Mould locking oil cylinder of injection molding machine

Abstract

The invention relates to the technical field of injection molding machine mold locking, and particularly discloses a mold locking oil cylinder of an injection molding machine, the mold locking oil cylinder comprises a cylinder body, a mold locking piston and a pull rod, the cylinder body is internally provided with a circular cavity, and the mold locking piston is arranged in the cavity and can slide in the cavity along with injection of oil; the pull rod comprises a connecting column, and the connecting column penetrates through the interior of the mold locking piston and is fixed to the mold locking piston through a second flange. An inner sealing ring is arranged between the mold locking piston and the connecting column, an outer sealing ring is arranged between the mold locking piston and the cylinder body, and a vertical groove and a transverse groove are further formed in the mold locking piston; according to the mold locking oil cylinder of the injection molding machine, the mold locking piston and the pull rod are fixed through the second flange, so that the mold locking piston pushes the pull rod to move in the mold locking process, and compared with a direct threaded connection mode, the pressure borne by the pull rod in the mold locking process can be effectively reduced; and the problem that the sealing performance is reduced due to thread fracture between the mold locking piston and the pull rod is avoided.

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, the interior of the locking piston is provided with circular end grooves, middle grooves and tail grooves in sequence, and the end grooves, middle grooves and tail grooves are coaxially connected and their diameters increase in sequence.

[0010] Preferably, the connecting column consists of a column body, a column capital and a wing plate, the column body is located inside the end groove, the column capital is located inside the middle groove and fixed to the column body, and the column capital extends away from one end of the column body to the tail groove, the wing plate is fixedly installed on the outside of the column capital in a ring shape, and the wing plate is located inside the middle groove and adapted to the size of the middle groove.

[0011] Preferably, the second flange is arranged inside the tail groove and located on one side of the wing plate, and the end of the locking piston is provided with a second threaded hole corresponding to the flange hole of the second flange, and a second bolt is arranged in the flange hole of the second flange, and the tail end of the second bolt is threadedly connected in the second threaded hole.

[0012] Preferably, the second threaded hole is communicated with the transverse groove, and a connecting rod is provided between the sealing plug and the second bolt.

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

[0014] Preferably, the locking piston is provided with an annular inner sealing groove and an outer sealing groove, both ends of the vertical groove are respectively connected with the inner sealing groove and the outer sealing groove, the inner sealing ring is arranged in the inner sealing groove, and the outer sealing ring is arranged in the outer sealing groove.

[0015] Preferably, a cylinder cover is provided at the end of the cylinder body, a first flange is sleeved on the outside of the cylinder cover, a first bolt is provided in the flange hole on the first flange, a first threaded hole corresponding to the flange hole of the first flange is opened on the end surface of the cylinder body, and the tail end of the first bolt is threadedly connected in the first threaded hole.

[0016] Preferably, a mounting groove is provided on the inner wall of the cylinder body, a locking block is slidably mounted inside the mounting groove, an elastic member is arranged between the locking block and the mounting groove, and a locking groove matched with the locking block is provided on the outer wall of the locking piston, so that the locking block can be inserted into the locking groove when the locking groove moves to one side of the mounting groove.

[0017] Beneficial effects:

[0018] 1. When the present invention is in use, the second flange is used to fix the locking piston and the tie rod, so that the locking piston pushes the tie rod to move during the locking process. Compared with the direct threaded connection method, the pressure on the tie rod during the locking process can be effectively reduced, and the problem of thread breakage between the locking piston and the tie rod resulting in reduced sealing can be avoided. While fixing the locking piston and the tie rod, the sealing plug can apply pressure to the inner sealing ring and the outer sealing ring, so that the inner sealing ring and the outer sealing ring are compressed and deformed, fully filling the space of their respective sealing grooves, and then tightly attached to the surface of the tie rod and the inner wall of the cylinder body, effectively reducing the deformable space of the inner sealing ring and the outer sealing ring, so that the inner sealing ring and the outer sealing ring are not easy to be further compressed during the use of the oil cylinder, and then not easy to separate from the tie 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 locking piston when the mold locking is completed, so that the locking piston cannot move when it is not subjected to the mold breaking pressure, thereby avoiding the situation in which the mold plate is automatically opened due to the accidental disappearance of the locking pressure during injection molding, thereby improving the locking effect of the locking cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0023] Figure 4 The present invention Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

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

[0025] Figure 6 It is a three-dimensional view of a cylinder body of the present invention.

[0026] Figure 7 It is a stereoscopic view of the clamping piston of the present invention.

[0027] Figure 8 The present invention Figure 7 Front cross-sectional view of .

[0028] Reference numerals: 10. Cylinder body; 11. Cylinder head; 111. First flange; 112. First bolt; 12. Locking cavity; 13. Opening cavity; 14. Locking oil hole; 15. Opening oil hole; 16. First threaded hole; 17. Mounting groove; 20. Locking piston; 21. End groove; 22. Middle groove; 23. Tail groove; 25. Inner sealing groove; 26. Outer sealing groove; 27. Inclined portion; 28. Second threaded hole; 29. ​​Locking groove; 30. Pull rod; 31, connecting column; 311, column body; 312, column head; 313, wing plate; 32, guide column; 33, tail column; 331, threaded portion; 40, sealing member; 41, inner sealing ring; 42, outer sealing ring; 50, boosting mechanism; 51, vertical groove; 52, transverse groove; 53, sealing plug; 531, connecting rod; 60, locking mechanism; 61, locking block; 62, elastic member; 70, second flange; 71, second bolt. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0030] like Figures 1 to 8 As shown, the locking cylinder of the injection molding machine of the present invention includes a cylinder body 10, a locking piston 20, a tie rod 30, a seal 40, a pressurizing mechanism 50 and a locking mechanism 60. A circular cavity is arranged inside the cylinder body 10. The locking piston 20 is slidably arranged in the cavity along the axial direction of the cylinder body 10. The end of the tie rod 30 penetrates into the cavity and is fixed to the locking piston 20. The tie rod 30 can be driven to move when the locking piston 20 moves, so as to lock and break the mold between the movable mold plate and the fixed mold plate. The seal 40 is arranged between the locking piston 20 and the tie rod 30, and between the locking piston 20 and the inner wall of the cylinder body 10. With the cooperation of the pressurizing mechanism 50, the locking piston 20 and the tie rod 30, and the locking piston 20 and the inner wall of the cylinder body 10 can be sealed respectively.

[0031] refer to Figure 1-Figure 3 A cylinder cover 11 is provided at the end of the cylinder body 10 for sealing the cavity. The two ends of the locking piston 20 divide the cavity into a locking cavity 12 and an opening cavity 13. A locking oil hole 14 and an opening oil hole 15 are provided on the side wall of the cylinder body 10. The locking oil hole 14 is connected to the locking cavity 12, and the opening oil hole 15 is connected to the opening cavity 13. Oil can be injected into the locking cavity 12 through the locking oil hole 14. The locking piston 20 moves toward the opening cavity 13 with the pull rod 30 under the pressure of the oil to achieve locking of the movable template and the fixed template. Oil can be injected into the opening cavity 13 through the opening oil hole 15. The locking piston 20 moves toward the locking cavity 12 with the pull rod 30 under the pressure of the oil to achieve demolding of the movable template and the fixed template.

[0032] refer to Figure 1 and Figure 6 A first flange 111 is sleeved on the outside of the cylinder head 11, and 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 surface of the cylinder body 10, and 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 body 10 to seal the cavity.

[0033] refer to Figure 8 The interior of the locking piston 20 is provided with a circular end groove 21, a middle groove 22 and a tail groove 23 in sequence. The end groove 21, the middle groove 22 and the tail groove 23 are coaxially connected and their diameters increase in sequence, which are used for the installation of the tie rod 30.

[0034] refer to Figure 8 The locking piston 20 is provided with an annular inner sealing groove 25 and an outer sealing groove 26. 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 locking piston 20, which is used for installing the seal 40. The locking piston 20 is provided with an inclined portion 27 on the end surface close to the locking oil hole 14, which can increase the contact area between the locking piston 20 and the oil, and increase the force-bearing area of ​​the locking piston 20 during the locking process, so that the locking piston 20 can be better stressed, thereby improving the service life of the locking piston 20.

[0035] refer to Figure 5 The pull 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 connected to the locking piston 20. The guide column 32 passes through and is slidably arranged in the cylinder body 10 and is fixed to the connecting column 31. The tail column 33 is fixedly connected to the end of the guide column 32 away from the tail column 33, and a threaded portion 331 is arranged on the tail column 33 to facilitate the installation between the tail column 33 and the movable template. The guide column 32 has a guiding portion and a mounting portion, and the diameter of the guiding portion is smaller than the mounting portion, so that when the pull rod 30 is installed between the template, it can be guided by the guiding portion for more convenient installation.

[0036] refer to Figure 3 and Figure 8 The connecting column 31 consists 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 fixed to the column body 311, and the column head 312 extends from one end of the column body 311 to the tail groove 23, the wing plate 313 is fixedly installed on the outside of the column head 312 in a ring shape, and the wing plate 313 is located inside the middle groove 22 and is adapted to the size of the middle groove 22.

[0037] refer to Figure 3 , Figure 6 , Figure 7 as well as Figure 8 A second flange 70 is provided inside the tail groove 23, and the second flange 70 is located on one side of the wing plate 313, which can block and limit the wing plate 313 so that the wing plate 313 cannot be separated from the middle groove 22. A second bolt 71 is provided 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 surface of the locking piston 20, and the tail end of the second bolt 71 is threadedly connected in the second threaded hole 28.

[0038] refer to Figure 3 and Figure 8 The sealing member 40 includes an inner sealing ring 41 and an outer sealing ring 42. The inner sealing ring 41 is arranged inside the inner sealing groove 25, and the inner wall of the inner sealing ring 41 is arranged close to the column body 311, so as to seal between the column body 311 and the locking piston 20. The outer sealing ring 42 is arranged inside the outer sealing groove 26, and the outer wall of the outer sealing ring 42 is arranged close to the inner wall of the cylinder body 10, so as to seal between the cylinder body 10 and the locking piston 20.

[0039] refer to 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 connected to each other and are arranged in a T-shape inside the locking piston 20. The two ends of the vertical groove 51 are respectively connected to the inner sealing groove 25 and the outer sealing groove 26. The end of the transverse groove 52 away from the vertical groove 51 is connected to 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 vertical groove 51 and the transverse groove 52 are compressed. The air inside the cylinder 10 increases the internal pressure, forcing the inner sealing ring 41 and the outer sealing ring 42 to move outward from the sealing groove, so that they can be close to the outer wall of the column body 311 and the inner wall of the cylinder body 10, thereby enhancing the sealing effect inside the cylinder body 10 and increasing 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, it can push the sealing plug 53 to slide in the transverse groove 52, thereby applying pressure to the inner sealing ring 41 and the outer sealing ring 42.

[0040] refer to Figure 4The locking mechanism 60 includes a locking block 61 and an elastic member 62. A mounting groove 17 is provided on the inner wall of the cylinder body 10. The locking block 61 is slidably assembled inside the mounting groove 17. The elastic member 62 is arranged between the locking block 61 and the mounting groove 17 to elastically support the locking block 61 so that the locking block 61 can slide in the mounting groove 17. In this solution, the elastic member 62 is specifically a spring. A locking groove 29 adapted to the locking block 61 is provided on the outer wall of the locking piston 20. When the locking piston 20 completes the template locking, the locking groove 29 Aligned with the mounting groove 17, the locking block 61 can be inserted into the locking groove 29 under the push of the elastic member 62, and then the locking piston 20 is locked, so that the locking pressure inside the cylinder 10 suddenly disappears, and the locking piston 20 will not retreat under the restriction of the locking block 61, and then the template can be effectively prevented from accidentally opening during injection molding. The bottom end of the locking block 61 is conical, so that when the locking piston 20 is reset to break the mold, the locking block 61 can be pushed back into the mounting groove 17 under the action of the mold breaking pressure, thereby releasing the lock on the locking piston 20.

[0041] Working principle: During assembly of the mold locking cylinder, the second bolt 71 is inserted into 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, and then the second bolt 71 is screwed into the second threaded hole 28, so that the second flange 70 presses the wing plate 313, fixes the connecting column 31 to the mold locking piston 20, and completes the fixation between the tie rod 30 and the mold locking piston 20, so that when the mold locking piston 20 moves in the cylinder body 10, it can drive the tie rod 30 to move;

[0042] As the second bolt 71 penetrates into the second threaded hole 28, the connecting rod 531 pushes the sealing plug 53 to move in the transverse groove 52, so that the sealing plug 53 compresses the air inside the vertical groove 51 and the transverse groove 52, increases the internal pressure, presses the inner sealing ring 41 and the outer sealing ring 42, so that the inner sealing ring 41 is compressed toward the column body 311 and then closely adheres to the surface of the column body 311, and the outer sealing ring 42 is compressed toward the inner wall of the cylinder body 10 and then closely adheres to the inner wall of the cylinder body 10, so as to achieve sealing between the clamping piston 20 and the tie rod 30, and between the clamping piston 20 and the cylinder body 10;

[0043] The cylinder cover 11 is closed to the end of the cylinder body 10, and 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 cover 11 to the cylinder body 10, so as to seal the cavity of the cylinder body 10. When oil is injected into the locking cavity 12 through the locking oil hole 14, the locking piston 20 can be pushed to move toward the mold opening cavity 13, so that the tie rod 30 moves with the template to lock the mold. When oil is injected into the mold opening cavity 13 through the mold opening oil hole 15, the locking piston 20 can be pushed to move toward the locking cavity 12, so that the tie rod 30 moves with the template to break the mold.

[0044] When the locking piston 20 moves to complete the locking, the locking groove 29 stays at one side of the mounting groove 17 and communicates with it, so that the locking block 61 can be automatically inserted into the locking groove 29 to lock the locking piston 20 under the push of the elastic member 62; when the locking piston 20 moves to break the mold, the locking piston 20 can push the locking block 61 to rise and enter the mounting groove 17 under the thrust of the oil pressure, and automatically release the lock on the locking piston 20.

[0045] In the present invention, the locking piston 20 and the tie rod 30 are fixed by the second flange 70, so that the locking piston 20 pushes the tie rod 30 to move during the locking process. Compared with the direct threaded connection method, the flange connection method makes the tie rod 30 more evenly stressed, which can effectively reduce the pressure on the tie rod 30 during the locking process, and avoids the problem of thread breakage between the locking piston 20 and the tie rod 30 leading to reduced sealing. While fixing the locking 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, so that the inner sealing ring 41 and the outer sealing ring 42 are compressed and deformed, and fully fill the respective sealing grooves. , and then closely adhere to the surface of the tie rod 30 and the inner wall of the cylinder body 10, effectively reducing the deformable space of the inner sealing ring 41 and the outer sealing ring 42, so that the inner sealing ring 41 and the outer sealing ring 42 are not easy to be further compressed during the use of the oil cylinder, and then are not easy to separate from the tie rod 30 and the cylinder body 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 locking is completed, the locking block 61 can be used to automatically lock the mold locking piston 20, so that the mold locking piston 20 cannot move when it is not subjected to the mold breaking pressure, and then it can avoid the situation where the mold plate is automatically opened due to the accidental disappearance of the mold locking pressure during injection molding, thereby improving the locking effect of the mold locking cylinder.

[0046] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary 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 pull rod (30) comprises a connecting column (31), the connecting column (31) passes through the interior of the mold locking piston (20) and is fixed to the mold locking piston (20) via a second flange (70); 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 interior of the mold locking piston (20) is provided with circular end grooves (21), middle grooves (22) and tail grooves (23) in sequence; the end grooves (21), middle grooves (22) and tail grooves (23) are coaxially connected and their diameters increase in sequence.

4. The clamping cylinder of the injection molding machine according to claim 3, 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).

5. The clamping cylinder of the injection molding machine according to claim 4, characterized in that: The second flange (70) is arranged inside the tail groove (23) and is located on one side of the wing plate (313); the end of the clamping piston (20) is provided with a second threaded hole (28) corresponding to the flange hole of the second flange (70); a second bolt (71) is arranged in the flange hole of the second flange (70); and the tail end of the second bolt (71) is threadedly connected in the second threaded hole (28).

6. The clamping cylinder of the injection molding machine according to claim 5, characterized in that: The second threaded hole (28) is in communication with the transverse groove (52), and a connecting rod (531) is provided between the sealing plug (53) and the second bolt (71).

7. 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).

8. 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).

9. 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).

10. 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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