A clamping cylinder of an injection molding machine

Abstract

The present invention relates to the technical field of injection molding machine clamping technology, and specifically discloses a clamping oil cylinder of an injection molding machine, which includes: a cylinder body, a clamping piston and a pull rod. A circular cavity is arranged inside the cylinder body, and the clamping piston is arranged inside the cavity and can slide inside the cavity with the injection of hydraulic oil; the pull rod includes a connecting column, the connecting column penetrates through the inside of the clamping piston and is fixed to the clamping piston through a second flange; an inner sealing ring is arranged between the clamping piston and the connecting column, and an outer sealing ring is arranged between the clamping piston and the cylinder body. Vertical grooves and horizontal grooves are also formed inside the clamping piston; for the clamping oil cylinder of the injection molding machine of the present invention, the clamping piston and the pull rod are fixed through the second flange, so that the pull rod is pushed by the clamping piston during the clamping process. Compared with the direct threaded connection method, it can effectively reduce the pressure on the pull rod during the clamping process and avoid the problem of reduced sealing performance caused by thread breakage between the clamping piston and the pull rod.

Description

Technical Field

[0001] The invention relates to the technical field of mold locking of injection molding machines, and in particular to a mold locking oil cylinder of an injection molding machine. Background Art

[0002] The clamping cylinder is a key component in die-casting machines, injection molding machines and other equipment, and mainly works based on the principle of hydraulic transmission. The hydraulic system delivers pressurized oil to different chambers of the clamping cylinder, and uses the pressure of the oil to push the piston and piston rod to move, thereby realizing the opening and closing of the mold.

[0003] In the use of existing clamping cylinders, for the convenience of disassembly and assembly, the clamping piston and the pull rod are mostly connected by threads. Since the clamping process is subjected to huge oil pressure, the clamping piston drags the pull rod for a long time, which is prone to thread breakage and leads to reduced sealing. In addition, the sealing rings in the clamping cylinders are mostly sealed by their own elastic deformation. As the use time increases, the elasticity of the sealing rings decreases. During the use of the clamping cylinders, the sealing rings are easily worn and deformed, resulting in reduced sealing performance in the clamping cylinders and internal leakage. The effective pressure in the clamping is reduced, resulting in a shorter service life of the equipment. Summary of the invention

[0004] The present invention provides a clamping cylinder for an injection molding machine, aiming to solve the problem in the related art that thread breakage easily occurs, resulting in reduced sealing performance, and the sealing ring is extremely easy to wear and deform, resulting in reduced sealing performance in the clamping cylinder and internal leakage.

[0005] The mold locking oil cylinder of the injection molding machine of the present invention comprises a cylinder body, a mold locking piston and a pull rod, a circular cavity is arranged inside the cylinder body, and the mold locking piston is arranged inside the cavity and can slide in the cavity as oil is injected;

[0006] The pull rod includes a connecting column, which passes through the interior of the mold locking piston and is fixed to the mold locking piston through a second flange;

[0007] An inner sealing ring is arranged between the locking piston and the connecting column, an outer sealing ring is arranged between the locking piston and the cylinder body, and a vertical groove and a transverse groove are also opened inside the locking piston. The vertical groove is located between the inner sealing ring and the outer sealing ring to connect the space where the inner sealing ring and the outer sealing ring are located. The end of the transverse groove is connected to the vertical groove, and a sealing plug is arranged inside the transverse groove so as to be able to slide inside the transverse groove.

[0008] Preferably, the two ends of the locking piston divide the cavity in the cylinder body into a locking cavity and an opening cavity, and a locking oil hole and an opening oil hole are provided on the side wall of the cylinder body, and the locking oil hole is connected to the locking cavity, and the opening oil hole is connected to the opening cavity.

[0009] Preferably, a circular end groove, a middle groove, and a tail groove are successively formed inside the mode-locking piston. The end groove, the middle groove, and the tail groove are coaxially connected and their diameters increase successively.

[0010] Preferably, the connecting column is composed of a column body, a column head, and wing plates. The column body is located inside the end groove, the column head is located inside the middle groove and is fixed to the column body, and one end of the column head away from the column body extends into the tail groove. The wing plates are fixedly installed in a ring shape outside the column head, and the wing plates are located inside the middle groove and are adapted to the size of the middle groove.

[0011] Preferably, the second flange is arranged inside the tail groove and is located on one side of the wing plates. Second threaded holes corresponding to the flange holes of the second flange are formed at the end of the mode-locking piston. Second bolts are arranged in the flange holes of the second flange, and the tail ends of the second bolts are threadedly connected in the second threaded holes.

[0012] Preferably, the second threaded holes are communicated with the transverse grooves, and a connecting rod is arranged between the sealing plugs and the second bolts.

[0013] Preferably, the pull rod further includes a guide post and a tail post. The guide post extends into the cylinder body and is fixed to the column body, and the tail post is fixedly installed at one end of the guide post away from the cylinder body, and a threaded portion is arranged on the tail post.

[0014] Preferably, annular inner sealing grooves and outer sealing grooves are respectively formed on the mode-locking piston. Both ends of the vertical groove are communicated with the inner sealing groove and the outer sealing groove respectively. Inner sealing rings are arranged in the inner sealing grooves, and outer sealing rings are arranged in the outer sealing grooves.

[0015] Preferably, a cylinder head is arranged at the end of the cylinder body. A first flange is sleeved outside the cylinder head. First bolts are arranged in the flange holes of the first flange. First threaded holes corresponding to the flange holes of the first flange are formed on the end face of the cylinder body, and the tail ends of the first bolts are threadedly connected in the first threaded holes.

[0016] Preferably, mounting grooves are formed on the inner wall of the cylinder body. Locking blocks are slidably assembled inside the mounting grooves. Elastic members are arranged between the locking blocks and the mounting grooves. Locking grooves adapted to the locking blocks are formed on the outer wall of the mode-locking piston, and when the locking grooves move to one side of the mounting grooves, the locking blocks can be inserted into the locking grooves.

[0017] Beneficial effects:

[0018] 1. When the present invention is in use, the second flange is used to fix between the die-locking piston and the pull rod, so that during the die-locking process, the pull rod is pushed by the die-locking piston to move. Compared with the direct threaded connection method, it can effectively reduce the pressure on the pull rod during the die-locking process, avoid the problem of reduced sealing performance caused by thread breakage between the die-locking piston and the pull rod, and at the same time of fixing between the die-locking piston and the pull rod, the sealing plug can apply pressure to the inner sealing ring and the outer sealing ring, causing the inner sealing ring and the outer sealing ring to be compressed and deformed, fully filling the space of their respective sealing grooves, and then closely adhering to the surface of the pull rod and the inner wall of the cylinder body, effectively reducing the deformable space of the inner sealing ring and the outer sealing ring, making it not easy for the inner sealing ring and the outer sealing ring to be further compressed during the use of the oil cylinder, and then not easy to break away from the pull rod and the cylinder body due to wear and deformation, effectively reducing their wear rate, reducing the risk of internal leakage, and increasing the service life of the equipment.

[0019] 2. When the present invention is in use, the locking block can automatically lock the die-locking piston when the die-locking is completed, so that the die-locking piston cannot move when not under the breaking die pressure, and then it can avoid the situation that the template automatically opens due to the accidental disappearance of the die-locking pressure during injection molding, improving the die-locking effect of the die-locking oil cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a perspective view of the present invention.

[0021] Figure 2 is a front view of the present invention.

[0022] Figure 3 is a cross-sectional view of the cylinder body of the present invention.

[0023] Figure 4 is the present invention Figure 3 an enlarged structural schematic diagram of part A in.

[0024] Figure 5 is a front view of the pull rod of the present invention.

[0025] Figure 6 is a perspective view of the cylinder body of the present invention.

[0026] Figure 7 is a perspective view of the die-locking piston of the present invention.

[0027] Figure 8 is the present invention Figure 7 front cross-sectional view.

[0028] Reference numerals:

[0029] 10. Cylinder block; 11. Cylinder head; 111. First flange; 112. First bolt; 12. Clamping cavity; 13. Mold opening cavity; 14. Clamping oil hole; 15. Mold opening oil hole; 16. First threaded hole; 17. Installation groove; 20. Clamping piston; 21. End groove; 22. Middle groove; 23. Tail groove; 25. Inner sealing groove; 26. Outer sealing groove; 27. Inclined part; 28. Second threaded hole; 29. Locking groove; 30. Tie rod; 31. Connecting column; 311. Column body; 312. Column head; 313. Wing plate; 32. Guide post; 33. Tail post; 331. Threaded part; 40. Seal; 41. Inner seal ring; 42. Outer seal ring; 50. Boosting mechanism; 51. Vertical groove; 52. Horizontal groove; 53. Sealing plug; 531. Connecting rod; 60. Locking mechanism; 61. Locking block; 62. Elastic part; 70. Second flange; 71. Second bolt. Detailed implementation mode

[0030] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0031] As Figures 1 to 8 shown, the clamping oil cylinder of the injection molding machine of the present invention includes a cylinder block 10, a clamping piston 20, a tie rod 30, a seal 40, a boosting mechanism 50 and a locking mechanism 60. A circular cavity is provided inside the cylinder block 10. The clamping piston 20 is slidably arranged in the cavity along the axial direction of the cylinder block 10. The end of the tie rod 30 penetrates into the cavity and is fixed to the clamping piston 20, and can drive the tie rod 30 to move during the movement of the clamping piston 20 to perform clamping and mold breaking between the moving template and the fixed template. The seal 40 is arranged between the clamping piston 20 and the tie rod 30, and between the clamping piston 20 and the inner wall of the cylinder block 10, and can respectively seal between the clamping piston 20 and the tie rod 30, and between the clamping piston 20 and the inner wall of the cylinder block 10 in cooperation with the boosting mechanism 50.

[0032] Refer to Figures 1 - 3 , a cylinder head 11 is provided at the end of the cylinder block 10 for sealing the cavity. The two ends of the clamping piston 20 divide the cavity into a clamping cavity 12 and a mold opening cavity 13. A clamping oil hole 14 and a mold opening oil hole 15 are opened on the side wall of the cylinder block 10, and the clamping oil hole 14 is communicated with the clamping cavity 12, and the mold opening oil hole 15 is communicated with the mold opening cavity 13. Oil can be injected into the clamping cavity 12 through the clamping oil hole 14. Under the action of the oil pressure, the clamping piston 20 drives the tie rod 30 to move towards the mold opening cavity 13 to realize the clamping of the moving template and the fixed template. Oil can be injected into the mold opening cavity 13 through the mold opening oil hole 15. Under the action of the oil pressure, the clamping piston 20 drives the tie rod 30 to move towards the clamping cavity 12 to realize the mold breaking of the moving template and the fixed template.

[0033] Reference Figure 1 With Figure 6 , a first flange 111 is sleeved outside the cylinder head 11. A first bolt 112 is arranged in the flange hole on the first flange 111. A first threaded hole 16 corresponding to the flange hole of the first flange 111 is opened on the end face of the cylinder block 10. The tail end of the first bolt 112 is threadedly connected in the first threaded hole 16. The first flange 111 is fixed by screwing the first bolt 112 into the first threaded hole 16, and then the cylinder head 11 is fixed to the cylinder block 10 to seal the cavity.

[0034] Reference Figure 8 , a circular end groove 21, a middle groove 22 and a tail groove 23 are successively opened inside the die-locking piston 20. The end groove 21, the middle groove 22 and the tail groove 23 are coaxially communicated and the diameters increase successively, which is used for installing the tie rod 30.

[0035] Reference Figure 8 , an annular inner sealing groove 25 and an outer sealing groove 26 are opened on the die-locking piston 20. The inner sealing groove 25 is located inside the end groove 21, and the outer sealing groove 26 is located on the outer wall of the die-locking piston 20, which is used for installing the seal 40. An inclined part 27 is arranged on the end face of the die-locking piston 20 close to the die-locking oil hole 14, which can increase the contact area between the die-locking piston 20 and the oil fluid, increase the force-bearing area of the die-locking piston 20 during the die-locking process, so as to facilitate the die-locking piston 20 to be better stressed, and then improve the service life of the die-locking piston 20.

[0036] Reference Figure 5 , the tie rod 30 is composed of a connecting column 31, a guide column 32 and a tail column 33, and the diameters of the connecting column 31, the guide column 32 and the tail column 33 increase successively. The connecting column 31 is located in the cavity and is connected to the die-locking piston 20. The guide column 32 passes through and is slidably arranged in the cylinder block 10 and is fixed to the connecting column 31. The tail column 33 is fixedly connected to one end of the guide column 32 far from the tail column 33, and a threaded part 331 is arranged on the tail column 33, so as to facilitate the installation between the tail column 33 and the moving template. The guide column 32 has a guiding part and an installation part, and the diameter of the guiding part is smaller than that of the installation part, so that when the tie rod 30 is installed with the template, it can be guided by the guiding part for more convenient installation.

[0037] Reference Figure 3 With Figure 8 , the connecting column 31 is composed of a column body 311, a column head 312 and a wing plate 313. The column body 311 is located inside the end groove 21. The column head 312 is located inside the middle groove 22 and is fixed to the column body 311, and one end of the column head 312 far from the column body 311 extends into the tail groove 23. The wing plate 313 is fixedly installed in a ring outside the column head 312, and the wing plate 313 is located inside the middle groove 22 and is adapted to the size of the middle groove 22.

[0038] Reference Figure 3 、 Figure 6 、 Figure 7 and Figure 8 , a second flange 70 is arranged inside the tail groove 23, and the second flange 70 is located on one side of the wing plate 313, capable of blocking and limiting the wing plate 313, so that the wing plate 313 cannot break away from the middle groove 22. A second bolt 71 is arranged in the flange hole of the second flange 70, and a second threaded hole 28 corresponding to the flange hole of the second flange 70 is opened on the end face of the clamping die piston 20. The tail end of the second bolt 71 is threadedly connected in the second threaded hole 28.

[0039] Reference Figure 3 and Figure 8 , the seal 40 includes an inner seal ring 41 and an outer seal ring 42. The inner seal ring 41 is arranged inside the inner seal groove 25, and the inner wall of the inner seal ring 41 is closely attached to the column body 311, for sealing between the column body 311 and the clamping die piston 20. The outer seal ring 42 is arranged inside the outer seal groove 26, and the outer wall of the outer seal ring 42 is closely attached to the inner wall of the cylinder block 10, for sealing between the cylinder block 10 and the clamping die piston 20.

[0040] Reference Figure 3 and Figure 8 , the pressurizing mechanism 50 includes a vertical groove 51, a transverse groove 52 and a sealing plug 53. The vertical groove 51 and the transverse groove 52 are communicated with each other and are arranged in a T shape inside the clamping die piston 20, and both ends of the vertical groove 51 are communicated with the inner seal groove 25 and the outer seal groove 26 respectively. One end of the transverse groove 52 far away from the vertical groove 51 is communicated with the second threaded hole 28. The sealing plug 53 is arranged inside the transverse groove 52. When the sealing plug 53 slides along the transverse groove 52 and approaches the vertical groove 51, the air inside the vertical groove 51 and the transverse groove 52 can be compressed, increasing the internal pressure thereof, pressing the inner seal ring 41 and the outer seal ring 42 to move out of the seal groove, and then enabling them to closely adhere to the outer wall of the column body 311 and the inner wall of the cylinder block 10, enhancing the sealing effect inside the cylinder block 10 and prolonging the service life of the equipment. The sealing plug 53 and the second bolt 71 are connected by a connecting rod 531, so that when the second bolt 71 is screwed into the second threaded hole 28, the sealing plug 53 can be pushed to slide inside the transverse groove 52, and then pressure is applied to the inner seal ring 41 and the outer seal ring 42.

[0041] Reference Figure 4, the locking mechanism 60 includes a locking block 61 and an elastic member 62. An installation groove 17 is formed on the inner wall of the cylinder block 10. The locking block 61 is slidably assembled inside the installation groove 17. The elastic member 62 is arranged between the locking block 61 and the installation groove 17 for elastically supporting the locking block 61, enabling the locking block 61 to slide within the installation groove 17. In this solution, the elastic member 62 is specifically a spring. A locking groove 29 adapted to the locking block 61 is formed on the outer wall of the mold clamping piston 20. When the mold clamping piston 20 completes the mold clamping of the template, the locking groove 29 is aligned with the installation groove 17, and the locking block 61 can be inserted into the locking groove 29 under the push of the elastic member 62, thereby locking the mold clamping piston 20. When the mold clamping pressure inside the cylinder block 10 suddenly disappears, the mold clamping piston 20 can be restricted by the locking block 61 and will not retreat, thus effectively preventing the template from accidentally opening during injection molding. The bottom end of the locking block 61 is conical, so that when the mold clamping piston 20 is reset and the mold is broken, under the action of the mold breaking pressure, the locking block 61 can be pushed to retract into the installation groove 17, releasing the locking of the mold clamping piston 20.

[0042] Working principle: During the assembly of the mold clamping oil cylinder, the second bolt 71 is passed through the flange hole of the second flange 70, so that the connecting rod 531 and the sealing plug 53 pass through the second threaded hole 28 and are inserted into the transverse groove 52. Then, the second bolt 71 is screwed into the second threaded hole 28, so that the second flange 70 presses the wing plate 313, fixing the connecting column 31 to the mold clamping piston 20, completing the fixation between the tie rod 30 and the mold clamping piston 20. When the mold clamping piston 20 moves inside the cylinder block 10, it can drive the tie rod 30 to move;

[0043] As the second bolt 71 penetrates deeper into the second threaded hole 28, the connecting rod 531 pushes the sealing plug 53 to move within the transverse groove 52, compressing the air inside the vertical groove 51 and the transverse groove 52, increasing the internal pressure, pressing the inner sealing ring 41 and the outer sealing ring 42, so that the inner sealing ring 41 is compressed towards the column body 311 and then tightly adheres to the surface of the column body 311, and the outer sealing ring 42 is compressed towards the inner wall of the cylinder block 10 and then tightly adheres to the inner wall of the cylinder block 10, realizing the sealing between the mold clamping piston 20 and the tie rod 30, and between the mold clamping piston 20 and the cylinder block 10;

[0044] The cylinder head 11 is closed to the end of the cylinder block 10. The first bolt 112 is passed through the flange hole on the first flange 111 and then screwed into the first threaded hole 16 to fix the cylinder head 11 to the cylinder block 10, closing the cavity of the cylinder block 10. When oil is injected into the mold clamping cavity 12 through the mold clamping oil hole 14, it can push the mold clamping piston 20 to move towards the mold opening cavity 13, so that the tie rod 30 drives the template to move for mold clamping. When oil is injected into the mold opening cavity 13 through the mold opening oil hole 15, it can push the mold clamping piston 20 to move towards the mold clamping cavity 12, so that the tie rod 30 drives the template to move for mold breaking;

[0045] When the mold clamping piston 20 finishes moving for mold clamping, the locking groove 29 stays on one side of the installation groove 17 and communicates with it, enabling the locking block 61 to be automatically inserted into the locking groove 29 under the push of the elastic member 62 to lock the mold clamping piston 20. When the mold clamping piston 20 moves to break the mold, the mold clamping piston 20 can push the locking block 61 to rise into the installation groove 17 under the thrust of the oil pressure, automatically releasing the lock on the mold clamping piston 20.

[0046] In the present invention, the second flange 70 is used to fix between the mold clamping piston 20 and the tie rod 30, so that the tie rod 30 is pushed by the mold clamping piston 20 during the mold clamping process. Compared with the direct threaded connection method, the flange connection method makes the force on the tie rod 30 more uniform, can effectively reduce the pressure on the tie rod 30 during the mold clamping process, and avoids the problem of reduced sealing performance caused by thread breakage between the mold clamping piston 20 and the tie rod 30. At the same time of fixing between the mold clamping piston 20 and the tie rod 30, the sealing plug 53 can apply pressure to the inner sealing ring 41 and the outer sealing ring 42, causing the inner sealing ring 41 and the outer sealing ring 42 to be compressed and deformed, fully filling the space of their respective sealing grooves, and then closely adhering to the surface of the tie rod 30 and the inner wall of the cylinder block 10, effectively reducing the deformable space of the inner sealing ring 41 and the outer sealing ring 42, making it difficult for the inner sealing ring 41 and the outer sealing ring 42 to be further compressed during the use of the oil cylinder, and then not easily detaching from the tie rod 30 and the cylinder block 10 due to wear and deformation, effectively reducing their wear rate, reducing the risk of internal leakage, and increasing the service life of the equipment; when the mold clamping is completed, the mold clamping piston 20 can be automatically locked by the locking block 61, so that the mold clamping piston 20 cannot move without the mold breaking pressure, and then the situation of the template automatically opening due to the accidental disappearance of the mold clamping pressure during injection molding can be avoided, improving the mold clamping effect of the mold clamping oil cylinder.

[0047] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A clamping cylinder for an injection molding machine, comprising a cylinder body (10), a clamping piston (20) and a tie rod (30), characterized in that: A circular cavity is arranged inside the cylinder body (10), and a mold locking piston (20) is arranged inside the cavity and can slide inside the cavity as oil is injected; The interior of the mold locking piston (20) is provided with circular end grooves (21), middle grooves (22) and tail grooves (23) in sequence, and the end grooves (21), middle grooves (22) and tail grooves (23) are coaxially connected and their diameters increase in sequence; The pull rod (30) includes a connecting column (31), which passes through the interior of the locking piston (20) and is fixed to the locking piston (20) via a second flange (70); the second flange (70) is arranged inside the tail groove (23) and is located on one side of the wing plate (313); a second threaded hole (28) corresponding to the flange hole of the second flange (70) is opened at the end of the locking piston (20); a second bolt (71) is arranged in the flange hole of the second flange (70); the tail end of the second bolt (71) is threadedly connected in the second threaded hole (28); the second threaded hole (28) is communicated with the transverse groove (52); and a connecting rod (531) is arranged between the sealing plug (53) and the second bolt (71); An inner sealing ring (41) is arranged between the mold locking piston (20) and the connecting column (31), an outer sealing ring (42) is arranged between the mold locking piston (20) and the cylinder body (10), and a vertical groove (51) and a transverse groove (52) are also provided inside the mold locking piston (20). The vertical groove (51) is located between the inner sealing ring (41) and the outer sealing ring (42) to connect the space where the inner sealing ring (41) and the outer sealing ring (42) are located. The end of the transverse groove (52) is connected to the vertical groove (51), and a sealing plug (53) is arranged inside the transverse groove (52) to be able to slide inside the transverse groove (52).

2. The clamping cylinder of the injection molding machine according to claim 1, characterized in that: The two ends of the mold locking piston (20) divide the cavity in the cylinder body (10) into a mold locking cavity (12) and a mold opening cavity (13); a mold locking oil hole (14) and a mold opening oil hole (15) are provided on the side wall of the cylinder body (10); the mold locking oil hole (14) is connected to the mold locking cavity (12), and the mold opening oil hole (15) is connected to the mold opening cavity (13).

3. The clamping cylinder of the injection molding machine according to claim 2, characterized in that: The connecting column (31) is composed of a column body (311), a column head (312), and a wing plate (313); the column body (311) is located inside the end groove (21); the column head (312) is located inside the middle groove (22) and is fixed to the column body (311); and one end of the column head (312) away from the column body (311) extends into the tail groove (23); the wing plate (313) is fixedly installed on the outside of the column head (312) in an annular shape; and the wing plate (313) is located inside the middle groove (22) and is adapted to the size of the middle groove (22).

4. The clamping cylinder of the injection molding machine according to claim 1, characterized in that: The pull rod (30) further comprises a guide column (32) and a tail column (33); the guide column (32) extends into the cylinder body (10) and is fixed to the column body (311); the tail column (33) is fixedly mounted on an end of the guide column (32) away from the cylinder body (10), and a threaded portion (331) is provided on the tail column (33).

5. The clamping cylinder of the injection molding machine according to claim 1, characterized in that: The locking piston (20) is provided with an annular inner sealing groove (25) and an outer sealing groove (26), and both ends of the vertical groove (51) are respectively connected to the inner sealing groove (25) and the outer sealing groove (26). The inner sealing ring (41) is arranged in the inner sealing groove (25), and the outer sealing ring (42) is arranged in the outer sealing groove (26).

6. The clamping cylinder of the injection molding machine according to claim 1, characterized in that: A cylinder head (11) is provided at the end of the cylinder body (10), a first flange (111) is sleeved on the outside of the cylinder head (11), a first bolt (112) is provided in a flange hole on the first flange (111), a first threaded hole (16) corresponding to the flange hole of the first flange (111) is provided on the end surface of the cylinder body (10), and the tail end of the first bolt (112) is threadedly connected in the first threaded hole (16).

7. The clamping cylinder of the injection molding machine according to claim 1, characterized in that: The inner wall of the cylinder body (10) is provided with a mounting groove (17), a locking block (61) is slidably mounted inside the mounting groove (17), an elastic member (62) is arranged between the locking block (61) and the mounting groove (17), and the outer wall of the locking piston (20) is provided with a locking groove (29) adapted to the locking block (61), so that when the locking groove (29) moves to one side of the mounting groove (17), the locking block (61) can be inserted into the locking groove (29).

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