plate through a spherical plain bearing, and the other end of each opening and closing cylinder is rotatably connected to the top end of an opening and closing cylinder support seat. The bottom end of each opening and closing cylinder support seat is fixedly arranged on a mounting plate, and the mounting plate is located in the machine case below the packaging cavity.

[0006] In a preferred technical solution, the pre-pressing mechanism includes two pre-pressing cylinders and a pressing plate. The two pre-pressing cylinders are respectively arranged at both ends of the upper surface of the top plate. The pressing plate is arranged in the encapsulation cavity and above the battery carrier table. The telescopic rods of the two pre-pressing cylinders respectively pass through the top plate and are connected to both ends of the pressing plate.

[0007] In a preferred technical solution, the heating upper die mechanism includes a heating upper die, a first cylinder and a first transmission component. The first transmission component includes a first push-pull plate, two first guide rods and two first linear guide sleeves. The two first linear guide sleeves are respectively arranged at both ends of the upper surface of the top plate. The first cylinder is arranged on the top plate at the midpoint position between the two first linear guide sleeves. The two first guide rods are respectively slidably arranged in the two first guide sleeves. The middle part of the first push-pull plate is connected to the telescopic rod of the first cylinder. The upper ends of the two first guide rods are respectively fixed at both ends of the first push-pull plate, and the lower ends of the two first guide rods are respectively fixed at both ends of the heating upper die. In this technology, the heating upper die is driven by the first cylinder to move up and down flexibly along the linear guide sleeves through the two guide rods, and the accurate guiding ensures the parallelism of the battery edge sealing.

[0008] In a preferred technical solution, the upper bayonet mechanism includes a bayonet seat, a second cylinder and a second transmission component. The second transmission component includes a second push-pull plate, two second guide rods and two second linear guide sleeves. The two second linear guide sleeves are respectively arranged at both ends of the upper surface of the top plate. The second cylinder is arranged on the top plate at the midpoint position between the two second linear guide sleeves. The two second guide rods are respectively slidably arranged in the two second guide sleeves. The middle part of the second push-pull plate is connected to the telescopic rod of the second cylinder. The upper ends of the two second guide rods are respectively fixed at both ends of the second push-pull plate, and the lower ends of the two second guide rods are respectively fixed at both ends of the bayonet seat. In this technology, the bayonet seat is driven by the second cylinder to move up and down flexibly along the linear guide sleeves through the two guide rods, and the guiding is accurate.

[0009] In a preferred technical solution, the top surface of the flow guiding groove seat is an inclined surface that slopes downward from front to back, and each flow guiding groove is arranged in parallel along the inclination direction of the inclined surface, which is convenient for the exhaust gas and unpermeated electrolyte in the battery core to flow out along the flow guiding groove.

[0010] In a preferred technical solution, a start button and a touch panel are arranged at the upper part of the front surface of the chassis, and a controller is arranged inside the chassis. The controller is respectively connected to the start button, the touch panel, the opening and closing cylinder, the pre-pressing cylinder, the first cylinder, the second cylinder, the heating upper die, the heating lower die and the vacuum control valve, and can control the work of each component through the start button and the touch panel, and the operation is simple and convenient.

[0011] In a preferred technical solution, a thermostat is also arranged at the upper part of the front surface of the chassis. The thermostat is connected to the controller, and the user can set the temperatures of the heating upper die and the heating lower die through the thermostat.

[0012] In a preferred technical solution, a pressure regulating valve is provided at the lower part of the front of the chassis. The pressure regulating valve is connected to the controller, and the pressure of the pre-pressing mechanism can be controlled through the pressure regulating valve.

[0013] As can be seen from the above technical solutions, compared with the prior art, the beneficial effects of the present utility model are as follows: The present application provides a desktop double-sealing machine, which uses a packaging cavity structure to replace the traditional upper and lower mold clamping structure. The pre-pressing mechanism, upper and lower heating molds, upper bayonet mechanism and diversion groove seat are all integrated on the packaging cavity, simplifying the equipment structure, realizing a desktop design, having a small external dimension, saving space and being convenient to carry. At the same time, before packaging the battery, it is not necessary to move the upper and lower cavities to achieve closed mold clamping, but only need to close the cavity cover plate to seal the cavity, and various functions such as vacuum pumping, pneumatic pre-pressing, puncturing for liquid discharge, and heating for edge sealing can be realized by controlling components such as the pre-pressing mechanism, upper heating mold mechanism, upper bayonet mechanism and vacuum control valve, and the operation is simple and convenient.

[0014] In addition, other advantages of the present utility model will be given in the following description, and some will become obvious from the following description or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of the desktop double-sealing machine of the present utility model;

[0017] Figure 2 It is a schematic structural diagram of the packaging cavity of the present utility model;

[0018] Figure 3 It is a side view of the packaging cavity of the present utility model;

[0019] Figure 4 It is a schematic structural diagram of the chassis of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, in the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0022] Refer to Figures 1-4 Describe a desktop double-sealing machine according to an embodiment of the present utility model.

[0023] In one embodiment, as Figures 1-3 shown, a desktop double-sealing machine includes a chassis 1 and a packaging cavity 2 installed in the middle of the chassis 1. A vacuum control valve 15 and a buffer tank 16 are installed below the packaging cavity 2 in the chassis 1.

[0024] A cavity cover plate 21 that can be opened and closed is provided on the front side of the packaging cavity 2. A pre-pressing mechanism 25, a heating upper die mechanism 26, and an upper bayonet mechanism 27 are successively provided on the top plate of the packaging cavity 2 from front to rear. A battery carrier 22, a heating lower die 23, and a diversion groove seat 24 are successively provided on the bottom plate of the packaging cavity 2 from front to rear.

[0025] The pre-pressing mechanism 25 is located above the battery carrier 22. The heating upper die mechanism 26 and the heating lower die 23 are vertically opposite in position. The upper bayonet mechanism 27 and the diversion groove seat 24 are vertically opposite in position. A plurality of parallel diversion grooves are formed on the top surface of the diversion groove seat 24. The bottom of the diversion groove seat 24 is communicated with the buffer tank 16 through the vacuum control valve 15.

[0026] Among them, the cavity cover plate 21 is used to close or open the packaging cavity 2; after formation of soft-pack lithium batteries, some battery cells, especially thick battery cells, may be deformed to a certain extent due to large internal stress. The above-mentioned pre-pressing mechanism 25 is used to perform pre-pressing and flattening treatment on the battery; the heating upper die mechanism 26 and the heating lower die 23 are used to complete heating and edge sealing; the upper bayonet mechanism 27 and the diversion groove seat 24 are used to complete puncturing and liquid discharge; the vacuum control valve 15 is used to achieve vacuum pumping, and exhaust gas and unpermeated electrolyte in the battery cells are pumped out and flow into the buffer tank 16 through the diversion grooves.

[0027] In specific implementation, the cavity cover plate 21 closes to seal the encapsulation cavity 2. The pre-pressing mechanism 25 pre-presses the battery placed on the battery carrier 22, and then the upper bayonet mechanism 27 pierces the battery air bag. Then, the vacuum control valve 15 evacuates the encapsulation cavity 2, and at the same time sucks the waste gas and liquid in the battery cell into the buffer tank 16. Finally, the heating upper die mechanism 26 and the heating lower die 23 cooperate to complete the vacuum edge sealing. In practical applications, the above desktop double-sealing machine can seal one battery each time, which is very suitable for the production of a small number of batteries, such as the production of laboratory battery samples.

[0028] The desktop double-sealing machine provided in the above embodiment uses an encapsulation cavity structure instead of the traditional upper and lower die-closing structure, simplifies the equipment structure, realizes the desktop design, has a small external dimension, can save space, is convenient to carry, and can be used in different location occasions; at the same time, before encapsulating the battery, there is no need to move the upper and lower cavities to achieve closed die-closing, but only need to close the cavity cover plate 21 to seal the cavity, and realize multiple functions such as vacuum pumping, pneumatic pre-pressing, piercing and draining, and heating edge sealing, and the operation is simple and convenient.

[0029] In this embodiment, the encapsulation cavity 2 is composed of a top plate, a bottom plate, a cavity cover plate 21, and a back plate and two trapezoidal side plates arranged between the top plate and the bottom plate. The upper end of the cavity cover plate 21 is hinged to the front end of the top plate; on both sides of the encapsulation cavity 2, an opening and closing air cylinder 210 is respectively provided. One end of each opening and closing air cylinder 210 is rotationally connected to the middle part of the side surface of the cavity cover plate 21 through a spherical plain bearing, and the other end of each opening and closing air cylinder 210 is rotationally connected to the top end of the opening and closing air cylinder support seat. The bottom end of each opening and closing air cylinder support seat is fixedly arranged on a mounting plate, and the mounting plate is located in the chassis 1 below the encapsulation cavity 2.

[0030] In this embodiment, the pre-pressing mechanism 25 includes two pre-pressing air cylinders and a pressing plate. The two pre-pressing air cylinders are respectively arranged at both ends of the upper surface of the top plate. The pressing plate is arranged in the encapsulation cavity 2 and above the battery carrier 22. The telescopic rods of the two pre-pressing air cylinders respectively pass through the top plate and are connected to both ends of the pressing plate.

[0031] In this embodiment, the heating upper die mechanism 26 includes a heating upper die, a first air cylinder and a first transmission component. The first transmission component includes a first push-pull plate, two first guide rods and two first linear guide sleeves. The two first linear guide sleeves are respectively arranged at both ends of the upper surface of the top plate. The first air cylinder is arranged on the top plate at the midpoint position between the two first linear guide sleeves; the two first guide rods are respectively slidably inserted into the two first guide sleeves. The middle part of the first push-pull plate is connected to the telescopic rod of the first air cylinder. The upper ends of the two first guide rods are respectively fixed at both ends of the first push-pull plate, and the lower ends of the two first guide rods are respectively fixed at both ends of the heating upper die.

[0032] Among them, the sealing heads of the heating upper die and the heating lower die 23 can be made of copper material, which has good heat transfer effect, saves power consumption and improves work efficiency.

[0033] In the above embodiments, the heating upper die is driven by the first air cylinder to move up and down along two guide rods guided by a linear guide sleeve. The up-and-down movement is flexible, and the accurate guiding ensures the parallelism of the battery edge sealing.

[0034] In this embodiment, the upper bayonet mechanism 27 includes a bayonet seat, a second air cylinder and a second transmission assembly. The second transmission assembly includes a second push-pull plate, two second guide rods and two second linear guide sleeves. The two second linear guide sleeves are respectively arranged at both ends of the upper surface of the top plate. The second air cylinder is arranged on the top plate at the midpoint position between the two second linear guide sleeves. The two second guide rods are respectively slidably inserted into the two second guide sleeves. The middle part of the second push-pull plate is connected to the telescopic rod of the second air cylinder. The upper ends of the two second guide rods are respectively fixed at both ends of the second push-pull plate, and the lower ends of the two second guide rods are respectively fixed at both ends of the bayonet seat.

[0035] In the above embodiments, the bayonet seat is driven by the second air cylinder to move up and down along two guide rods guided by a linear guide sleeve. The up-and-down movement is flexible, and the guiding is accurate.

[0036] As a further improvement of this embodiment, the top surface of the flow guiding groove seat 24 is an inclined surface that slopes downward from front to back. Each flow guiding groove is arranged in parallel along the inclined direction of the inclined surface, which can improve the outflow speed of the waste gas and unpenetrated electrolyte in the battery cell.

[0037] In this embodiment, as Figure 4 shown, a start button 11 and a touch panel 12 are provided at the upper part of the front surface of the chassis 1. A controller is provided inside the chassis 1. The controller is respectively connected to the start button 11, the touch panel 12, the opening and closing air cylinder 210, the pre-pressing air cylinder, the first air cylinder, the second air cylinder, the heating upper die, the heating lower die 23 and the vacuum control valve 15. Among them, the touch panel 12 can be an LCD display screen, which is intuitive and convenient for operation.

[0038] As a further improvement of this embodiment, a thermostat 13 is also provided at the upper part of the front surface of the chassis 1. The thermostat 13 is connected to the controller. Specifically in implementation, the number of the thermostats 13 can be 2. The two thermostats 13 are respectively used to set the temperatures of the heating upper die and the heating lower die 23 to meet different process parameter requirements. And the current value and the set value of the temperature can be displayed through the LCD display screen, which is convenient for viewing.

[0039] As a further improvement of this embodiment, a pressure regulating valve 14 is provided at the lower part of the front surface of the chassis 1. The pressure regulating valve 14 is connected to the controller. Specifically in implementation, the number of the pressure regulating valves 14 can be 2 or more. One of the pressure regulating valves 14 is used to set the pressure of the pre-pressing mechanism 25, and the other pressure regulating valve 14 can be used to set the sealing head pressure of the heating upper die and the heating lower die 23 to meet different process parameter requirements.

[0040] Among them, the controller is preferably a PLC (Programmable Logic Controller), which ensures the control accuracy.

[0041] In the above embodiments, each component can be controlled by the start button 11 and the touch panel 12, and the operation is simple and convenient. The user can set the temperatures of the upper heating die and the lower heating die 23 through the temperature controller 13, and control the pressure of the pre-pressing mechanism 25 through the pressure regulating valve 14.

[0042] The specific working process of the above desktop double-sealing machine is as follows: Press the start button 11, and the controller controls the opening and closing cylinder 210 to drive the cavity cover plate 21 to close, so that a sealed cavity is formed inside the encapsulation cavity 2; the pre-pressing cylinder drives the pressing plate to move downward to pre-press the battery, and the pre-pressing pressure can be adjusted through the pressure regulating valve 14; the second cylinder drives the bayonet seat to puncture the battery air bag, and the vacuum control valve 15 controls the evacuation of the encapsulation cavity 2, and the waste gas and unpermeated electrolyte in the battery cell are pumped out and flow into the buffer tank 16 through the diversion groove; then the first cylinder drives the upper heating die to act in cooperation with the lower heating die 23 to complete the final edge sealing of the battery, and the temperatures of the upper heating die and the lower heating die 23 can be set through the temperature controller 13; after the encapsulation is completed, the opening and closing cylinder 210 is inflated and depressurized, driving the cavity cover plate 21 to open automatically.

[0043] The other components and operations of the desktop double-sealing machine according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

[0044] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0045] In the description of this specification, the descriptions referring to the terms "embodiment", "specific embodiment", "example", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention.

[0046] In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples without interference or contradiction.

[0047] The materials or features can be combined with each other in a suitable manner in any one or more of the embodiments or examples without interference or contradiction.

Claims

1. A desktop double sealing machine, characterized in that: It comprises a chassis and a packaging cavity installed in the middle of the chassis, wherein a vacuum control valve and a buffer tank are installed in the chassis below the packaging cavity; The front side of the packaging cavity is provided with an openable and closable cavity cover plate, the top plate of the packaging cavity is provided with a pre-pressing mechanism, a heating upper mold mechanism and an upper bayonet mechanism in sequence from front to back, and the bottom plate of the packaging cavity is provided with a battery carrying platform, a heating lower mold and a guide groove seat in sequence from front to back; The pre-pressing mechanism is located above the battery supporting platform, the heating upper mold mechanism is vertically opposite to the heating lower mold, the upper bayonet mechanism is vertically opposite to the guide groove seat, a plurality of parallel guide grooves are provided on the top surface of the guide groove seat, and the bottom of the guide groove seat is connected to the cache tank through the vacuum control valve.

2. The desktop double sealing machine according to claim 1, characterized in that: The packaging cavity is composed of the top plate, the bottom plate, the cavity cover plate, a back plate and two trapezoidal side plates arranged between the top plate and the bottom plate, and the upper end of the cavity cover plate is hinged to the front end of the top plate; An opening and closing cylinder is respectively provided on both sides of the packaging cavity, one end of each opening and closing cylinder is rotatably connected to the middle part of the side of the cavity cover plate through a joint bearing, and the other end of each opening and closing cylinder is rotatably connected to the top of the opening and closing cylinder support seat, and the bottom end of each opening and closing cylinder support seat is fixed on a mounting plate, and the mounting plate is located in the chassis below the packaging cavity.

3. The desktop double sealing machine according to claim 2, characterized in that: The pre-stressing mechanism includes two pre-stressing cylinders and a pressure plate. The two pre-stressing cylinders are respectively arranged at the two ends of the upper surface of the top plate. The pressure plate is arranged in the packaging cavity and located above the battery supporting platform. The telescopic rods of the two pre-stressing cylinders pass through the top plate and are connected to the two ends of the pressure plate.

4. The desktop double sealing machine according to claim 3, characterized in that: The heating upper mold mechanism includes a heating upper mold, a first cylinder and a first transmission assembly, the first transmission assembly includes a first push-pull plate, two first guide rods and two first linear guide sleeves, the two first linear guide sleeves are respectively arranged at both ends of the upper surface of the top plate, and the first cylinder is arranged on the top plate at the midpoint between the two first linear guide sleeves; The two first guide rods are respectively slidably arranged in the two first linear guide sleeves, the middle part of the first push-pull plate is connected to the telescopic rod of the first cylinder, the upper ends of the two first guide rods are respectively fixed to the two ends of the first push-pull plate, and the lower ends of the two first guide rods are respectively fixed to the two ends of the heated upper mold.

5. The desktop double sealing machine according to claim 4, characterized in that: The upper bayonet mechanism includes a bayonet seat, a second cylinder and a second transmission assembly, the second transmission assembly includes a second push-pull plate, two second guide rods and two second linear guide sleeves, the two second linear guide sleeves are respectively arranged at both ends of the upper surface of the top plate, and the second cylinder is arranged on the top plate at the midpoint between the two second linear guide sleeves; The two second guide rods are respectively slidably arranged in the two second linear guide sleeves, the middle part of the second push-pull plate is connected to the telescopic rod of the second cylinder, the upper ends of the two second guide rods are respectively fixed to the two ends of the second push-pull plate, and the lower ends of the two second guide rods are respectively fixed to the two ends of the bayonet seat.

6. The desktop double sealing machine according to any one of claims 1 to 5, characterized in that: The top surface of the guide groove seat is an inclined surface that slopes downward from front to back, and each of the guide grooves is arranged in parallel along the inclined direction of the inclined surface.

7. The desktop double sealing machine according to claim 5, characterized in that: A start button and a touch panel are provided on the upper front portion of the chassis, and a controller is provided inside the chassis; the controller is respectively connected to the start button, the touch panel, the opening and closing cylinder, the pre-compression cylinder, the first cylinder, the second cylinder, the heated upper mold, the heated lower mold and the vacuum control valve.

8. The desktop double sealing machine according to claim 7, characterized in that: A temperature controller is also provided on the upper front part of the chassis, and the temperature controller is connected to the controller.

9. The desktop double sealing machine according to claim 8, characterized in that: A pressure regulating valve is provided at the front lower part of the chassis, and the pressure regulating valve is connected to the controller.

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