Cylinder for injection molding with stroke slowdown function

Abstract

The present invention relates to an air cylinder for injection molding with a function of slowing down the stroke, belonging to the technical field of injection molding, and solves the problem of how to stably realize the function of slowing down the stroke of the air cylinder. The present invention includes a travel switch buffer device. The travel switch buffer device includes a connecting seat arranged on the outer wall of the cylinder body. The connecting seat is provided with a first fluid connection hole and a second fluid connection hole. The first fluid connection hole and the first cavity are communicated through a first fluid channel on the cylinder body. The second fluid connection hole and the second cavity are communicated through a second fluid channel on the cylinder body. The second fluid connection hole is provided with a detachable throttle head, and the end of the throttle head connected to the second fluid connection hole is provided with a throttle channel with a diameter less than 1 mm. Through a series of settings, the present invention stably realizes the slowing down of the air cylinder stroke in a pure mechanical manner, with a simple structure and low manufacturing cost, and can also adjust the stroke speed according to actual production needs.

Description

Technical Field

[0001] The present invention belongs to the technical field of injection molding, and relates to a cylinder for injection molding, in particular to an injection molding cylinder with a function of slowing down the stroke. Background Art

[0002] When molten plastic is injected into the mold cavity and cooled, the mold is then opened and the product is taken out. For molds with high requirements for product quality, slow mold opening is required, that is, the cylinder stroke needs to be slowed down when opening or closing, so as to stably reduce the impact and vibration caused by the mold opening inertia with a slow speed. However, the existing technologies mainly focus on using throttle valves. The Chinese invention patent [Application No.: CN201610580194.6] discloses a cylinder speed regulating device suitable for a wide stroke range, including: check valve I, check valve II, throttle valve I, throttle valve II, cylinder, electromagnetic switch valve I, controller, electromagnetic switch valve II and electromagnetic switch valve III. The electromagnetic switch valve I is respectively connected to the check valve I and the check valve II, and the check valve I and the check valve II are respectively connected to the rodless cavity and the rod cavity of the cylinder. Both check valves are conductive when the gas flows into the cylinder. A bypass circuit is connected between the check valve II and the rodless cavity, and this bypass circuit is composed of the electromagnetic switch valve III and the throttle valve II in series. Similarly, a bypass circuit of the same structure is also connected between the check valve I and the rod cavity. The present invention can regulate the speed of a short-stroke cylinder, and also has the advantages of a wide speed regulation range and stepless speed regulation. However, since the flow rate of the throttle valve depends not only on the size of the throttle orifice area, but also on the pressure difference before and after the throttle orifice, and the stiffness of the valve is small, it is only applicable to the occasions where the load of the actuator changes very little and the requirement for speed stability is not high.

[0003] Therefore, how to stably achieve the function of slowing down the cylinder stroke has become an urgent problem to be solved. Summary of the Invention

[0004] The object of the present invention is to provide an injection molding cylinder with a function of slowing down the stroke for the above problems.

[0005] To achieve the above object, the present invention adopts the following technical solutions: An injection molding cylinder with a stroke slowdown function, comprising a cylinder body provided with a cylinder body base, a piston slidable up and down is arranged inside the cylinder body, the piston is connected to a piston rod, the bottom surface of the piston away from the piston rod and the cylinder body enclose a first cavity, a detachable output shaft is arranged on the piston rod, a sealing ring assembly is arranged at the upper end of the cylinder body, the sealing ring assembly, the cylinder body, the piston and the piston rod enclose a second cavity, and further comprising a travel switch buffer device, the travel switch buffer device includes a connecting seat arranged on the outer wall of the cylinder body, the connecting seat is provided with a first fluid connection hole and a second fluid connection hole, the first fluid connection hole and the first cavity are communicated through a first fluid channel on the cylinder body, the second fluid connection hole and the second cavity are communicated through a second fluid channel on the cylinder body, the second fluid connection hole is connected to a throttle head, and the throttle head is provided with a throttle channel with an inner diameter less than 1 mm at one end connected to the second fluid connection hole.

[0006] In the above injection molding cylinder with a stroke slowdown function, the throttle head includes a fluid port and a throttle head body, the throttle head body and the fluid port are connected through a fastening device, the throttle head body is connected to the second fluid connection hole, the throttle channel is arranged at one end of the throttle head body not connected to the fluid port, and the inner diameter of the throttle channel is 0.1 mm - 0.5 mm.

[0007] In the above injection molding cylinder with a stroke slowdown function, the throttle head body includes a first throttle cavity and a second throttle cavity, the first throttle cavity and the second throttle cavity are connected through a throttle adjustment device, the throttle channel is arranged in the first throttle cavity, and the inner diameter of the first throttle cavity is smaller than the inner diameter of the second throttle cavity.

[0008] In the above injection molding cylinder with a stroke slowdown function, the sealing ring assembly includes a cooling water jacket, the cooling water jacket takes the piston rod as the axis, the piston rod is slidably connected to the cooling water jacket, a plurality of piston rod sealing grooves provided with sealing rings and dust-proof rings are arranged at the part where the inner side of the cooling water jacket is in contact with the piston rod, a second cavity sealing groove provided with a lubricating sealing ring is arranged at the part where the outer side of the cooling water jacket is in contact with the cylinder body, a cooling groove is arranged inside the cooling water jacket, and the cooling water jacket is fixedly connected to the cylinder body.

[0009] In the above injection molding cylinder with a stroke slowdown function, the cooling groove is provided with reinforcing ribs, cooling groove through holes are arranged on both sides of the reinforcing ribs of the cooling water jacket, and the cooling groove through holes are arranged above the cylinder body.

[0010] In the above-mentioned cylinder for injection molding with a stroke slowdown function, the cooling water jacket further includes a base composed of a support part and a relief part. The base and the cooling water jacket form a second cavity sealing groove. The relief part is formed by the relief at one end where the base is connected to the cylinder body. The relief part, the cylinder body, and the piston enclose a second cavity. On the surface of the support part that contacts the piston, several intake auxiliary grooves of the second cavity are provided.

[0011] In the above-mentioned cylinder for injection molding with a stroke slowdown function, a process hole is provided at the axial center position of the bottom surface of the piston, and a piston lubrication groove with a sealing ring is provided on the side surface of the piston.

[0012] In the above-mentioned cylinder for injection molding with a stroke slowdown function, a convex part is provided on the bottom surface of the piston, and a chamfer is provided at the position where the convex part is connected to the threaded hole.

[0013] In the above-mentioned cylinder for injection molding with a stroke slowdown function, an output shaft mounting seat is provided on the piston rod. The output shaft includes an output shaft base. The output shaft mounting seat is provided with a limiting structure for the output shaft base, and the output shaft mounting seat is also provided with an output shaft protection ring.

[0014] In the above-mentioned cylinder for injection molding with a stroke slowdown function, the throttle head is connected to the one-way throttle valve. An installation table fixedly connected to the cooling water jacket is provided on the cooling water jacket. The output shaft protection ring and the installation table form an anti-rotation structure.

[0015] Compared with the existing technology, the advantages of the present invention are as follows:

[0016] 1. Through a series of settings, the present invention stably realizes the slowdown of the cylinder stroke in a pure mechanical manner. The structure is simple, the manufacturing cost is low, and the stroke speed can also be adjusted according to actual production needs.

[0017] 2. While slowing down the cylinder stroke, the present invention also buffers and protects the end of the cylinder stroke, prolongs the service life of the cylinder, and reduces the actual production cost.

[0018] 3. Many parts of the present invention are set as structures convenient for inspection and replacement, which not only ensures the stroke quality of the cylinder, but also ensures the safety of the operation and reduces the consumption cost during the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram provided by the present invention;

[0020] Figure 2 is Figure 1 a schematic structural diagram in another direction;

[0021] Figure 3 is Figure 1 a sectional view of;

[0022] Figure 4 is a structural schematic diagram of a part of the present invention;

[0023] Figure 5 is Figure 4 a sectional view of;

[0024] Figure 6 is a sectional view of a part;

[0025] Figure 7 is a structural schematic diagram of a part of the present invention;

[0026] Figure 8 is Figure 7 a sectional view of;

[0027] Figure 9 is Figure 7 a structural schematic diagram in another direction;

[0028] Figure 10 is a structural schematic diagram of another part of the present invention;

[0029] Figure 11 is Figure 9 a sectional view of;

[0030] In the figure, cylinder block base 1, cylinder block 2, piston 3, piston rod 4, first cavity 21, output shaft 5, seal ring assembly 6, second cavity 22, travel switch buffer device 7, connection seat 71, first fluid connection hole 711, second fluid connection hole 712, first fluid passage 23, second fluid passage 24, throttle head 72, throttle passage 721, fluid outlet 722, throttle head body 723, fastening device 724, first throttle cavity 723a, second throttle cavity 723b, throttle adjustment device 723c, cooling water jacket 61, seal groove 611, second cavity seal groove 612, cooling groove 613, reinforcing rib 614, cooling groove through hole 615, support portion 616, relief portion 617, base 62, intake auxiliary groove 618, gasket groove 31, gasket 32, piston lubrication groove 33, cylinder block protective shell 8, mounting seat 81, connection seat mounting groove 82, output shaft mounting seat 41, output shaft base 51, limiting structure 41, output shaft protective ring 412, mounting platform 9. Specific Embodiments

[0031] The technical solution of the present invention will be further specifically described below through embodiments in conjunction with the accompanying drawings.

[0032] Embodiment 1

[0033] As Figures 1-3As shown in the figure, an air cylinder for injection molding with a function of slowing down the stroke includes a cylinder body 2 provided with a cylinder body base 1. A piston 3 that can slide up and down is arranged inside the cylinder body 2. The piston 3 is connected to a piston rod 4. The bottom surface of the piston 3 far from the piston rod 4 and the cylinder body 2 enclose a first cavity 21. A detachable output shaft 5 is provided on the piston rod 4. A sealing ring assembly 6 is arranged at the upper end of the cylinder body 2. The sealing ring assembly 6, the cylinder body 2, the piston 3 and the piston rod 4 enclose a second cavity 22. It is characterized in that: it further includes a travel switch buffer device 7. The travel switch buffer device 7 includes a connection seat 71 arranged on the outer wall of the cylinder body 2. The connection seat 71 is provided with a first fluid connection hole 711 and a second fluid connection hole 712. The first fluid connection hole 711 and the first cavity 21 are communicated through a first fluid channel 23 on the cylinder body 2. The second fluid connection hole 712 and the second cavity 22 are communicated through a second fluid channel 24 on the cylinder body 2. The second fluid connection hole 712 is connected to a throttle head 72. One end of the throttle head 72 connected to the second fluid connection hole 712 is provided with a throttle channel 721 with an inner diameter less than 1 mm.

[0034] The working principle of this embodiment is: The fluid enters the inside of the cylinder body 2 through the first fluid connection hole 711 on the connection seat 71, that is, the fluid enters the first cavity 21 from the first fluid connection hole 711 through the first fluid channel 23. The area of the first cavity 21 increases, pushing the piston 3 to move axially. The area of the second cavity 22 decreases accordingly. The fluid in the second cavity 22 flows into the throttle head 72 from the second fluid connection hole 712 through the second fluid channel 24. The fluid finally flows out through the throttle channel 721. When the piston 3 contacts the sealing ring assembly 6, the axial movement process of the piston 3 stops.

[0035] Conversely, the fluid enters the second cavity 22 from the second fluid connection hole 712 through the throttle channel 721 of the throttle head 72. The area of the second cavity 22 increases, pushing the piston 3 to move axially downward. The area of the first cavity 21 decreases accordingly. The gas in the first cavity 21 is finally discharged from the first fluid connection hole 71 through the first fluid channel 23. When the bottom surface of the piston 3 contacts the bottom surface of the cylinder body 2, the axial movement process of the piston 3 stops.

[0036] Since the second fluid passage 24 first performs the first - stage compression on the fluid flowing out of or into the second cavity 22 to stabilize the velocity of the fluid by mechanical means, and then the space between the second fluid connection hole 712 and the throttle head 72 buffers the fluid entering the throttle head 72, and the diameter of the throttle passage 721 of the throttle head 72 is less than 1 mm, the stroke of the cylinder will be significantly slowed down. Since the whole process is by mechanical means, the stroke speed of the cylinder is stable. At the same time, during the injection - molding process where the stroke slow - down is not required, the throttle head 72 can be directly removed. The connection method between the throttle head 72 and the second fluid connection hole 712 can be connection methods such as bolts, plug - in connections, and flanges. Those skilled in the art should understand that the throttle head 72 can be connected to the second fluid connection hole 712 through a pipe. The cylinder base 1 and the cylinder body 2 can be integral.

[0037] As Figures 4-5 shown, the throttle head 72 includes a fluid inlet 722 and a throttle - head body 723. The throttle - head body 723 and the fluid inlet 722 are connected by a fastening device 724. The throttle - head body 723 is connected to the second fluid connection hole 712. A throttle passage 721 is provided at one end of the throttle - head body 723 that is not connected to the fluid inlet 722. The inner diameter of the throttle passage 721 is 0.1 mm - 0.5 mm. The shapes of the fluid inlet 722 and the throttle - head body 723 can be any shape, and the connection angle between the fluid inlet 722 and the throttle - head body 723 can be any angle.

[0038] Those skilled in the art should understand that although this embodiment uses mechanical means to slow down the cylinder formation and the adapter has a relatively large rigidity, for the convenience of overhaul and replacement of the throttle passage 721, the throttle passage 721 is provided on the throttle - head body 723. Without replacing the throttle head 72, the replacement and overhaul can be carried out, further improving the stability of this embodiment. At the same time, the connection angle between the fluid inlet 722 and the throttle - head body 723 is not fixed and can be adjusted according to production needs. Among them, the throttle head 72 can be directly connected to the second fluid connection hole 712. In cases where a higher requirement for stroke slow - down is needed, it can also be connected to the second fluid connection hole 712 through a pipe or other suitable connection positions.

[0039] As Figure 3 、 Figure 7As shown, the sealing ring assembly 6 includes a cooling water jacket 61, the cooling water jacket 61 takes the piston rod 4 as the axis, the piston rod 4 is slidably connected to the cooling water jacket 61, a plurality of sealing grooves 611 of the piston rod 4 provided with sealing rings and dust rings are arranged at the inner side of the cooling water jacket 61 where the piston rod 4 is connected, a second cavity sealing groove 612 provided with a lubricating sealing ring is arranged at the outer side of the cooling water jacket 61 where the cylinder body 2 is connected, a cooling groove 613 is arranged inside the cooling water jacket 61, and the cooling water jacket 61 is fixedly connected to the cylinder body 2.

[0040] In addition to the sealing function, the cooling water jacket 61 also replaces the cylinder head. At the same time, it effectively limits the travel displacement of the piston 3. At the same time, the cooling water jacket further enhances the stability of the cylinder stroke. A cooling groove 613 is provided to cool the cylinder. When the cylinder temperature is higher than 260°C, the cylinder is cooled by adding cooling water into the cooling groove 613. The sealing groove 611 of the piston rod 4 can select the appropriate type of sealing ring and dust ring according to actual needs. The lubricating sealing ring of the second cavity sealing groove 612 can seal the second cavity 22 while lubricating the piston 3 moving stroke.

[0041] like Figure 8 As shown, the cooling groove 613 is provided with a reinforcing rib 614, and the cooling water jacket 61 is provided with cooling groove through holes 615 on both sides of the reinforcing rib 614. The cooling groove through holes 615 are arranged above the cylinder body 2, and the cooling groove through holes 615 can be provided with bolt seals when sealing is required. In addition to adding cooling water through the cooling groove through holes 615 to cool the cylinder, the cooling water jacket 61 can also be further weighted according to actual production needs when the cylinder stability requirements are high.

[0042] Furthermore, if Figure 7 and Figure 9 As shown, the cooling water jacket 61 also includes a base 62 composed of a support portion 616 and a yield portion 617. The base 62 and the cooling water jacket 61 form a second cavity sealing groove 612. The yield portion 617 is formed by yielding one end of the base 62 connected to the cylinder body 2. The yield portion 617 and the cylinder body 2 and the piston 3 enclose a second cavity 22. A plurality of intake auxiliary grooves 618 of the second cavity 22 are arranged on one side of the support portion 616 connected to the piston 3.

[0043] The relief portion 617 and the intake auxiliary groove 618 are provided to make it easier for the gas to fill the chamber, and also increase the area of the second cavity 22, further slowing down the stroke of the cylinder. At the same time, the support portion 616 positions and stabilizes the piston 3 and the piston rod 4. The relief portion 617 and the intake auxiliary groove 618 can also buffer when the piston 3 and the piston rod 4 reach the end of the stroke, reducing the possible damage to the cylinder caused by partial direct impact. The intake auxiliary groove 618 can more fully fill the second cavity 22 with gas during intake.

[0044] As Figure 10 shown, a process hole 31 is provided at the center position of the bottom surface of the piston 3, and a piston lubrication groove 33 with a sealing ring is provided on the side surface of the piston 3. The process hole 31 can be used to pull out the piston when the piston together with the valve needle cannot be pulled out. In addition, a gasket can be added to the process hole 31 to change the movement stroke of the piston.

[0045] Preferably, a convex portion 32 is provided on the bottom surface of the piston 3, and a chamfer is provided at the position where the convex portion 32 is connected to the process hole 31. By providing the convex portion 32, while adjusting the stroke of the cylinder, it can further buffer the stroke of the cylinder and reduce the wear of the piston and the cylinder. At the same time, the chamfer is provided to facilitate the addition and removal of the gasket.

[0046] As Figure 10 shown, an output shaft mounting seat 41 is provided on the piston rod 4. The output shaft 5 includes an output shaft base 51. The output shaft mounting seat 41 is provided with a limiting structure 411 for the output shaft base 51, and the output shaft mounting seat 41 is also provided with an output shaft protection ring 412. The limiting structure 411 limits the output shaft 5 to prevent the output shaft 5 from rotating and causing unstable cylinder stroke, and a flat wire structure can be used. The output shaft protection ring 412 further stabilizes the stroke of the cylinder on the basis of the output shaft base 51 and protects the output shaft. The output shaft protection ring 412 can be adjusted according to the structure of the cylinder connecting slider.

[0047] The throttle head 72 is connected to the one-way throttle valve. An installation table 9 fixedly connected to the cooling water jacket 61 is provided on the cooling water jacket 61. The output shaft protection ring 412 and the installation table 9 form an anti-rotation structure. Since a series of measures have been taken in this embodiment to stabilize the stroke of the cylinder, a one-way throttle valve can be connected to further adjust the speed range of the cylinder to better meet the actual production needs. For the stability of the mold opening process, the slider installation table 9 can be set to be more stable, and the anti-rotation structure formed by the output shaft protection ring 412 and the installation table 9 also further improves the stability of the cylinder.

[0048] Embodiment 2

[0049] This embodiment is basically the same as Embodiment 1, except that

[0050] As Figure 6 shown, the throttle head body 723 includes a first throttle chamber 723a and a second throttle chamber 723b. The first throttle chamber 723a and the second throttle chamber 723b are connected by a throttle adjustment device 723c. A throttle passage 721 is provided in the first throttle chamber 723a. The inner diameter of the first throttle chamber 723a is smaller than the inner diameter of the second throttle chamber 723b.

[0051] The first throttle chamber 723a is composed of a large chamber that is connected to the second throttle chamber 723b and has an inner diameter smaller than that of the second throttle chamber 723b, and a small chamber whose inner diameter is not greater than half of the inner diameter of the large chamber. After the fluid at the fluid inlet 722 enters the second throttle chamber 723b, due to the smaller inner diameter of the second throttle chamber 723b, the fluid is throttled and buffered for the first time. The fluid enters the first throttle chamber 723a through the throttle adjustment device 723c. While the throttle adjustment device 723c further buffers the fluid, the throttle passage 721 of the throttle adjustment device 723c is located at the connection between the large chamber and the small chamber during air intake. The fluid enters the first throttle chamber 723a from the throttle passage 721 and then enters the second fluid connection hole 712 from the first throttle chamber 723a, further buffering the fluid.

[0052] Conversely, the fluid enters the first throttle chamber 723a, enters the throttle adjustment device 723c through the throttle passage 721, and then enters the second throttle chamber 723b. The fluid pushes the throttle adjustment device 723c to move backward, so that the fluid in the throttle head body 723 also passes through two buffers and then through the throttle passage 721. This ensures the effect of slowing down the cylinder stroke.

[0053] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0054] Although the terms such as cylinder block base 1, cylinder block 2, piston 3, piston rod 4, first cavity 21, output shaft 5, seal ring assembly 6, second cavity 22, travel switch buffer device 7, connecting seat 71, first fluid connection hole 711, second fluid connection hole 712, first fluid passage 23, second fluid passage 24, throttle head 72, throttle passage 721, fluid port 722, throttle head body 723, fastening device 724, first throttle cavity 723a, second throttle cavity 723b, throttle adjustment device 723c, cooling water jacket 61, seal groove 611, second cavity seal groove 612, cooling groove 613, reinforcing rib 614, cooling groove through hole 615, support portion 616, relief portion 617, base 62, intake auxiliary groove 618, gasket groove 31, gasket 32, piston lubrication groove 33, cylinder block protective shell 8, mounting seat 81, connecting seat mounting groove 82, output shaft mounting seat 41, output shaft base 51, limiting structure 41, output shaft protection ring 412, mounting table 9 are used more frequently in this text, it does not exclude the possibility of using other terms. The use of these terms is only for more convenient description and explanation of the essence of the present invention, and interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. An injection molding cylinder with a function of slowing down the stroke, comprising a cylinder body (2) provided with a cylinder body base (1), a piston (3) that can slide up and down is arranged inside the cylinder body (2), the piston (3) is connected to a piston rod (4), the bottom surface of the piston (3) far from the piston rod (4) and the cylinder body (2) enclose a first cavity (21), a detachable output shaft (5) is arranged on the piston rod (4), a sealing ring assembly (6) is arranged at the upper end of the cylinder body (2), and the sealing ring assembly (6), the cylinder body (2), the piston (3) and the piston rod (4) enclose a second cavity (22), and it is characterized in that: It further includes a travel switch buffer device (7). The travel switch buffer device (7) includes a connection seat (71) arranged on the outer wall of the cylinder block (2). The connection seat (71) is provided with a first fluid connection hole (711) and a second fluid connection hole (712). The first fluid connection hole (711) and the first cavity (21) are communicated through a first fluid channel (23) on the cylinder block (2). The second fluid connection hole (712) and the second cavity (22) are communicated through a second fluid channel (24) on the cylinder block (2). The second fluid connection hole (712) is connected to a throttle head (72). One end of the throttle head (72) connected to the second fluid connection hole (712) is provided with a throttle channel (721) with an inner diameter less than 1 mm. The throttle head (72) includes a fluid port (722) and a throttle head body (723). The throttle head body (723) and the fluid port (722) are connected through a fastening device (724). The throttle head body (723) is connected to the second fluid connection hole (712). One end of the throttle head body (723) not connected to the fluid port (722) is provided with a throttle channel (721). The inner diameter of the throttle channel (721) is 0.1 mm - 0.5 mm. The throttle head body (723) includes a first throttle cavity (723a) and a second throttle cavity (723b). The first throttle cavity (723a) and the second throttle cavity (723b) are connected through a throttle adjustment device (723c). The first throttle cavity (723a) is provided with a throttle channel (721). The inner diameter of the first throttle cavity (723a) is less than the inner diameter of the second throttle cavity (723b). The sealing ring assembly (6) includes a cooling water jacket (61). The cooling water jacket (61) takes the piston rod (4) as the axis. The piston rod (4) is slidably connected to the cooling water jacket (61). At the part where the inner side of the cooling water jacket (61) is in contact with the piston rod (4), a plurality of seal grooves (611) of the piston rod (4) provided with sealing rings and dust-proof rings are arranged. At the part where the outer side of the cooling water jacket (61) is in contact with the cylinder block (2), a second cavity sealing groove (612) provided with a lubricating sealing ring is arranged. A cooling groove (613) is arranged inside the cooling water jacket (61). The cooling water jacket (61) is fixedly connected to the cylinder block (2).

2. The air cylinder for injection molding with a stroke slowdown function according to claim 1, characterized in that: Reinforcing ribs (614) are arranged in the cooling groove (613). Cooling groove through holes (615) are arranged on both sides of the reinforcing ribs (614) of the cooling water jacket (61). The cooling groove through holes (615) are arranged above the cylinder block (2). The cooling groove through holes (615) are provided with bolt seals.

3. The air cylinder for injection molding with a stroke slowdown function according to claim 1, characterized in that: The described cooling water jacket (61) further includes a base (62) composed of a support portion (616) and a relief portion (617). The base (62) and the cooling water jacket (61) form a second cavity sealing groove (612). The relief portion (617) is formed by relieving at one end of the base (62) connected to the cylinder block (2). The relief portion (617), the cylinder block (2), and the piston (3) enclose a second cavity (22). A number of air intake auxiliary grooves (618) of the second cavity (22) are provided on the surface of the support portion (616) in contact with the piston (3).

4. The air cylinder for injection molding with a function of slowing down the stroke according to claim 1, characterized in that: A process hole (31) is provided at the axial center position of the bottom surface of the described piston (3). A piston lubrication groove (33) with a sealing ring is provided on the side surface of the piston (3).

5. The injection molding cylinder with a stroke slowdown function according to claim 4, characterized in that: A convex portion (32) is provided on the bottom surface of the described piston (3), and a chamfer is provided at the position where the convex portion (32) is in contact with the process hole (31).

6. The air cylinder for injection molding with a stroke slowdown function according to claim 1, characterized in that: An output shaft mounting seat (41) is provided on the described piston rod (4). The output shaft (5) includes an output shaft base (51). The output shaft mounting seat (41) is provided with a limiting structure (411) for the output shaft base (51), and the output shaft mounting seat (41) is further provided with an output shaft protection ring (412); the throttle head (72) is connected to a one-way throttle valve. An installation table (9) fixedly connected to the cooling water jacket (61) is provided on the cooling water jacket (61). The output shaft protection ring (412) and the installation table (9) form an anti-rotation structure.

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