A locking oil cylinder connecting structure for an injection molding machine

Abstract

The application discloses a locking oil cylinder connecting structure for an injection molding machine, which is characterized in that a first spherical surface structure is arranged at one end of a piston rod of the locking oil cylinder, a convex circular arc surface is arranged on a nut, and a concave circular arc surface is arranged on a nut pad block, so that when a micro-arch deformation of a movable die plate occurs, the first spherical surface structure can slightly move in a cylinder sleeve, thereby reducing the eccentricity of the piston rod caused by the deformation of the movable die plate; meanwhile, the piston rod offset drives the nut to offset, so that the convex circular arc surface on the nut relatively slides along the concave circular arc surface of the nut pad block, so that the piston rod cannot keep a deformed state, and the piston rod can keep in the center position of the cylinder sleeve, thereby effectively preventing the occurrence of oil seepage.

Description

Technical Field

[0001] This invention relates to the field of injection molding, and more specifically to a clamping cylinder connection structure for an injection molding machine. Background Technology

[0002] Injection molding machines are specialized plastic molding machines. Based on their structure, they can be broadly classified into two-platen injection molding machines, horizontal injection molding machines, vertical injection molding machines, and angle injection molding machines. As shown in the figure, the injection mold of an injection molding machine consists of two parts: a moving mold and a fixed mold. The moving mold is mounted on the moving platen of the injection molding machine, and the fixed mold is mounted on the fixed platen. During injection molding, the moving mold and the fixed mold close to form the gating system and the cavity. When the mold opens, the moving mold and the fixed mold separate to remove the plastic product.

[0003] The clamping cylinder is mainly responsible for closing the mold and bearing the mold's tension and impact; such as Figure 3 As shown, the mold-locking cylinder includes: a cylinder sleeve 101, a piston rod 102, and a piston 103 connected to one end of the piston rod 102 and capable of reciprocating inside the cylinder sleeve 101. One end of the piston rod 102 is fixedly connected to the moving mold through a connecting structure.

[0004] However, due to prolonged use of the mold, the moving mold plate may undergo slight arching deformation under the combined action of the tie rod tension and the mold pressure. At the same time, when the high-pressure cylinder locks the mold and applies high pressure, the moving and fixed mold plates will also have a certain degree of elastic deformation, which is the aforementioned slight arching deformation (similar to a drawn bow). This causes the piston rod of the mold-locking oil to become eccentric due to deformation, resulting in poor sealing between the mold and the mold-locking oil cylinder, causing oil leakage.

[0005] Therefore, overcoming the aforementioned shortcomings has become an important issue that urgently needs to be addressed by those skilled in the art. Summary of the Invention

[0006] This invention provides a connection structure for the clamping cylinder of an injection molding machine, bringing a new sealing architecture to the clamping cylinder of the injection molding machine, and avoiding the situation where the piston rod of the cylinder and the cylinder are eccentric and leak oil due to the sag of the excessively long straight clamping cylinder under gravity and the deformation of the middle plate of the high pressure head.

[0007] A clamping cylinder connection structure for an injection molding machine includes: a first connection structure 1 for connecting to a moving platen 200 and disposed on a piston rod 102 of the clamping cylinder; the first connection structure 1 includes: a first spherical structure 11 with a protrusion formed on one end of the piston rod 102 of the clamping cylinder, a nut pad 12, a nut 13, a cylinder pressure plate 14, and a first screw 15; the nut pad 12 and the nut 13 are sequentially fitted into the piston rod 102 along its outer circumferential surface to connect to the piston rod 102. On the outer circumferential surface of the other end of the piston rod 102, the first screw 15 passes through the cylinder pressure plate 14, nut 13, nut pad 12 and moving template 200 in sequence, and connects one end of the piston rod 102 to the moving template 200 by tightening and seals the first spherical structure 11. The surface of the nut 13 and the nut pad 12 is a convex arc surface 131 that arches towards the nut pad 12. The nut pad 12 forms a concave arc surface 121 along which the convex arc surface 131 slides.

[0008] Preferably, it further includes: a second connecting structure 2 connected to one end of the cylinder sleeve 101 of the mold-locking cylinder for connecting to an external oil circuit structure. The second connecting structure 2 is located at one end near the first connecting structure 1. The second connecting structure 2 includes: a first connecting flange 21, a first cylinder front cover 22, a cylinder bushing 23, a second connecting flange 24, a first spring washer 25, a second screw 26, a first sealing connection structure, a second sealing connection structure, and a third sealing connection structure. The first connecting flange 21 is fixedly connected to the outermost side wall of the cylinder sleeve 101. The first cylinder front cover 22 is arranged side by side to the right of the first connecting flange 21 by inserting a portion of it into the inner side wall of the rightmost end of the cylinder sleeve 101. The outer side wall of the cylinder bushing 23 has a first protrusion 230. A portion of the cylinder bushing 23 is inserted into the interior of the first cylinder front cover 22, and a portion of the first protrusion 230 abuts against the first cylinder front cover 22. The connecting flange 24 is inserted along the outer wall of the cylinder valve 23 and located on the right side of the first cylinder front cover 22, abutting against the outer wall of another part of the first protrusion 230. The second screw 26 passes through the second connecting flange 24, the first cylinder front cover 22, and the first connecting flange 21 from right to left and is tightened to clamp the first cylinder front cover 22 and the second connecting flange 24 and to clamp the first protrusion 230 between the first cylinder front cover 22 and the second connecting flange 24. The inner wall of the cylinder valve 23 is connected to the outer wall of the piston rod 102 through the first sealing connection structure. The first spring washer 25 is sandwiched between the heads of the second connecting flange 24 and the second screw 26. The first cylinder front cover 22 has a first oil port 221. The second sealing connection structure is connected between the inner wall of the first cylinder front cover 22 and the outer wall of the cylinder valve 23. The third sealing connection structure is connected at the engagement point of the cylinder liner 101 and the first cylinder front cover 22.

[0009] Preferably, the inner wall of the hydraulic cylinder copper sleeve 23 is provided with a first annular groove 231, a second annular groove 232, a third annular groove 233, a fourth annular groove 234, and a fifth annular groove 235 from right to left. The first annular groove 231 communicates with the outside and a dustproof sealing ring 271 is sandwiched between the first annular groove 231 and the outer wall of the piston rod 102. The second annular groove 232 is sandwiched between the second annular groove 232 and the outer wall of the piston rod 102. The third annular groove 233 is sandwiched between the third annular groove 233 and the outer wall of the piston rod 102. The fourth annular groove 234 is sandwiched between the fourth annular groove 234 and the outer wall of the piston rod 102. The fifth annular groove 235 is sandwiched between the fifth annular groove 235 and the outer wall of the piston rod 102. The dustproof sealing ring 271, the first wear-resistant ring 272, the first oil seal 273, the second oil seal 274, and the second wear-resistant ring 275 constitute the first sealing connection structure.

[0010] Preferably, the second sealing connection structure is a first circular ring 28 sandwiched between the inner side wall of the first cylinder front cover 22 and the outer side wall of the cylinder sleeve 23; the third sealing connection structure includes a first back pressure ring 291 and a second circular ring 292 sandwiched between the inner side wall of the cylinder liner 101 and the outer side wall of the first cylinder front cover 22.

[0011] Preferably, it further includes: a third connecting structure 3 connected to the other end of the cylinder sleeve 101 of the mold-locking cylinder for connecting to an external oil circuit structure. The third connecting structure 3 includes: a third connecting flange 31 fixedly connected to the outermost wall of the leftmost end of the cylinder sleeve 101 of the mold-locking cylinder; a cylinder rear cover 32 partially inserted into the inner wall of the leftmost end of the cylinder sleeve 101 and arranged side by side on the left side of the third connecting flange 31; and a third screw 33 passing through the cylinder rear cover 32 and the third connecting flange 31 in sequence. The third screw 33 locks the cylinder rear cover 32 and the third connecting flange 31 together by tightening. A second back pressure ring 34 and a third round ring 35 are clamped at the engagement point between the cylinder rear cover 32 and the cylinder sleeve 101. A second spring washer 36 is provided between the head of the cylinder rear cover 32 and the third screw 33. A second oil port 321 is opened on the cylinder rear cover 32.

[0012] Preferably, it further includes: a fourth connection structure 4 for connecting with the fixed template 300, the fourth connection structure 4 including: a connecting plate 41 fixedly connected to the outer wall of the cylinder liner 101, a fourth screw 42 passing through the connecting plate 41 and the fixed template 300 and fixedly connected to the fixed template 300 by tightening, and a third spring washer 43 clamped between the head of the connecting plate 41 and the head of the fourth screw 42.

[0013] Preferably, it further includes: a fifth connecting structure 5 disposed between the inner wall of the cylinder liner 101 and the piston 103, the fifth connecting structure 5 including: one or more third wear-resistant rings 51 sandwiched between the inner wall of the cylinder liner 101 and the outer wall of the piston 103, and a third oil seal 52 sandwiched between the inner wall of a third wear-resistant ring 51 and the outer wall of the piston 103.

[0014] Preferably, a fourth circular ring 6 is sandwiched between the piston rod 102 and the piston 103.

[0015] Preferably, the surfaces of the first spherical structure 11, the convex arc surface 131, and the concave arc surface 121 are padded with steel-based lead-free self-lubricating plates.

[0016] Preferably, the nut 13 is a core nut and the first screw 15 is a cup head screw.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The first spherical structure at one end of the piston rod of the mold-locking cylinder, the convex arc surface on the nut, and the concave arc surface of the nut pad are designed to allow the first spherical structure to move slightly in the cylinder sleeve when the moving mold plate undergoes slight arching deformation. This reduces the piston rod eccentricity caused by the deformation of the moving mold plate. Simultaneously, the piston rod offset causes the nut to offset, allowing the convex arc surface on the nut to slide relative to the concave arc surface of the nut pad. This prevents the piston rod from remaining deformed and keeps it centered in the cylinder sleeve, effectively preventing oil leakage. The cylinder pressure plate protects the sealing elements inside the mold-locking cylinder from external contaminants, increasing the cylinder's sealing performance, preventing oil leakage, and extending the cylinder's service life.

[0019] 2. The first connecting flange, first cylinder front cover, cylinder bushing, second connecting flange, first spring washer, second screw, and first oil port of the second connecting structure in this case are designed to facilitate subsequent oil supply circuit connection. The first cylinder front cover protects its internal sealing elements from contaminants, thus ensuring the sealing performance and normal operation of the mold-locking cylinder. The spring washer enhances the friction between the second screw and the second connecting flange, achieving better connection and tightening. The first, second, and third sealing connection structures are designed to provide a good sealing effect.

[0020] 3. The first and second oil seals of the first sealing connection structure in this case form two seals to prevent leakage when the shafts are misaligned. In this case, if the first oil seal fails to withstand the pressure, the second oil seal compensates for the leakage, resulting in a good sealing effect. The dustproof sealing ring prevents external dust from entering, providing protection and sealing. The first and second wear-resistant rings provide wear resistance and support, preventing damage caused by metal-to-metal contact, thereby avoiding leakage and damage to the seals and components. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the locking cylinder connected to the fixed template and the moving template.

[0022] Figure 2 This is a schematic diagram of the application of the mold-locking cylinder connection structure in this case on the mold-locking cylinder.

[0023] Figure 3 This is a cross-sectional schematic diagram of the mold-locking cylinder connected to the fixed mold plate and the moving mold plate.

[0024] Figure 4 yes Figure 3 Enlarged diagram of point A.

[0025] Figure 5 yes Figure 3 Enlarged diagram of point B.

[0026] Figure 6 yes Figure 3 Enlarged diagram of point C.

[0027] Figure 7 yes Figure 3 Enlarged diagram of point D.

[0028] Figure 8 This is a schematic diagram of the piston rod. Detailed Implementation

[0029] The following examples further illustrate the features and other related characteristics of the present invention to facilitate understanding by those skilled in the art:

[0030] like Figures 1 to 8As shown, a clamping cylinder connection structure for an injection molding machine is disclosed. The connection structure is disposed on the clamping cylinder, which includes: a cylinder sleeve 101, a piston rod 102, and a piston 103 connected to one end of the piston rod 102 and capable of reciprocating within the cylinder sleeve 101. The connection structure of this invention includes: a first connection structure 1 for connecting to the moving platen 200 and disposed at the other end of the piston rod 102 of the clamping cylinder; a second connection structure 2 connected to one end of the cylinder sleeve 101 of the clamping cylinder and for connecting to a certain oil passage of an external oil passage structure; a third connection structure 3 connected to the other end of the cylinder sleeve 101 of the clamping cylinder and for connecting to another oil passage of an external oil passage structure; and a fourth connection structure 4 connected to the outer wall of the cylinder sleeve 101 for connecting to the fixed platen 300.

[0031] The first connecting structure 1 includes: a first spherical structure 11 protruding on one end of the piston rod 102 of the locking cylinder, a nut pad 12, a nut 13, a cylinder pressure plate 14, and a first screw 15. The nut pad 12 and the nut 13 are sequentially fitted onto the outer circumferential surface of the piston rod 102 and connected to the outer circumferential surface of the other end of the piston rod 102. The first screw 15 passes sequentially through the cylinder pressure plate 14, the nut 13, the nut pad 12, and the moving template 200, and is tightened to connect one end of the piston rod 102 to the moving template 200, while simultaneously sealing the first spherical structure 11. The surface where the nut 13 connects with the nut pad 12 is a convex arc surface 131 that arches towards the nut pad 12. The nut pad 12 forms a concave arc surface 121 along which the convex arc surface 131 slides. In specific implementation, the first spherical structure 11 protrudes in a slightly arched direction towards the moving template 200. The piston rod 102 has an external thread on its outer circumference that engages with the internal thread of the nut 13.

[0032] As described above, the first spherical structure 11 at one end of the piston rod 102 of the locking cylinder, the convex arc surface 131 on the nut 13, and the concave arc surface 121 on the nut pad 12 can reduce the eccentricity of the piston rod 102 caused by the deformation of the moving template when the moving template undergoes a slight arching deformation. At the same time, the offset of the piston rod 102 causes the nut 13 to offset, so that the convex arc surface 131 on the nut 13 slides relative to the concave arc surface 121 on the nut pad 12, so that the piston rod 102 will not remain in a deformed state, thus keeping the piston rod 102 in the center position of the cylinder pad 101 and effectively preventing oil leakage. The hydraulic cylinder pressure plate 14 protects the sealing elements inside the mold-locking cylinder from external contaminants and, together with the first screw 15, pulls the moving template 200 back. This improves the sealing performance of the cylinder, preventing oil leakage and extending its service life. It also reduces deformation of the moving template 200. In practice, the hydraulic cylinder pressure plate 14 is not fitted onto the outer circumference of the piston rod 102. When the mold-locking cylinder pushes outward, the hydraulic cylinder pressure plate 14 is pushed outward by the cylinder and pulled outward by the first screw 15, thus reducing deformation.

[0033] Furthermore, the second connecting structure 2 and the third connecting structure 3 are provided to facilitate a subsequent sealed connection with the oil circuit. The fourth connecting structure 4 is provided to fix the cylinder sleeve 101 of the mold-locking cylinder to the fixed platen 300, ensuring the connection stability of the mold-locking cylinder.

[0034] like Figure 3 and Figure 5 As shown, the second connecting structure 2 is located at one end close to the first connecting structure 1. The second connecting structure 2 includes: a first connecting flange 21, a first cylinder front cover 22, a cylinder bushing 23, a second connecting flange 24, a first spring washer 25, a second screw 26, a first sealing connecting structure, a second sealing connecting structure, and a third sealing connecting structure.

[0035] The first connecting flange 21 is fixedly connected to the outermost side wall of the cylinder liner 101. The first cylinder front cover 22 is partially inserted into the inner side wall of the rightmost end of the cylinder liner 101 and is arranged side by side with the first connecting flange 21 to the right. The outer side wall of the cylinder bushing 23 has a first protrusion 230. A part of the cylinder bushing 23 is inserted into the interior of the first cylinder front cover 22 and abuts against a part of the first protrusion 230. The second connecting flange 24 is inserted along the outer side wall of the cylinder bushing 23 and is located on the right side of the first cylinder front cover 22, abutting against the outer side wall of another part of the first protrusion 230. The second screw 26 passes through the second connecting flange 24, the first cylinder bushing 23, the second cylinder front cover 22, and the first cylinder front cover 22 to the right. A cylinder front cover 22 and a first connecting flange 21 are tightened to clamp the first cylinder front cover 22 and the second connecting flange 24, and to clamp the first protrusion 230 between the first cylinder front cover 22 and the second connecting flange 24. The inner wall of the cylinder bushing 23 is connected to the outer wall of the piston rod 102 through a first sealing connection structure. The first spring washer 25 is sandwiched between the head of the second connecting flange 24 and the second screw 26. The first cylinder front cover 22 has a first oil port 221. The second sealing connection structure is connected between the inner wall of the first cylinder front cover 22 and the outer wall of the cylinder bushing 23. The cylinder liner 101 and the first cylinder front cover 22 are connected to the third sealing connection structure at the clamping point.

[0036] As described above, the second connecting structure 2 includes a first connecting flange 21, a first cylinder front cover 22, a cylinder bushing 23, a second connecting flange 24, a first spring washer 25, a second screw 26, and a first oil port 221 to facilitate subsequent oil supply connection. The first cylinder front cover 22 protects its internal sealing elements from contaminants, ensuring the sealing performance and normal operation of the mold-locking cylinder. The spring washer 25 enhances the friction between the second screw 26 and the second connecting flange 24, achieving better connection and tightening. The first, second, and third sealing connection structures ensure a good sealing effect.

[0037] like Figure 5As shown, the inner wall of the hydraulic cylinder copper bushing 23 is provided with a first annular groove 231, a second annular groove 232, a third annular groove 233, a fourth annular groove 234, and a fifth annular groove 235 from right to left. The first annular groove 231 communicates with the outside and a dustproof sealing ring 271 is sandwiched between the first annular groove 231 and the outer wall of the piston rod 102. The second annular groove 232 is sandwiched between the second annular groove 232 and the outer wall of the piston rod 102. The third annular groove 233 is sandwiched between the third annular groove 233 and the outer wall of the piston rod 102. The fourth annular groove 234 is sandwiched between the fourth annular groove 234 and the outer wall of the piston rod 102. The fifth annular groove 235 is sandwiched between the fifth annular groove 235 and the outer wall of the piston rod 102. The dustproof sealing ring 271, the first wear-resistant ring 272, the first oil seal 273, the second oil seal 274, and the second wear-resistant ring 275 constitute the first sealing connection structure.

[0038] As described above, the first oil seal 273 and the second oil seal 274 of the first sealing connection structure form two seals to prevent leakage when the shafts are misaligned. If the first oil seal 273 fails to withstand the pressure, the second oil seal 274 compensates for the leakage, resulting in a good sealing effect. The dustproof sealing ring 271 prevents external dust from entering, providing protection and sealing. The first wear-resistant ring 272 and the second wear-resistant ring 275 provide wear resistance and support, preventing damage caused by metal-to-metal contact, thereby avoiding leakage and damage to the seals and components.

[0039] like Figure 5 As shown, in a specific implementation, the second sealing connection structure is a first circular ring 28 sandwiched between the inner wall of the first cylinder front cover 22 and the outer wall of the cylinder sleeve 23. The third sealing connection structure includes a first back pressure ring 291 and a second circular ring 292 sandwiched between the inner wall of the cylinder sleeve 101 and the outer wall of the first cylinder front cover 22. Thus, the first circular ring 28 and the second circular ring 292 help prevent oil leakage, ensure the pressure inside the cylinder and the purity of the oil, and further improve the sealing performance of the connection structure. The first back pressure ring 291 can seal the oil in the mold-locking cylinder, prevent the oil from flowing outward, and prevent the oil from leaking into the environment, which helps to ensure the sealing performance of the mold-locking cylinder.

[0040] like Figure 6As shown, in specific implementation, the connection structure of the mold-locking cylinder in this case further includes: a third connection structure 3 connected to the other end of the cylinder sleeve 101 of the mold-locking cylinder for connection with the external oil circuit structure. The third connection structure 3 includes: a third connection flange 31 fixedly connected to the outermost wall of the leftmost end of the cylinder sleeve 101 of the mold-locking cylinder; a cylinder rear cover 32 partially inserted into the inner wall of the leftmost end of the cylinder sleeve 101 and arranged side by side on the left side of the third connection flange 31; and a third screw 33 passing through the cylinder rear cover 32 and the third connection flange 31 in sequence. The third screw 33 locks the cylinder rear cover 32 and the third connection flange 31 together by tightening. A second back pressure ring 34 and a third round ring 35 are clamped at the engagement point between the cylinder rear cover 32 and the cylinder sleeve 101. A second spring washer 36 is provided between the head of the cylinder rear cover 32 and the third screw 33. A second oil port 321 is opened on the cylinder rear cover 32.

[0041] As described above, the third connecting structure 3 allows an external oil passage to be connected to supply pressurized oil to the mold-locking cylinder. Simultaneously, it cooperates with the second connecting structure 2 to allow another oil passage to be connected, ensuring pressurized oil on both sides of the piston, thus generating greater thrust in the cylinder. The cylinder rear cover 32 provides a sealing and protective function. The second back pressure ring 34 prevents oil from flowing out of the pipeline. The third circular ring 35 prevents oil leakage.

[0042] like Figure 2 As shown, in a specific implementation, the connection structure of the locking cylinder in this case further includes a fourth connection structure 4 for connecting with the fixed template 300. The fourth connection structure 4 includes: a connecting plate 41 fixedly connected to the outer wall of the cylinder sleeve 101; a fourth screw 42 passing through the connecting plate 41 and the fixed template 300 and fixedly connected to the fixed template 300 by tightening; and a third spring washer 43 clamped between the heads of the connecting plate 41 and the fourth screw 42. This facilitates the stable and fixed connection of the cylinder sleeve 101 to the fixed template 300.

[0043] like Figure 7 As shown, in a specific implementation, the connection structure of the mold-locking cylinder in this case further includes a fifth connection structure 5 disposed between the inner wall of the cylinder liner 101 and the piston 103. The fifth connection structure 5 includes one or more third wear-resistant rings 51 sandwiched between the inner wall of the cylinder liner 101 and the outer wall of the piston 103, and a third oil seal 52 sandwiched between the inner wall of one of the third wear-resistant rings 51 and the outer wall of the piston 103. Thus, good wear resistance and sealing are achieved between the cylinder liner 101 and the piston 103.

[0044] like Figure 7As shown, in a specific implementation, a fourth circular ring 6 is sandwiched between the piston rod 102 and the piston 103. This is to prevent oil leakage and ensure the pressure inside the cylinder and the purity of the oil.

[0045] As described above, the surfaces of the first spherical structure 11, the convex arc surface 131, and the concave arc surface 121 are padded with steel-based lead-free self-lubricating plates. In specific implementations, thin copper plates may also be used. This allows the steel-based lead-free self-lubricating plates to provide good lubrication, which facilitates slight movement of the first spherical structure 11 and allows for easier relative sliding between the convex arc surface 131 and the concave arc surface 121, reducing the impact of deformation of the moving template 200 on the piston rod 102. Furthermore, it also helps to reduce friction and wear.

[0046] As described above, in specific implementation, the nut 13 is a core nut, which has a very smooth surface, is not prone to rust, will not cause electrochemical corrosion to the connected parts, and will not pollute the environment. By ensuring the firmness and stability of the connection, its service life is improved. The first screw 15 is a cup-head screw, which, compared with ordinary screws, provides a more stable connection and is easier to install.

[0047] As stated above, this case protects a clamping cylinder connection structure for injection molding machines, and all technical solutions that are the same as or similar to this case should be considered to fall within the protection scope of this case.

Claims

1. A clamping cylinder connection structure for an injection molding machine, characterized in that... include: A first connecting structure (1) for connecting to the piston rod (102) of the mold-locking cylinder on the moving template (200), the first connecting structure (1) includes: a first spherical structure (11) protruding on one end of the piston rod (102) of the mold-locking cylinder, a nut pad (12), a nut (13), a cylinder pressure plate (14), and a first screw (15). The nut pad (12) and the nut (13) are sequentially fitted onto the outer circumferential surface of the piston rod (102) and connected to the outer circumferential surface of the other end of the piston rod (102). The screw (15) passes sequentially through the cylinder pressure plate (14), nut (13), nut washer (12), and moving template (200), and is tightened to connect one end of the piston rod (102) to the moving template (200) and seal the first spherical structure (11). The surface where the nut (13) and nut washer (12) connect is a convex arc surface (131) that arches towards the nut washer (12). The nut washer (12) forms a concave arc surface (121) along which the convex arc surface (131) slides. The first spherical structure (11) The piston rod (102) protrudes in the direction of the slight arch of the moving template (200), and the outer circumferential surface of the piston rod (102) is provided with an external thread that is connected to the internal thread of the nut (13); a fourth circular ring (6) is sandwiched between the piston rod (102) and the piston (103); the first spherical structure (11), the convex arc surface (131), and the concave arc surface (121) are padded with steel-based lead-free self-lubricating plates, and the first spherical structure (11) can move relative to the cylinder sleeve (101) of the locking cylinder when the moving template (200) undergoes a slight arch deformation, and the piston rod (102) eccentricity caused by the deformation of the moving template (200) is reduced by the cooperation of the first spherical structure (11), the convex arc surface (131), and the concave arc surface (121).

2. The clamping cylinder connection structure for an injection molding machine according to claim 1, characterized in that... Also includes: A second connecting structure (2) for connecting to an external oil circuit structure is connected to one end of the cylinder liner (101) of the mold-locking cylinder. The second connecting structure (2) is located at one end near the first connecting structure (1). The second connecting structure (2) includes: a first connecting flange (21), a first cylinder front cover (22), a cylinder bushing (23), a second connecting flange (24), a first spring washer (25), a second screw (26), a first sealing connection structure, a second sealing connection structure, and a third sealing connection structure. The connecting flange (21) is fixedly connected to the outermost side wall of the cylinder liner (101). The first cylinder front cover (22) is arranged side by side with the first connecting flange (21) by inserting a part of it into the inner side wall of the rightmost end of the cylinder liner (101). The outer side wall of the cylinder bushing (23) is provided with a first protrusion (230). A part of the cylinder bushing (23) is inserted into the first cylinder front cover (22) and a part of the first protrusion (230) abuts against the first cylinder front cover (22). The second connecting flange (21) is fixedly connected to the outermost side wall of the cylinder liner (101). 4) The second screw (26) is inserted along the outer wall of the cylinder copper fitting (23) and located on the right side of the first cylinder front cover (22) and abutting against the outer wall of the other part of the first protrusion (230). The second screw (26) passes through the second connecting flange (24), the first cylinder front cover (22), and the first connecting flange (21) from right to left and is tightened to clamp the first cylinder front cover (22) and the second connecting flange (24) and to clamp the first protrusion (230) between the first cylinder front cover (22) and the second connecting flange (24). The inner wall of (23) is connected to the outer wall of the piston rod (102) through the first sealing connection structure. The first spring washer (25) is sandwiched between the head of the second connecting flange (24) and the second screw (26). The first oil cylinder front cover (22) has a first oil port (221). The second sealing connection structure is connected between the inner wall of the first oil cylinder front cover (22) and the outer wall of the oil cylinder copper sleeve (23). The third sealing connection structure is connected at the snap-fit ​​joint between the cylinder liner (101) and the first oil cylinder front cover (22).

3. The clamping cylinder connection structure for an injection molding machine according to claim 2, characterized in that... The inner wall of the hydraulic cylinder copper fitting (23) is provided with a first annular groove (231), a second annular groove (232), a third annular groove (233), a fourth annular groove (234), and a fifth annular groove (235) from right to left. The first annular groove (231) is connected to the outside and a dustproof sealing ring (271) is sandwiched between the first annular groove (231) and the outer wall of the piston rod (102). The second annular groove (232) is sandwiched between the second annular groove (232) and the outer wall of the piston rod (102). A first oil seal (273) is sandwiched between the three annular grooves (233) and the outer wall of the piston rod (102); a second oil seal (274) is sandwiched between the fourth annular groove (234) and the outer wall of the piston rod (102); and a second wear-resistant ring (275) is sandwiched between the fifth annular groove (235) and the outer wall of the piston rod (102). The dustproof sealing ring (271), the first wear-resistant ring (272), the first oil seal (273), the second oil seal (274), and the second wear-resistant ring (275) constitute the first sealing connection structure.

4. A clamping cylinder connection structure for an injection molding machine according to claim 2 or 3, characterized in that... The second sealing connection structure is a first circular ring (28) sandwiched between the inner wall of the first cylinder front cover (22) and the outer wall of the cylinder copper sleeve (23); the third sealing connection structure includes a first back pressure ring (291) and a second circular ring (292) sandwiched between the inner wall of the cylinder liner (101) and the outer wall of the first cylinder front cover (22).

5. The clamping cylinder connection structure for an injection molding machine according to claim 1, characterized in that... Also includes: A third connecting structure (3) for connecting to an external oil circuit structure is connected to the other end of the cylinder sleeve (101) of the mold-locking cylinder. The third connecting structure (3) includes: a third connecting flange (31) fixedly connected to the outermost wall of the leftmost end of the cylinder sleeve (101) of the mold-locking cylinder; a cylinder rear cover (32) partially inserted into the inner wall of the leftmost end of the cylinder sleeve (101) and arranged side by side on the left side of the third connecting flange (31); and a cylinder rear cover (32) passing through the cylinder rear cover (32) and the third connecting flange in sequence. (31) The third screw (33) locks the cylinder rear cover (32) and the third connecting flange (31) together by tightening; the cylinder rear cover (32) and the cylinder liner (101) are clamped with a second back pressure ring (34) and a third round ring (35); a second spring washer (36) is provided between the head of the cylinder rear cover (32) and the third screw (33); and a second oil port (321) is opened on the cylinder rear cover (32).

6. The clamping cylinder connection structure for an injection molding machine according to claim 1, characterized in that... Also includes: A fourth connection structure (4) for connecting with a fixed template (300) includes: a connecting plate (41) fixedly connected to the outer wall of the cylinder liner (101); a fourth screw (42) passing through the connecting plate (41) and the fixed template (300) and fixedly connected to the fixed template (300) by tightening; and a third spring washer (43) clamped between the head of the connecting plate (41) and the head of the fourth screw (42).

7. The clamping cylinder connection structure for an injection molding machine according to claim 1, characterized in that... Also includes: A fifth connection structure (5) is provided between the inner wall of the cylinder liner (101) and the piston (103). The fifth connection structure (5) includes: one or more third wear-resistant rings (51) sandwiched between the inner wall of the cylinder liner (101) and the outer wall of the piston (103), and a third oil seal (52) sandwiched between the inner wall of a third wear-resistant ring (51) and the outer wall of the piston (103).

8. The clamping cylinder connection structure for an injection molding machine according to claim 1, characterized in that... The nut (13) is a core nut, and the first screw (15) is a cup head screw.

Images