Aluminum die-casting die

Abstract

The invention discloses an aluminum die-casting die which comprises a movable die assembly, a fixed die assembly, a core pin and an extrusion oil cylinder. The movable mold assembly comprises a movable mold frame and a movable mold core; the fixed mold assembly comprises a fixed mold frame and a fixed mold core; the extrusion oil cylinder comprises a cylinder body and an extrusion part; the fixed die frame is provided with a groove for containing the cylinder body, the fixed die core is provided with a through hole for the extrusion component to penetrate through, the section of the groove is larger than that of the through hole, and the cylinder body is fixed in the groove. The core pin penetrates through the fixed mold core, the end A of the core pin abuts against the inner wall of the movable mold core towards the inner wall of the fixed mold core, the fixed mold core is provided with a via hole for the core pin to penetrate through, and the end B of the core pin penetrates through the via hole backwards to the outer wall of the fixed mold core and abuts against the inner surface of the cylinder body; when a worker replaces the core pin, the core pin can be pulled out only by disassembling the extrusion oil cylinder from the fixed die assembly, the disassembly and assembly procedure of the core pin is simplified, and the combination efficiency of the aluminum die-casting die is improved.

Description

[0001] This application is a divisional application of the invention patent application with the application date of October 20, 2020, application number 202011122476.4, and the invention name is extrusion cylinder and aluminum die-casting mold. Technical Field

[0002] The invention belongs to the technical field of aluminum die-casting molds, and relates to an aluminum die-casting mold, in particular to an extrusion cylinder. Background Art

[0003] In the aluminum die-casting production process, in order to improve the internal quality of the casting and reduce casting defects, it is usually necessary to extrude the liquid die-casting material to make the internal structure of the casting more compact. Therefore, it is necessary to use an extrusion cylinder to push the extrusion core into the liquid die-casting material for extrusion.

[0004] Since aluminum die-casting is a high-temperature operation, the extrusion cylinder is located inside the die-casting mold, with poor heat dissipation effect. It is easy to expand due to heat and get stuck, causing the cylinder to fail to move, resulting in the inability to achieve local extrusion. The products produced cannot meet internal quality requirements and need to be dismantled for correction. This affects product quality while also greatly affecting production efficiency.

[0005] The patent document with authorization announcement number CN 204194756 U discloses an extrusion cylinder structure in a die-casting mold. By changing the cylinder piston rod structure, cooling water is passed through the cylinder piston rod, the connecting head, and the extrusion pin to achieve cooling of the extrusion cylinder.

[0006] However, this technical solution has only one cooling water channel, and the cooling effect is poor. The extrusion cylinder still has the problem of getting stuck, which affects the stability and service life of the extrusion cylinder. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an aluminum die-casting mold with an extrusion cylinder.

[0008] The technical solution adopted by the present invention to solve the above technical problems is: an aluminum die-casting mold comprises a movable mold component, a fixed mold component, a core pin and an extrusion cylinder;

[0009] The movable mold assembly includes a movable mold frame and a movable mold core; the fixed mold assembly includes a fixed mold frame and a fixed mold core;

[0010] The extrusion cylinder comprises a cylinder body and an extrusion component;

[0011] The fixed mold frame is provided with a groove for accommodating the cylinder body, the fixed mold core is provided with a through hole for the extrusion component to pass through, the cross section of the groove is larger than the cross section of the through hole, and the cylinder body is fixed in the groove;

[0012] The core pin passes through the fixed mold core, the A end of the core pin passes through the inner wall of the fixed mold core forward and presses against the inner wall of the movable mold core, the fixed mold core is provided with a through hole for the core pin to pass through, the B end of the core pin passes through the through hole backward to the outer wall of the fixed mold core and presses against the inner surface of the cylinder body;

[0013] The cylinder body is provided with a piston part which performs piston motion in the cylinder body, and the extrusion component comprises an extrusion pin and an extrusion sleeve which are coaxially connected to the front end of the piston part;

[0014] The extrusion sleeve is sleeved on the outside of the extrusion pin, the rear end of the extrusion sleeve is fixedly connected to the front end of the cylinder body, and the extrusion pin can extend from the front end of the extrusion sleeve;

[0015] The extrusion sleeve includes a guide section at the front side and a heat dissipation section at the rear side; the guide section and the extrusion pin are clearance-matched to achieve a guiding function; a cavity with heat insulation and heat dissipation functions is formed between the heat dissipation section and the extrusion pin;

[0016] A second cooling pipeline is arranged between the piston part and the extrusion pin to cool both of them at the same time. The second cooling pipeline includes a cooling cavity connecting the piston part and the extrusion pin, a second water inlet and a second water outlet. The cooling water enters the cooling cavity from the second water inlet and flows out from the second water outlet to take away the heat.

[0017] The preferred technical solution adopted by the present invention to solve the above technical problem is: the inner diameter of the heat dissipation section is 1.5-3 times the inner diameter of the guide section.

[0018] The preferred technical solution adopted by the present invention to solve the above technical problems is: the second water inlet and the second water outlet are arranged at the rear section of the piston part, and the cooling cavity extends from the rear section of the piston part to the front section of the extrusion pin.

[0019] The preferred technical solution adopted by the present invention to solve the above technical problems is: it also includes a water pipe located in the cooling cavity, the water pipe is connected to the second water inlet and extends inward to the front end of the cooling cavity to divert cooling water to the front end of the extrusion pin.

[0020] The preferred technical solution adopted by the present invention to solve the above technical problem is: the piston part and the extrusion pin are threadedly connected, and an O-ring seal is arranged between the piston part and the extrusion pin.

[0021] The preferred technical solution adopted by the present invention to solve the above technical problems is: the piston part includes a piston rod moving in the cylinder body and a connecting head at the rear end of the piston rod, the connecting head is located outside the cylinder body, and the second water inlet and the second water outlet are arranged on the connecting head.

[0022] The preferred technical solution adopted by the present invention to solve the above technical problem is: a mounting groove for accommodating the connecting head is provided on the rear side of the cylinder body.

[0023] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is: the installation groove extends to the upper surface of the cylinder body, the second water inlet and the second water outlet are arranged on the upper surface of the connecting head, and the water pipe connecting the second water inlet and the second water outlet is led out from the groove of the installation groove located on the upper surface of the cylinder body.

[0024] Compared with the prior art, the advantage of the present invention is that when a worker replaces the core pin, he only needs to remove the extrusion cylinder from the fixed die assembly to pull out the core pin, which simplifies the process of disassembling and assembling the core pin and improves the assembly efficiency of the aluminum die-casting mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0026] Figure 1 Schematic diagram of an aluminum die-casting mold according to a preferred embodiment of the present invention Figure 1 ;

[0027] Figure 2 Schematic diagram of an aluminum die-casting mold according to a preferred embodiment of the present invention Figure 2 ;

[0028] Figure 3 Schematic diagram of an aluminum die-casting mold according to a preferred embodiment of the present invention Figure 3 ;

[0029] Figure 4 The explosion of the aluminum die casting mold of a preferred embodiment of the present invention Figure 1 ;

[0030] Figure 5 The explosion of the aluminum die casting mold of a preferred embodiment of the present invention Figure 2 ;

[0031] Figure 6 The explosion of the aluminum die casting mold of a preferred embodiment of the present invention Figure 3 ;

[0032] Figure 7 A schematic diagram of an extrusion cylinder according to a preferred embodiment of the present invention Figure 1 ;

[0033] Figure 8 A schematic diagram of an extrusion cylinder according to a preferred embodiment of the present invention Figure 2 ;

[0034] Fig. 9 A schematic diagram of an extrusion cylinder according to a preferred embodiment of the present invention Figure 3 ;

[0035] Fig.10 A preferred embodiment of the present invention Fig. 9 Schematic diagram of the cross section at AA;

[0036] Fig.11 An exploded view of an extrusion cylinder according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are only illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0038] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0039] In the description of the present invention, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed", "connected", etc. 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] As shown in Figures 1-2, the aluminum die-casting mold includes a movable mold assembly 100 and a fixed mold assembly 200.

[0042] like Figure 4-6As shown, the movable mold assembly 100 includes a movable mold frame 01 and a movable mold core 02; the fixed mold assembly 200 includes a fixed mold frame 03 and a fixed mold core 04. The movable mold core 02 is arranged on the inner side of the movable mold frame 01 through a guide structure, and the fixed mold core 04 is fixed to the inner side of the fixed mold frame 03 by screws. When the movable mold core 02 and the fixed mold core 04 are closed, there is a certain gap to form a casting mold cavity.

[0043] In addition, the aluminum die-casting mold further includes a core pin 05, which is penetrated in the casting cavity, thereby forming a truncation area in the casting cavity to form a hole-like structure on the aluminum die-casting.

[0044] In addition, a pouring part 06 with a pouring port is provided on the fixed mold assembly 200. The pouring part 06 enters the pouring mold cavity from the fixed mold frame 03 through the fixed mold core 04. In the actual production process, after the mold is closed, the feeding system injects high-temperature aluminum liquid from the pouring port of the pouring part 06 into the pouring mold cavity, and then cools and maintains pressure to form an aluminum die casting.

[0045] like Figure 1-6 As shown, in this embodiment, in order to improve the intrinsic quality of the casting and reduce casting defects, an extrusion cylinder 300 is also provided in the aluminum die-casting mold.

[0046] like Figure 1-6 As shown, combined Figure 7 As shown, the extrusion cylinder 300 includes a cylinder body 301 and an extrusion component 302. The cylinder body 301 is fixed on the fixed die assembly 200, and the extrusion cylinder 300 is used to push the extrusion component 302 into the liquid die-casting material for extrusion, so that the internal structure of the casting is more compact.

[0047] In the traditional aluminum die-casting mold technology, the extrusion cylinder 300 is usually installed on the fixed mold frame 03 through a huge mounting plate, and one end of the core pin 05 is against the inner wall of the movable mold core 02, and the other end passes through the fixed mold core 04 and is fixed to the fixed mold frame 03. Therefore, when removing the core pin 05, the worker needs to remove the extrusion cylinder 300 first, and then remove the core pin 05 after removing the entire movable mold frame 01. Conversely, the above steps need to be repeated during installation. The disassembly and assembly process of the core pin 05 is complicated and cumbersome, and consumes manpower and material resources. In addition, since aluminum die-casting is a high-temperature operation, the core pin 05 is completely immersed in high-temperature liquid; and during the demolding process, friction occurs between the core pin 05 and the formed aluminum die-casting, so the core pin 05 is very easy to wear and needs to be replaced frequently. The complicated disassembly and assembly operations will greatly reduce the efficiency of aluminum die-casting.

[0048] In this embodiment, Figure 1-6 As shown, the fixed mold frame 03 is provided with a groove 001 for accommodating the cylinder body 301 , and the fixed mold core 04 is provided with a through hole T for the extrusion component 302 to pass through. The cross section of the groove 001 is larger than the cross section of the through hole T, and the cylinder body 301 is fixed in the groove 001 .

[0049] The A end of the core pin 05 presses against the inner wall of the movable mold core 02, and the B end of the core pin 05 presses against the inner surface of the cylinder body 301 of the extrusion cylinder 300; after the extrusion cylinder 300 is removed from the fixed mold frame 03, the core pin 05 can be pulled out from the fixed mold frame 03. Therefore, when replacing the core pin 05, the worker only needs to remove the extrusion cylinder 300 from the fixed mold assembly to pull out the core pin 05, which simplifies the process of disassembling and assembling the core pin 05 and improves the assembly efficiency of the aluminum die-casting mold.

[0050] Specifically, the core pin 05 passes through the fixed mold core 04, and the A end of the core pin 05 passes through the inner wall of the fixed mold core 04 forward and presses against the inner wall of the movable mold core 02. The fixed mold core 04 is provided with a through hole Q for the core pin 05 to pass through, and the B end of the core pin 05 passes through the through hole Q backward to the outer wall of the fixed mold core 04 and presses against the inner surface of the cylinder body 301. In this embodiment, there are two core pins 05.

[0051] The cylinder body 301 is fixed to the outer surface of the fixed mold core 04 at the bottom of the groove 001 by screws. Further preferably, 4 sets of screws are fixed to the four corners of the cylinder body 301 to ensure the stability of the extrusion cylinder 300 when working and to facilitate the disassembly and assembly of the extrusion cylinder 300 as much as possible.

[0052] More preferably, when the extrusion cylinder 300 is assembled in place, the rear surface of the cylinder body 301 is flush with the rear surface of the fixed mold frame 03, or the rear surface of the cylinder body 301 is located inside the rear surface of the fixed mold frame 03, thereby avoiding the extrusion cylinder interfering with the installation of the aluminum die-casting mold on the die-casting equipment.

[0053] like Figure 7-11 As shown, as a specific embodiment of the extrusion oil cylinder 300, the peripheral side of the cylinder body 301 is provided with a cylinder joint X. The cylinder body 301 of the extrusion oil cylinder 300 is provided with a piston part 07, and the extrusion component 302 includes an extrusion pin 08 coaxially connected to the front end of the piston part 07 and an extrusion sleeve 09, the extrusion sleeve 09 is sleeved outside the extrusion pin 08, the rear end of the extrusion sleeve 09 is fixed to the front end of the cylinder body 301, and the extrusion pin 08 can extend from the front end of the extrusion sleeve 09.

[0054] Among them, in combination Figure 4-6 The extrusion sleeve 09 passes through the fixed mold core 04 from the through hole T on the fixed mold core 04 at the bottom of the groove 001 and enters the inner surface of the fixed mold core 04, and together with the fixed mold core 04 and the movable mold core 02, forms a casting mold cavity. The extrusion pin 08 can be extended or retracted into the extrusion sleeve 09 under the action of the piston part 07, so as to realize the extrusion and release of the liquid in the casting mold cavity.

[0055] like Fig.10As shown, preferably, the extrusion sleeve 09 includes a guide section 091 on the front side and a heat dissipation section 092 on the rear side. The inner diameter of the heat dissipation section 092 is 1.5-3 times the inner diameter of the guide section 091. The guide section 091 is clearance-matched with the extrusion pin 08 to achieve a guiding effect, reduce the oscillation of the forward and backward movement of the extrusion pin 08, and improve the stability of the extrusion operation. A cavity K with heat insulation and heat dissipation effects is formed between the heat dissipation section 092 and the extrusion pin 08. This cavity prevents direct contact between the fixed mold core 04 and the extrusion pin 08, reduces the heat transfer efficiency between the two, and prevents the extrusion pin 08 from being heated by the fixed mold core 04; and the heat of the extrusion pin 08 can be conducted to this cavity K, thereby reducing its own heat.

[0056] As a preferred implementation mode, Figure 7-11 As shown, in this embodiment, the cylinder body 301 is provided with a first cooling pipeline capable of cooling the cylinder body 301, and the first cooling pipeline includes a cooling channel inside the cylinder body 301, a first water inlet 11 and a first water outlet 12; cooling water enters the cylinder body 301 from the first water inlet 11, flows through the cooling channel and then flows out from the first water inlet 11.

[0057] A second cooling pipeline is provided between the piston portion 07 and the extrusion pin 08 to cool both of them at the same time. The second cooling pipeline includes a cooling cavity 15 connecting the piston portion 07 and the extrusion pin 08, a second water inlet 13 and a second water outlet 14. The cooling water enters the cooling cavity 15 from the second water inlet 13 and flows out from the second water outlet 14 to take away the heat.

[0058] Through the two cooling systems, not only the piston 07 in the cylinder 301 is indirectly cooled by cooling the cylinder 301, so as to avoid the piston 07 and the cylinder 301 from expanding and failing after the extrusion oil cylinder 300 is operated, but also the piston 07 and the extrusion pin 08 are directly cooled, so as to avoid the extrusion pin 08 from expanding due to heat. The cooling effect is better, the probability of the extrusion oil cylinder 300 getting stuck is greatly reduced, and the stability and service life of the aluminum die-casting mold are improved.

[0059] The second water inlet 13 and the second water outlet 14 are arranged at the rear section of the piston part 07, and the cooling cavity 15 extends from the rear section of the piston part 07 to the front section of the extrusion pin 08. The cooling water enters the cooling cavity 15 from the second water inlet 13 and diffuses to the front section of the extrusion pin 08 to cool the entire extrusion pin 08, especially to effectively cool the head of the extrusion pin 08.

[0060] In addition, the extrusion cylinder 300 also includes a water pipe 16 in the cooling chamber 15, which is connected to the second water inlet 13 and extends inward to the front end of the cooling chamber 15 to guide the cooling water to the front end of the extrusion pin 08, thereby more effectively transporting the cooling water with the lowest temperature to the front end of the extrusion pin 08 with the highest temperature, more effectively taking away the heat from the front end of the extrusion pin 08, and efficiently reducing the temperature of the extrusion pin 08.

[0061] It should be understood that after the cooling water is discharged from the front end of the water pipe 16 to the cooling chamber 15, the cooling water is diffused along the inner wall of the cooling chamber 15 at the front end of the extrusion pin 08, and is pressed to the gap between the water pipe 16 and the inner wall of the extrusion pin 08, and finally flows out from the second water outlet 14 connected to the gap, thereby realizing heat exchange between the cooling water and the aluminum die-casting mold.

[0062] Preferably, the piston portion 07 and the extrusion pin 08 are threadedly connected, and an O-ring seal is provided between the piston portion 07 and the extrusion pin 08 to achieve radial sealing.

[0063] More preferably, the piston portion 07 includes a piston rod 071 moving in the cylinder body 301 and a connecting head 072 at the rear end of the piston rod 071 , the connecting head 072 is located outside the cylinder body 301 , and the second water inlet 13 and the second water outlet 14 are arranged on the connecting head 072 .

[0064] In order to make the structure compact and make it easier for the extrusion cylinder 300 to be assembled on the aluminum die-casting mold, a mounting groove M for accommodating the coupling head 072 is provided on the rear side of the cylinder body 301.

[0065] The mounting groove M extends to the upper surface of the cylinder body 301, the second water inlet 13 and the second water outlet 14 are arranged on the upper surface of the connecting head 072, and the water pipe (not shown in the figure) connecting the second water inlet 13 and the second water outlet 14 is led out from the groove of the mounting groove M located on the upper surface of the cylinder body 301.

[0066] Further preferably, the first water inlet 11 and the first water outlet 12 are arranged on the side surface of the cylinder body 301, and the water pipes F1 and F2 connecting the first water inlet 11 and the first water outlet 12 extend outward from both sides of the cylinder body 301 respectively, so that the water pipes F1 and F2 at the first water inlet 11 and the first water outlet 12 and the water pipes at the second water inlet 13 and the second water outlet 14 (not shown in the figure) are in two perpendicular directions to avoid mutual interference and heat transfer between the water pipes, so as to make the structural layout of the aluminum die-casting mold more reasonable.

[0067] like Figure 2 , 3As shown, further, strip grooves L are provided on the fixed mold frame 03 on both sides of the groove 001 for installing the extrusion cylinder 300, which pass through the groove 001 to the edges on both sides of the fixed mold frame 03. The water pipes F1 and F2 connecting the first water inlet 11 and the first water outlet 12, and the water pipes at the second water inlet 13 and the second water outlet 14 can all be accommodated on the strip grooves L, thereby making the aluminum die-casting mold more compact and neat.

[0068] like Figure 1-2 As shown, in addition, in order to facilitate the lifting of the aluminum die-casting mold, a lifting ring 400 is also provided on the side wall of the fixed mold frame for connecting with a lifting device to realize mechanical operation.

[0069] The above is a detailed introduction to the extrusion cylinder and aluminum die-casting mold provided by the present invention. The principle and implementation method of the present invention are described in detail using specific examples. The description of the above embodiments is only used to help understand the present invention and its core ideas. It should be pointed out that for ordinary technicians in this technical field, the present invention can also be improved and modified without departing from the principle of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. Aluminum die casting mold, characterized by: It includes a movable mold assembly, a fixed mold assembly, a core pin and an extrusion cylinder; The movable mold assembly includes a movable mold frame and a movable mold core; the fixed mold assembly includes a fixed mold frame and a fixed mold core; The extrusion cylinder comprises a cylinder body and an extrusion component; The fixed mold frame is provided with a groove for accommodating the cylinder body, the fixed mold core is provided with a through hole for the extrusion component to pass through, the cross section of the groove is larger than the cross section of the through hole, and the cylinder body is fixed in the groove; The core pin passes through the fixed mold core, the A end of the core pin passes through the inner wall of the fixed mold core forward and presses against the inner wall of the movable mold core, the fixed mold core is provided with a through hole for the core pin to pass through, the B end of the core pin passes through the through hole backward to the outer wall of the fixed mold core and presses against the inner surface of the cylinder body; The cylinder body is provided with a piston part which performs piston motion in the cylinder body, and the extrusion component comprises an extrusion pin and an extrusion sleeve which are coaxially connected to the front end of the piston part; The extrusion sleeve is sleeved on the outside of the extrusion pin, the rear end of the extrusion sleeve is fixedly connected to the front end of the cylinder body, and the extrusion pin can extend from the front end of the extrusion sleeve; The extrusion sleeve includes a guide section at the front side and a heat dissipation section at the rear side; the guide section and the extrusion pin are clearance-matched to achieve a guiding function; a cavity with heat insulation and heat dissipation functions is formed between the heat dissipation section and the extrusion pin; A second cooling pipeline is arranged between the piston part and the extrusion pin to cool both of them at the same time. The second cooling pipeline includes a cooling cavity connecting the piston part and the extrusion pin, a second water inlet and a second water outlet. The cooling water enters the cooling cavity from the second water inlet and flows out from the second water outlet to take away the heat.

2. The aluminum die casting mold according to claim 1, characterized in that The inner diameter of the heat dissipation section is 1.5-3 times the inner diameter of the guide section.

3. The aluminum die casting mold according to claim 1, characterized in that The second water inlet and the second water outlet are arranged at the rear section of the piston part, and the cooling cavity extends from the rear section of the piston part to the front section of the extrusion pin.

4. The aluminum die casting mold according to claim 2, characterized in that It also includes a water pipe located in the cooling cavity, the water pipe is connected to the second water inlet and extends inward to the front end of the cooling cavity to guide the cooling water to the front end of the extrusion pin.

5. The aluminum die casting mold according to claim 1, characterized in that The piston part is threadedly connected to the extrusion pin, and an O-shaped sealing member is arranged between the piston part and the extrusion pin.

6. The aluminum die casting mold according to claim 1, characterized in that The piston part includes a piston rod moving in the cylinder body and a connecting head at the rear end of the piston rod, the connecting head is located outside the cylinder body, and the second water inlet and the second water outlet are arranged on the connecting head.

7. The aluminum die casting mold according to claim 5, characterized in that The rear side of the cylinder body is provided with a mounting groove for accommodating the coupling head.

8. The aluminum die casting mold according to claim 6, characterized in that The mounting groove extends to the upper surface of the cylinder body, the second water inlet and the second water outlet are arranged on the upper surface of the connecting head, and the water pipe connecting the second water inlet and the second water outlet is led out from the groove of the mounting groove located on the upper surface of the cylinder body.

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