CN210362315U

CN210362315U - Auxiliary demoulding device of injection molding machine

Info

Publication number: CN210362315U
Application number: CN201920601536.7U
Authority: CN
Inventors: 孙其义; 张�浩
Original assignee: Nanjing Longyu Electronic Technology Co ltd
Current assignee: Nanjing Longyu Electronic Technology Co ltd
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2020-04-21
Anticipated expiration: 2029-04-28

Abstract

The utility model discloses an auxiliary demoulding device of an injection molding machine, which comprises a machine body, a base arranged on one side of the machine body, a movable mould and a fixed mould which are arranged on the base and matched in a concave-convex way, a supporting block and two clamping plates which are oppositely arranged on the supporting block, a first cavity is formed between the opposite side walls of the fixed die and the movable die, a feed inlet communicated with the first cavity is formed in the side wall of the fixed die facing the machine body, the base is provided with a sliding component for driving the movable mould to move along the length direction of the movable mould, the upper surface of the base is positioned at one side of the fixed mould and is provided with an opening for the supporting block to pass through along the length direction of the fixed mould, a second cavity for collecting finished products is reserved in the base, a lifting assembly for driving the supporting block to move along the height direction of the base is arranged in the second cavity, and a driving assembly for driving the two clamping plates to approach or depart from each other is arranged on the supporting block; this shedder does not need the staff to take out the finished product manually, labour saving and time saving, and machining efficiency is high.

Description

Auxiliary demoulding device of injection molding machine

Technical Field

The utility model relates to an injection mold's technical field, in particular to supplementary shedder of injection molding machine.

Background

An injection mould for mass production of parts with complex shape is composed of mould cavity, and two parts including moving mould and fixed mould (or male mould and female mould) which can be separated from each other.

However, the existing mold has the following use limitations: the injection molding machine will be heated the material that melts and mould plastics the die cavity and cool off fixedly, need the staff to take out the finished product, at the die sinking in-process, the condition of movable mould and product adhesion often can appear, is difficult to take off the product from the movable mould, because the injection molding machine need process hundreds of work pieces every day, greatly increased staff's intensity of labour, machining efficiency is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an auxiliary demoulding device of injection molding machine, its advantage is: the die can avoid adhesion of a finished product and the movable die, does not need workers to manually take out the finished product, saves time and labor, and improves the processing efficiency.

The above technical purpose of the present invention can be achieved by the following technical solutions:

the utility model provides an auxiliary demoulding device of injection molding machine, includes the organism, sets up the base in organism one side, sets up unsmooth complex movable mould and cover half on the base, still includes supporting shoe and two relative grip blocks that set up on the supporting shoe, be formed with first cavity between the relative lateral wall of cover half and movable mould, the cover half is equipped with the feed inlet that is linked together with first cavity towards the lateral wall of organism, be equipped with the subassembly that slides that the drive movable mould removed along its length direction on the base, one side that the upper surface of base is located the cover half is equipped with the opening that supplies the supporting shoe to pass along its length direction, it has the second cavity of collecting the finished product to reserve in the base, be equipped with the lifting unit that the drive supporting shoe removed along base direction of height in the second cavity, be equipped with the drive assembly that two grip blocks of drive are.

According to the technical scheme, firstly, through the feeding hole, the machine body can inject blanks into the first cavity for cooling and forming; secondly, driving the movable mold to be far away from the fixed mold by using the sliding assembly, and adhering the finished product to the fixed mold; then, the lifting assembly is used for driving the supporting block to penetrate through the opening, and the upper surface of the supporting block abuts against the lower surface of the finished product, so that the finished product is displaced up and down, and the finished product is convenient to take out; finally, the driving assembly is utilized to drive the two clamping plates to approach each other, so that the clamping plates are attached to the side walls of the finished product and can clamp the finished product; the lifting assembly is used for driving the supporting block to move downwards, so that the finished product moves downwards into the second cavity, the driving assembly is used for driving the two clamping plates to be away from each other, the finished product falls into the second cavity, and finally the collection of the product is realized; the demoulding device with the structure does not need workers to manually take out the injection-molded finished product, can prevent the finished product from being adhered to the fixed die, saves labor and improves the processing efficiency.

The utility model discloses further set up to: the base is located open-ended one side and is equipped with the groove of sliding along its length direction, the subassembly of sliding including set up first motor on the base end wall, rotate the screw rod that sets up at the inslot that slides and with screw rod screw-thread fit's slider nut, the drive shaft of first motor extend to the inslot that slides and with the one end fixed connection of screw rod, the slider nut slides along the length direction in groove of sliding, the lower surface one end at the movable mould is fixed to the roof of slider nut.

Through the technical scheme, the screw rod is driven to rotate by the motor, and the sliding groove has a limiting effect on the movement of the sliding block nut, so that the sliding block nut slides along the length direction of the screw rod, the movable die is driven to be away from the fixed die, and an injection molded finished product is conveniently taken out; the sliding mode formed by the structure has the advantages of simple structure, convenience in taking out finished products and improvement of processing efficiency.

The utility model discloses further set up to: the base is located the open-ended opposite side and is equipped with the guide way along its length direction, the sliding is equipped with the guide block in the guide way, the roof of guide block is fixed at the movable mould and is kept away from the lower surface of slider nut one end.

Through above-mentioned technical scheme, the stability of movable mould in-process that slides has been improved to the cooperation of guide way and guide block.

The utility model discloses further set up to: the lifting assembly comprises two opposite cylinders arranged on the bottom wall of the second cavity of the base and a driving rod connected with a piston rod of each cylinder, the extending direction of the piston rod of each cylinder is the same as the height direction of the base, and one ends, far away from the cylinders, of the driving rods penetrate through the openings and are fixedly connected with the lower surfaces of the supporting blocks.

Through above-mentioned technical scheme, utilize the cylinder drive actuating lever to shift up, and then drive the supporting shoe and pass the opening and extend to the top of base, thereby make the upper surface of supporting shoe contradict at off-the-shelf lower surface, make the finished product take place displacement from top to bottom, make things convenient for the grip block to press from both sides the finished product tightly, finally realize taking out the finished product, adopt the lift mode that above-mentioned structure constitutes, moreover, the steam generator is simple in structure, convenient operation, make two grip blocks move up to off-the-shelf both ends fast, so that the finished product is held, and the.

The utility model discloses further set up to: the upper surface of the supporting block is provided with a sliding groove penetrating through the bottom wall of the supporting block along the length direction of the supporting block, the driving assembly comprises a second motor arranged on the end wall of the supporting block, a screw rod rotatably arranged in the sliding groove and two driving blocks which are oppositely arranged and are in a cross shape, a driving shaft of the second motor extends into the sliding groove to be fixedly connected with one end of the screw rod, the other end of the screw rod is rotatably connected with the groove wall of the sliding groove, two ends of the screw rod are arranged into reverse threads, the two driving blocks are respectively in threaded fit with two ends of the screw rod, the top walls of the two driving blocks are respectively fixedly connected with the lower surfaces of the two clamping plates, the sliding groove is provided with a supporting groove along the length direction of the sliding groove on two groove walls adjacent to the notch of the sliding groove.

According to the technical scheme, the screw rod is driven to rotate by the second motor, the two ends of the screw rod are provided with the directional threads, the sliding grooves limit the movement of the driving blocks, and the horizontal two ends of the two driving blocks are close to or far away from each other along the length direction of the supporting grooves, so that the two clamping plates are close to each other and attached to the side wall of a finished product, and the finished product is clamped finally; the driving mode that adopts above-mentioned structure to constitute, simple structure, convenient operation does not need the staff to take out the finished product manually, has saved the manpower, has improved machining efficiency.

The utility model discloses further set up to: the end wall of base is equipped with the discharge gate along its direction of height, base one side is located discharge gate department and is equipped with the containing box, the base is located the second cavity and inclines to ground and is equipped with down the flitch, the higher one end of lower flitch is fixed on the inner wall that the base is located the second cavity, the lower one end of flitch passes the discharge gate and extends to in the containing box down, the upper surface of flitch is equipped with the through-hole that supplies the piston rod of cylinder to stretch out down.

Through above-mentioned technical scheme, the setting of flitch down for the finished product drops on flitch down and because the action of gravity is landing to the containing box downwards, has finally realized taking out the finished product one by one to off-the-shelf collection, does not need the staff, has saved the manpower, has improved work efficiency.

The utility model discloses further set up to: and the upper surface of the lower material plate is provided with a cushion pad.

Through above-mentioned technical scheme, because the finished product drops and can take place to damage down on the flitch, the setting of blotter plays the effect of buffering protection to the finished product.

The utility model discloses further set up to: rubber pads are arranged on the opposite side walls of the two clamping plates.

Through above-mentioned technical scheme, the setting of rubber pad has strengthened the compactness of laminating between grip block and the finished product lateral wall, has improved the stability to the finished product centre gripping.

To sum up, the utility model discloses following beneficial effect has:

1. firstly, through a feed inlet, a machine body can inject a blank into a first cavity for cooling and forming; secondly, driving the movable mold to be far away from the fixed mold by using the sliding assembly; then, the lifting assembly is used for driving the supporting block to penetrate through the opening, and the upper surface of the supporting block abuts against the lower surface of the finished product; finally, the driving assembly is utilized to drive the two clamping plates to approach each other, so that the clamping plates are attached to the side walls of the finished product and can clamp the finished product; the lifting assembly is used for driving the supporting block to move downwards, so that the finished product moves downwards into the second cavity, the driving assembly is used for driving the two clamping plates to be away from each other, the finished product falls into the second cavity, and finally the collection of the product is realized; by adopting the demoulding device with the structure, workers do not need to manually take out the finished product after injection moulding, so that the finished product can be prevented from being adhered to the fixed mould, the labor is saved, and the processing efficiency is improved;

2. the screw rod is driven to rotate by the second motor, and because the two ends of the screw rod are provided with reverse threads and the sliding groove has a limiting effect on the movement of the driving blocks, the horizontal two ends of the two driving blocks are close to or far away from each other along the length direction of the supporting groove, so that the two clamping plates are close to each other and attached to the side wall of a finished product, and the finished product is clamped finally; the driving mode formed by the structure is simple in structure and convenient to operate, and a worker does not need to take out a finished product manually, so that the labor is saved, and the processing efficiency is improved;

3. the setting of flitch down for the finished product drops on flitch down and because the action of gravity downwards landing to the containing box in, finally realized taking out the finished product, need not the staff one by one, saved the manpower, improved work efficiency.

Drawings

Fig. 1 is a schematic view of the overall structure of the present embodiment.

Fig. 2 is a schematic structural view for embodying the glide assembly in the present embodiment.

Fig. 3 is a schematic structural diagram for embodying the positional relationship between the fixed mold and the movable mold in the present embodiment.

Fig. 4 is a schematic structural view for embodying the driving assembly in the present embodiment.

Reference numerals: 1. a body; 2. a base; 3. moving the mold; 4. fixing a mold; 5. a support block; 6. a clamping plate; 7. a first cavity; 8. a feed inlet; 9. a slipping component; 91. a first motor; 92. a screw; 93. a slider nut; 10. an opening; 11. a second cavity; 12. a lifting assembly; 121. a cylinder; 122. a drive rod; 13. a drive assembly; 131. a second motor; 132. a screw rod; 133. a drive block; 14. a sliding groove; 15. a guide groove; 16. a guide block; 17. a chute; 18. a support groove; 19. a discharge port; 20. a storage box; 21. a blanking plate; 22. a through hole; 23. a cushion pad; 24. and (7) a rubber pad.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example (b):

an auxiliary demoulding device of an injection molding machine, referring to fig. 1, comprises a machine body 1, wherein a rectangular base 2 is arranged on one side of the machine body 1, a movable mould 3 and a fixed mould 4 which are matched in a concave-convex mode are oppositely arranged on the base 2, and the fixed mould 4 is detachably arranged on the base 2; the cover half 4 can be dismantled and set up on base 2, conveniently changes the cover half 4 of different grade type to mould plastics different specification and dimension's product, application scope is wide.

Referring to fig. 3, a first cavity 7 for collecting blanks is formed between the fixed mold 4 and the opposite side wall of the movable mold 3, and a feed port 8 communicated with the first cavity 7 is formed in the side wall of the fixed mold 4 facing the machine body 1; through the feed inlet 8, the blank can be injected into the first cavity 7, and finally the cooling fixation of the product is realized.

Referring to fig. 2 and 4, a second cavity 11 is arranged in the base 2, a supporting block 5 is arranged in the second cavity 11, two opposite clamping plates 6 are arranged on the supporting block 5, an opening 10 for the supporting block 5 to extend out is arranged in the middle of the upper surface of the base 2, which is positioned on one side of the fixed die 4, along the length direction of the upper surface, the base 2 is provided with a sliding component 9 for driving the movable die 3 to move along the length direction of the upper surface, a lifting component 12 for driving the supporting block 5 to slide along the height direction of the base 2 is arranged in the second cavity 11, a driving component 13 for driving the two clamping plates 6 to approach or separate from each other along the length direction of the supporting block 5 is arranged on; after the injection molding of the product is finished, firstly, the movable mold 3 is driven to be away from the fixed mold 4 by the sliding assembly 9, and the product is adhered to the fixed mold 4 at the moment; secondly, driving the supporting block 5 to pass through the opening 10 and extend to the upper part of the base 2 by using the lifting component 12, wherein the top wall of the supporting block 5 is propped against the lower surface of the finished product; then, the driving assembly 13 is utilized to drive the two clamping plates 6 to mutually approach and cling to the side walls of the finished product, so that the finished product can be clamped; finally, the lifting assembly 12 is used for driving the supporting block 5 to move downwards, so that the finished product moves downwards into the second cavity 11, the two clamping plates 6 are separated from each other, and the finished product can fall into the second cavity 11; the demoulding device with the structure can prevent the finished product from being stuck on the fixed mould 4, replaces manpower to take out the finished product after processing, saves time and labor, and improves the processing efficiency.

Referring to fig. 2, a sliding groove 14 is formed in one side of the base 2, which is located at the opening 10, along the length direction of the base 2, the sliding assembly 9 includes a first motor 91, a screw 92 and a slider nut 93, the first motor 91 is arranged on the end wall of the base 2, the screw 92 is rotatably arranged in the sliding groove 14, the slider nut 93 is in threaded fit with the screw 92, a driving shaft of the first motor 91 extends into the sliding groove 14 and is fixedly connected with one end of the screw 92, the other end of the screw 92 is rotatably connected with the groove wall of the sliding groove 14, which is adjacent to the notch of the sliding groove, the slider nut 93 slides along the length direction of the sliding groove 14, and the upper surface of; after the injection molding of the product is finished, the first motor 91 is utilized to drive the screw 92 to rotate, and the sliding groove 14 has a limiting effect on the sliding block nut 93, so that the sliding block nut 93 slides along the length direction of the sliding groove 14, the movable die 3 is driven to slide along the length direction of the base 2, finally, the movable die 3 is far away from the fixed die 4, and the finished product after the processing is conveniently taken out; the sliding mode formed by the structure has the advantages of simple structure, convenience in operation, convenience in taking out finished products and improvement of processing efficiency.

Referring to fig. 2, a guide groove 15 is formed in the other side of the base 2, which is located at the opening 10, along the length direction of the base, a guide block 16 is arranged on the lower surface of one end of the movable mold 3, which is far away from the slider nut 93, and the guide block 16 slides along the length direction of the guide groove 15; the cooperation of guide block 16 and guide way 15 has improved the stability of movable mould 3 in-process that slides, plays the guide effect.

Referring to fig. 2 and 4, the lifting assembly 12 includes two cylinders 121 oppositely disposed on the bottom wall of the second cavity 11 of the base 2 and a driving rod 122 connected to the piston rods of the cylinders 121, the extending direction of the piston rods of the cylinders 121 is the same as the height direction of the base 2, and one ends of the two driving rods 122 far from the cylinders 121 pass through the openings 10 and are fixedly connected to the lower surface of the supporting block 5; utilize cylinder 121 drive actuating lever 122 to pass opening 10, and then drive supporting shoe 5 rebound to supporting shoe 5 supports at off-the-shelf lower surface, makes the finished product take place displacement from top to bottom, and the pinch-off plate of being convenient for presss from both sides the finished product tightly, and takes out it, adopts the lift mode that above-mentioned structure constitutes, simple structure, and convenient operation, can be quick shift up the pinch-off plate to off-the-shelf both sides, has improved machining efficiency.

Referring to fig. 4, the upper surface of the supporting block 5 is provided with a sliding slot 17 penetrating through the bottom wall thereof along the length direction thereof, the driving assembly 13 includes a second motor 131 arranged on the end wall of the supporting block 5, a screw rod 132 rotatably arranged in the sliding slot 17 and driving blocks 133 penetrating through the two ends of the screw rod 132, the driving blocks 133 are cross-shaped, the driving blocks 133 are in threaded fit with the screw rod 132, the two ends of the screw rod 132 are provided with directional threads, the upper surfaces of the two driving blocks 133 are respectively and fixedly connected with the lower surface of the clamping plate 6, two slot walls of the sliding slot 17 adjacent to the notch thereof are provided with supporting slots 18 along the length direction thereof, the supporting slots 18 are in the same direction as the length direction of the sliding slot 17, and the two ends of the horizontal ends of the; the second motor 131 is used for driving the screw rod 132 to rotate, and the sliding groove 17 has a limiting effect on the driving block 133, and two ends of the screw rod 132 are provided with reverse threads, so that two ends of the horizontal end of the driving block 133 are driven to mutually approach or mutually separate along the length direction of the supporting groove 18, and the opposite side walls of the two clamping plates 6 are tightly attached to two side walls of a finished product; the driving mode formed by the structure is simple in structure and convenient to operate, the finished product is clamped finally, the finished product is taken out by replacing manpower, time and labor are saved, and the processing efficiency is improved; meanwhile, the distance between the two clamping plates 6 can be adjusted to match with finished products with different sizes and specifications, and the application range is wide.

Referring to fig. 4, rubber pads 24 are arranged between the opposite side walls of the two clamping plates 6; the rubber pad 24 is arranged, so that the tightness of the fit between the clamping plate 6 and the side wall of the finished product is enhanced, and the stability of clamping the finished product is improved.

Referring to fig. 2, a discharge port 19 is formed in the end wall of the base 2 along the height direction of the end wall, a storage box 20 is arranged at the position, located at the discharge port 19, on one side of the base 2, a blanking plate 21 inclined toward the ground is arranged in the second cavity 11 of the base 2, the higher end of the blanking plate 21 is fixed to the inner wall of the second cavity 11 of the base 2, the lower end of the blanking plate 21 penetrates through the discharge port 19 and extends into the storage box 20, two through holes 22 are formed in the upper surface of the blanking plate 21, and the size of each through hole 22 is matched with the size of a piston; flitch 21 slope sets up down for the finished product that drops on flitch 21 slides to containing box 20 in owing to gravity, has finally realized the collection to the finished product, does not need the staff one by one to take out the finished product in the second cavity 11, has saved the manpower, has improved work efficiency.

Referring to fig. 2, a cushion pad 23 is disposed on the upper surface of the blanking plate 21, and the cushion pad 23 is made of rubber; the cushion pad 23 can prevent the finished product from dropping to the blanking plate 21 and being damaged, thereby playing a role in buffering protection.

The utility model discloses a theory of operation does: firstly, a first motor 91 is utilized to drive a screw 92 to rotate, and then a slider nut 93 is driven to slide along the length direction of a sliding groove 14, so that the movable mold 3 is driven to be far away from the fixed mold 4, and at the moment, a finished product is adhered to the fixed mold 4; secondly, the cylinder 121 is used for driving the driving rod 122 to move upwards, so as to drive the supporting block 5 to pass through the opening 10 and abut against the lower surface of the finished product; then, the second motor 131 is used for driving the two clamping plates 6 to approach each other, and then the rubber pads 24 are attached to the two side walls of the finished product, so that the finished product can be clamped tightly; finally, the supporting block 5 is driven by the cylinder 121 to move downwards into the second cavity 11, and the two clamping plates are driven by the second cylinder 121 to be away from each other, so that the finished product drops on the cushion pad 23, and finally the finished product slides downwards into the storage box 20.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. The utility model provides an auxiliary demoulding device of injection molding machine, includes organism (1), sets up base (2) in organism (1) one side, sets up unsmooth complex movable mould (3) and cover half (4) on base (2), its characterized in that: also comprises a supporting block (5) and two clamping plates (6) which are oppositely arranged on the supporting block (5), a first cavity (7) is formed between the opposite side walls of the fixed die (4) and the movable die (3), a feed inlet (8) communicated with the first cavity (7) is arranged on the side wall of the fixed die (4) facing the machine body (1), the base (2) is provided with a sliding component (9) for driving the movable mould (3) to move along the length direction, an opening (10) for the supporting block (5) to pass through is arranged on one side of the fixed die (4) on the upper surface of the base (2) along the length direction, a second cavity (11) for collecting finished products is reserved in the base (2), a lifting component (12) for driving the supporting block (5) to move along the height direction of the base (2) is arranged in the second cavity (11), and a driving component (13) for driving the two clamping plates (6) to approach or separate from each other is arranged on the supporting block (5).

2. The auxiliary ejector apparatus of an injection molding machine according to claim 1, wherein: base (2) are located one side of opening (10) and are equipped with groove (14) that slides along its length direction, subassembly (9) that slides including setting up first motor (91) on base (2) end wall, rotate screw rod (92) that set up in groove (14) that slides and with screw rod (92) screw-thread fit's slider nut (93), the drive shaft of first motor (91) extend to in groove (14) that slides and with the one end fixed connection of screw rod (92), slider nut (93) slide along the length direction in groove (14) that slides, the lower surface one end at movable mould (3) is fixed to the roof of slider nut (93).

3. The auxiliary ejector apparatus of an injection molding machine according to claim 2, wherein: the other side of the base (2) located at the opening (10) is provided with a guide groove (15) along the length direction of the base, a guide block (16) is arranged in the guide groove (15) in a sliding mode, and the top wall of the guide block (16) is fixed to the lower surface of one end, away from the sliding block nut (93), of the movable die (3).

4. The auxiliary ejector apparatus of an injection molding machine according to claim 1, wherein: the lifting assembly (12) comprises two opposite air cylinders (121) arranged on the inner bottom wall of the second cavity (11) of the base (2) and driving rods (122) connected with piston rods of the air cylinders (121), the extending directions of the piston rods of the air cylinders (121) are the same as the height direction of the base (2), and one ends, far away from the air cylinders (121), of the driving rods (122) penetrate through the openings (10) and are fixedly connected with the lower surfaces of the supporting blocks (5).

5. The auxiliary ejector apparatus of an injection molding machine according to claim 4, wherein: the upper surface of the supporting block (5) is provided with a sliding groove (17) penetrating through the bottom wall of the supporting block along the length direction of the supporting block, the driving component (13) comprises a second motor (131) arranged on the end wall of the supporting block (5), a screw rod (132) rotatably arranged in the sliding groove (17) and two opposite cross-shaped driving blocks (133), a driving shaft of the second motor (131) extends into the sliding groove (17) and is fixedly connected with one end of the screw rod (132), the other end of the screw rod (132) is rotatably connected with the groove wall of the sliding groove (17), two ends of the screw rod (132) are provided with reverse threads, the two driving blocks (133) are respectively in threaded fit with two ends of the screw rod (132), the top walls of the two driving blocks (133) are respectively fixedly connected with the lower surfaces of the two clamping plates (6), two groove walls of the sliding groove (17) adjacent to the notch of the sliding groove are provided with supporting grooves (18) along the length direction of, the two horizontal ends of the two driving blocks (133) slide in the supporting grooves (18).

6. The auxiliary ejector apparatus of an injection molding machine according to claim 5, wherein: the end wall of base (2) is equipped with discharge gate (19) along its direction of height, base (2) one side is located discharge gate (19) department and is equipped with containing box (20), base (2) are located second cavity (11) and are equipped with down flitch (21) to ground slope, the higher one end of flitch (21) is fixed on the inner wall that base (2) are located second cavity (11) down, the lower one end of flitch (21) is passed discharge gate (19) and is extended to containing box (20) down, the upper surface of flitch (21) is equipped with through-hole (22) that the piston rod that supplies cylinder (121) to stretch out down.

7. The auxiliary ejector apparatus of an injection molding machine according to claim 6, wherein: the upper surface of the blanking plate (21) is provided with a cushion pad (23).

8. The auxiliary ejector apparatus of an injection molding machine according to claim 5, wherein: rubber pads (24) are arranged on the opposite side walls of the two clamping plates (6).