CN114986753A - Mould clamping device - Google Patents

Abstract

A die clamping device comprises a machine body, a first die holder, a second die holder and a third die holder which are vertically corresponding to each other are respectively arranged in the machine body and are used for respectively bearing a lower die, a middle die and an upper die set of a die, the upper die set comprises a first upper die and a second upper die, the second upper die is combined on the third die holder, the die clamping device controls the motion of the third die holder by a stroke control part so as to drive the second upper die to perform linear reciprocating motion of a first stroke between a reciprocating end point and a first reciprocating end point and perform linear reciprocating motion of a second stroke between the reciprocating end point and a second reciprocating end point, and the second upper die is overlapped on the lower die and separated from the upper die when positioned at the second reciprocating end point, so that a die hole space in the second upper die is communicated with a die cavity space of the lower die, the volume of the die chamber space is increased, so that the manufacturing operation that the volume of the raw material is larger than the volume of the die cavity space of the lower die is facilitated.

Description

Die clamping device

Technical Field

The present invention relates to polymer molding technology, and more particularly to a mold clamping device.

Background

The technical contents of mold clamping and opening of polymer molding processing mold by a mold clamping device are common techniques known in the technical field of polymer molding processing, but because the mold for molding processing by using polymer as raw material has different mold opening and closing strokes and mold clamping flows along with different molded articles, the technical contents of the conventional mold clamping are not good enough for the equal change.

Disclosure of Invention

The present invention is directed to a mold clamping device, which can provide different mold opening and closing strokes for molding different articles, and flexibly provide different mold opening and closing actions for a mold according to the variation of the actual manufacturing process, so as to meet the industrial requirements.

To achieve the above object, the present invention provides a mold clamping device, which comprises a body, a first mold base, a second mold base and a third mold base, which are vertically corresponding to each other, respectively disposed in the body, for respectively carrying a lower mold, a middle mold and an upper mold unit of a mold, wherein the upper mold unit further comprises a first upper mold and a second upper mold, and only the second upper mold is combined with the third mold base, and further the mold clamping device controls the movement of the third mold base by a stroke control portion, so as to drive the second upper mold to perform a linear reciprocating movement of a first stroke between a reciprocating stroke end point and a first reciprocating stroke end point, and perform a linear reciprocating movement of a second stroke between the reciprocating stroke end point and a second reciprocating stroke end point, and to make the second upper mold overlap the lower mold and separate from the upper mold when the second upper mold is located at the second reciprocating stroke end point, the die hole space in the second upper die can be communicated with the die cavity space of the lower die, and the volume of a die chamber space formed when the lower die and the second upper die are overlapped is increased, so that the manufacturing operation that the volume of raw materials is larger than the volume of the die cavity space of the lower die is facilitated.

The machine body is provided with a bottom, a top is positioned above the bottom and is separated from the bottom, a plurality of straight columnar first conductors are separated from each other and are respectively and vertically bridged between the bottom and the top, and the second die holder and the first die holder are respectively arranged on the first conductors in an up-and-down sliding manner so as to perform lifting reciprocating linear motion.

The top has a first top seat and a second top seat separated from each other, the first top seat is between the second top seat and the third mold seat, and a plurality of columnar second conductors are fixed on the second top seat at one end and fixed with the third mold seat at the other end respectively penetrating through the first top seat, so that the third mold seat is connected with the first top seat in a sliding way through each conductor.

The stroke control part is provided with a through hole penetrating the second top seat, a limiting rod is coaxially fixed on the first top seat through one end of the limiting rod in the through hole, a blocking piece is movably arranged on the second top seat and can move between a blocking position and a releasing position, when the blocking piece is positioned on the blocking position, the through hole is closed, so that the other end of the limiting rod is blocked from being inserted into the through hole, the third die seat can carry out reciprocating motion of the second stroke, and when the blocking piece is positioned on the releasing position, the through hole is opened, so that the other end of the limiting rod can be inserted into and penetrate through the through hole, and the third die seat can carry out reciprocating motion of the first stroke.

Wherein, the top further comprises two pier seats which are separately and fixedly arranged on the top ends of the first conductors respectively, and the first top seat is rotatably arranged among the pier seats.

The top part further comprises a rotating shaft which is bridged between the pier seats, and the first top seat is arranged between the pier seats and rotates by taking the rotating shaft as an axis.

Wherein, the blocking piece is pivoted on the second top seat.

The first upper die is attached to a combination surface of the first top seat opposite to the second top seat; the upper die set further comprises a plurality of clamping holes which respectively extend from the combining surface to the inside of the first top seat vertically, and each clamping hole is sequentially divided into a small-aperture section, a large-aperture section and a first shoulder surface between the small-aperture section and the large-aperture section along the extending direction from the combining surface; the upper die set further comprises a plurality of columnar clamping bodies, one end of each clamping body is vertically and fixedly connected to the first upper die, the other end of each clamping body is inserted into the corresponding clamping hole, and the outer diameter of the other end of each clamping body is larger than the inner diameter of the small-hole-diameter section of the corresponding clamping hole.

The upper module further comprises a plurality of jacks which are communicated with the clamping holes in pairs in the radial direction, extend from the combining surface to the inside of the second top seat respectively, and the aperture of each jack is larger than the outer diameter of the other end of each clamping body.

Each of the clamping bodies is sequentially divided into a combining section, a small outer diameter section, a large outer diameter section and a second shoulder surface between the large outer diameter section and the small outer diameter section from one end to the other end of the clamping body, and the second shoulder surface of each clamping body is oppositely abutted against the first shoulder surface of each clamping hole.

Wherein, the combining section is a bolt for being screwed on the first upper die.

The invention has the advantages that:

the mold clamping device provided by the invention can provide different mold opening and closing strokes of a mold when different articles are molded, and can flexibly provide different mold opening and closing actions for the mold according to the change of an actual manufacturing process so as to meet the industrial requirements.

Drawings

Fig. 1 is a perspective view of a preferred embodiment of the present invention, wherein the third mold base is located at the first stroke end point, and shows that the second upper mold is far away from the first upper mold and is rotated to a horizontal state.

Fig. 2 is a perspective view of a preferred embodiment of the present invention, wherein the third mold base is located at the end of the process, showing the state that the second upper mold and the first upper mold are overlapped.

Fig. 3 is a perspective view of a preferred embodiment of the present invention, wherein the third mold base is located at the second stroke end point, showing a state where the second upper mold is far from the first upper mold and is overlapped with the lower mold.

FIG. 4 is a perspective view of a portion of the components of a preferred embodiment of the present invention.

Fig. 5 to 16 are schematic plan views illustrating a molding process performed by the mold clamping device in the first mode according to a preferred embodiment of the present invention.

Fig. 17 is a schematic plan view of the mold clamping device in the second mode, showing the third mold base at the end of the second stroke.

Fig. 18 is an exploded view of the first upper mold and the first top seat in accordance with a preferred embodiment of the present invention.

Fig. 19 is a partially enlarged view of fig. 18.

Detailed Description

Referring to fig. 1 to 3, a mold clamping device 10 according to a preferred embodiment of the present invention mainly includes a body 20, a first mold base 30, a second mold base 40, a third mold base 50, a multi-layer mold 60, and a stroke control unit 70, wherein:

the body 20 has a bottom 21, a top 22 above the bottom 21 at a proper height, two pairs of first cylindrical conductors 23 vertically fixed between the bottom 21 and the top 22 at a distance from each other to support the top 22 at a proper height, and an open working space is formed between the bottom 21, the top 22 and each of the first conductors 23;

further, the bottom 21 has a fluid pressure cylinder 211 using fluid pressure as a power source, the output shaft is capable of extending and retracting in the working space in the axial direction toward the top 22, and two block-shaped side bodies 212 are protruded on two opposite sides of the top end of the fluid pressure cylinder 211;

each first conductor 23 is fixed on each side body 212 by the bottom end of the column shaft;

the top 22 has two pier seats 221 respectively fixed on the top ends of the column shafts of each pair of first conductors 23 and spaced apart from each other, a rotating shaft 222 is bridged between the pier seats 221 and makes the axial direction of the rotating shaft 222 perpendicular to the column shafts of each pair of first conductors 23, a first top seat 223 is arranged on the rotating shaft 222 between the pier seats 221 so as to rotate between an inclined position and a horizontal position by taking the rotating shaft 222 as the shaft, a second top seat 224 is positioned above the first top seat 223, two pairs of columnar second conductors 225 are respectively fixed on the second top seat 224 by the top ends of the column shafts, and the bottom ends of the column shafts penetrate through the first top seat 223 and extend out of the lower side of the first top seat 223 so as to be connected with the third mold seat 50, so that the third mold seat 50 is slidably arranged on the first top seat 223 by each second conductor 225.

The first die holder 30 is slidably disposed between the first conductors 23 in a plate shape, is located above the bottom 21, and is driven by the output shaft of the fluid pressure cylinder 211 to be reciprocally displaced up and down along the column axis direction of the first conductors 23.

The second mold base 40 has a pair of parallel long block-shaped guide rails 41 bridging between the first conductors 23 in the pair and between the first mold base 30 and the third mold base 50, and a sliding frame 42 slidably disposed between the guide rails 41 and guided by the guide rails 41 to move horizontally inside and outside the working space.

The third mold base 50 has two first frame strips 51, which are parallel to each other and are respectively fixed on the bottom ends of the column shafts of the second conductors 225 in pairs, and can perform reciprocating motion along the column shafts of the second conductors 225 in a linear direction relative to the first top base 223, and the two second frame strips 52 are respectively pivoted on one end of each first frame strip 51 by using one end thereof as a rotating shaft to rotate.

The multi-layer mold 60 is a conventional four-part shoe sole mold, and includes a lower mold 61, an intermediate mold 62, and an upper mold set composed of a first upper mold 63 and a second upper mold 64, so as to form mold chamber spaces for molding an article between the lower mold 61 and the intermediate mold 62, between the upper mold set and the intermediate mold 62, and between the first upper mold 63 and the second upper mold 64, respectively, except that the specific mold technical contents are not the technical features of the present invention, and are not intended to be redundantly shown, but it should be described that the lower mold 61 is fixed to the first mold base 30, the intermediate mold 62 is fixed to the second mold base 40, the first upper mold 63 is fixed to the joint surface on the lower side of the first top base 223, and the second upper mold 64 is arranged between the second frame strips 52.

Referring to fig. 4, the stroke control portion 70 is used for controlling the displacement stroke of the third die holder 50, so as to change the position of the second upper die 64 disposed on the third die holder 50, and further, in response to different processing mode requirements, the stroke control portion 70 has two through holes 71 respectively penetrating through the second top seat 224, two limiting rods 72 of equal length are disposed between the first top seat 223 and the second top seat 224, and are respectively fixed on the first top seat 223 by one end of a rod shaft, and the rod shafts are respectively coaxial with the corresponding hole shafts of the through holes 71, a long blocking member 73 is pivoted on the lower seat surface of the first top seat 223 by a middle section thereof and is rotatable between a blocking position and a releasing position, when the blocking member is located at the blocking position, two ends of the blocking member 73 respectively close the through holes 71 and are disposed between the limiting rods 72 and the through holes 71, the other end of the shaft of each of the position-limiting rods 72 is inserted into each of the through holes 71, and when the position-limiting rods are located at the releasing position, the two ends of the blocking member 73 respectively release each of the through holes 71, so that the other end of the shaft of each of the position-limiting rods 72 can be respectively inserted into the corresponding through hole 71 and can pass through each of the through holes 71 and then extend above the first top seat 223;

therefore, the stroke control portion 70 can make the third die holder 50 perform a first stroke reciprocating displacement or a second stroke reciprocating displacement by changing the position of the stop member 73, specifically, when the stop member 73 is located at the release position, the third die holder 50 can perform the first stroke reciprocating displacement between a stroke end point and a first stroke end point, wherein when the third die holder 50 is located at the stroke end point, the third die holder 50 is abutted against the lower side of the first top holder 223, so that the second upper die 64 and the first upper die 63 are overlapped with each other, and when the third die holder 50 is located at the first stroke end point, the third die holder 50 is far away from the first top holder 223 by a plurality of distances, so that the second upper die 65 is simultaneously separated from the first upper die 64, the middle die 62 and the lower die 61, and simultaneously, because the distance between the stroke end point and the first stroke end point exceeds the allowable movement range, therefore, before the third mold seat 50 moves to the first forward end, the first top seat 223 needs to rotate around the rotating shaft 222, so that the first forward end is located outside the working space, as shown in fig. 1 and 2;

when the stopping member 73 is located at the stopping position, the third die holder 50 can perform the reciprocating displacement of the second stroke between the reciprocating end point and a second reciprocating end point, and when the third die holder 50 is located at the second reciprocating end point, the other end of each limiting rod 72 abuts against the stopping member 73, and simultaneously the second upper die 64 is overlapped on the lower die 61 away from the first upper die 63 in the working space, as shown in fig. 3.

Through the above components, the mold clamping device 10 is suitable for the industry to perform the molding process in different modes according to the requirements of different molded products, for example, a sole, when the product is made of different raw materials, the product can be manufactured in a first mode, which is:

A1. preparation program

As shown in fig. 5, the first top seat 223 is rotated to the inclined position, the third mold seat 50 is moved to the first end point of the forward stroke, and the second frame strips 52 are rotated to the horizontal state and are separated from the first frame strips 51 by an acute angle, so that the first upper mold 63 disposed on the first top seat 223 and the second upper mold 64 disposed between the second frame strips 52 are separated from each other and are located at a position convenient for the operator to clean.

A2. Rotate back to the second upper mold

As shown in fig. 6, the second frame strips 52 are rotated to positions adjacent to the first frame strips in parallel by a fluid pressure cylinder, so that the second upper mold 64 is rotated to a state parallel to the first upper mold 63.

A3. Retracting upper module

As shown in fig. 7, the third die holder 50 is retracted by the fluid cylinder member, so that the second upper die is combined with the first upper die in an abutting manner, and a mold chamber space in a shape of a circular wall is formed therebetween.

A4. Pushing out the lower die and filling

As shown in fig. 7, the first mold base 30 is pushed out of the working space by a fluid pressure cylinder, so that an operator can fill the first material into an open mold cavity fixed on the lower mold 61.

A5. The first top part is rotated and retracted to the lower die

As shown in fig. 8, the top part 22 is rotated by external power, so that the upper mold set is driven to rotate from the inclined state of step a1 to a horizontal state parallel to the lower mold 61.

A6. Push-out middle die

As shown in fig. 9, 10, 9-1 and 10-1, the middle mold 62 at a standby position behind the workspace is lifted by power and then moved forward through the workspace to the front of the workspace.

A7. Filler material

As shown in fig. 10, a second material is filled by an operator into an open cavity in the upper side of the middle mold 62.

A8. Withdrawing middle die

As shown in fig. 11, the middle mold 62 is retracted into the working space with power, the upper side is parallel to the upper mold set, the lower side is parallel to the lower mold 61, and the middle mold 62 is lowered to be overlapped on the lower mold 61.

A9. First die assembly forming

As shown in fig. 12, the fluid pressure cylinder 211 at the bottom is used as a power to push the first mold base 30 upward to move toward the top 22, and then the lower mold 61 drives the middle mold 62 upward to abut against the upper mold set, so as to complete mold assembly, so that the second raw material and the first raw material are respectively molded into a second parison and a first parison between the upper mold set and the middle mold 62, and between the middle mold 62 and the lower mold 61.

A10. First opening the mould

As shown in fig. 13, the output shaft of the fluid pressure cylinder 211 is retracted to separate the middle mold 62 and the lower mold 61 from the upper mold set, and at the same time, the first parison formed in step I1 is left in the cavity of the lower mold 61, and the second parison is left on the first upper mold 63 and the second upper mold 64, and the annular wall is molded from the annular wall-shaped mold chamber space.

A11. Withdrawing middle mould

As shown in fig. 14 and 15, the middle mold 62 is moved upward away from the lower mold 61, moved out of the working space, and lowered to the standby position.

A12. Second time of die assembly forming

As shown in fig. 16, the first mold base 30 is lifted upward again by the fluid pressure cylinder 211 of the bottom 21, so that the lower mold 61 is overlapped under the upper mold set, thereby forming a finished mold chamber in the shape of a product, and the first blank and the second blank are combined with each other in the finished mold chamber and molded into the shape of the finished product.

A13. Second opening of the mould

As shown in fig. 5, after the lower mold 61 is separated from the upper mold set by using the fluid pressure cylinder 211 of the bottom 21 as a power source, the mold clamping device 10 may be further operated to the same preparation state as that of step a1 in order to facilitate the operator to take out the finished product and clean it.

When the product is molded into a sole article by using only the upper mold set and the lower mold element in the mold at one time, all the raw materials required for molding cannot be properly held in place due to the limited cavity space of the lower mold, and the product can be manufactured by the second mode as follows:

B1. preparation program

As shown in fig. 5, it is the same as the a1 step in the first mode described above.

B2. Rotate back to the second upper mold

As shown in fig. 6, it is the same as the a2 step in the first mode described above.

B3. Retracting upper module

As shown in fig. 7, it is the same as the a3 step in the first mode described above.

B4. Pushing out the lower die and filling

As shown in fig. 7, it is the same as the a4 step in the first mode described above.

B5. The first top part is rotated and retracted to the lower die

As shown in fig. 8, it is the same as the a5 step in the first mode described above.

B6. Moving the third mold seat to the second stroke end

As shown in fig. 17, the third mold seat 50 is driven by power to move to the second end of the forward stroke, so that the second upper mold 64 is overlapped on the lower mold 61, and the shoe-hole-shaped mold hole wall of the second upper mold 64 surrounds the corresponding mold cavity periphery of the lower mold 61, thereby increasing the volume of the space capable of containing the raw material, so that the whole raw material filled in step B4 can be maintained in a specific space for molding.

B7. Matched die forming

As shown in fig. 16, the lower mold 61 and the second upper mold 65, which are overlapped with each other, are moved upward by the power of the fluid pressure cylinder 211 at the bottom, and the lower mold 61 and the upper mold set are overlapped with each other and clamped to perform molding.

B8. Opening the mould to take out the finished product and cleaning

As shown in fig. 5, the mold clamping device is activated to the ready state as shown in step B1, so that the operator can take out the finished product and clean the mold, so that the next molding process can be performed smoothly.

As described above, the mold clamping device 10 can properly change the operating state thereof according to the process requirements of different products, so that different processes can be completed by the mold clamping device, thereby effectively reducing the cost of plant setup, providing flexibility of product line change, and having higher competitive advantage.

In addition, in order to facilitate the replacement of the mold, particularly the combination and separation technique between the first upper mold 63 and the first top seat 223, the present invention further discloses a quick release structure as described below.

Referring to fig. 18 and 19, the upper mold assembly has a plurality of engaging holes 65 vertically recessed from the engaging surface to the first top seat 223, and each engaging surface has an opening, a plurality of cylindrical engaging bodies 66 are vertically fixed to the first upper mold 63 by one end of the shaft, and the other end of the shaft is engaged with the engaging hole 65, and a plurality of insertion holes 67 are vertically recessed from the engaging surface to the first top seat 223, and each insertion hole 67 and each engaging hole 65 are paired and radially adjacent to each other, so that each engaging body 66 can move between the engaged engaging hole 65 and the adjacent insertion hole 67.

Each of the card holes 65 is sequentially partitioned from the open end to the inside into a small-aperture section 651, a large-aperture section 652 and a first shoulder face 653 between the large-aperture section 652 and the small-aperture section 651;

each of the locking bodies 66 is sequentially partitioned into a combining section 661, a small outer diameter section 662, a large outer diameter section 663 and a second shoulder surface 664 between the large outer diameter section 663 and the small outer diameter section 662 from one end of the column shaft to the other end, the outer diameter value of the large outer diameter section 663 is between the inner diameter value of the small outer diameter section 651 and the inner diameter value of the large outer diameter section 652, and the outer diameter value of the small outer diameter section 662 is smaller than the inner diameter value of the small outer diameter section 651;

each of the insertion holes 67 is a straight hole having a single diameter, and has an inner diameter larger than an outer diameter of the large outer diameter section 663.

Therefore, after each of the clamping bodies 66 is screwed to the first upper mold 63 through the coupling section 661, the first upper mold 63 can be moved to the adjacent and communicated clamping holes 65 along the radial direction of each of the insertion holes 67 by inserting each of the clamping bodies 66 into each of the insertion holes 67, so that the large outer diameter section 663 of each of the clamping bodies 66 is located in each of the large outer diameter sections 652, each of the second shoulder surfaces 664 abuts against each of the first shoulder surfaces 653, and the first upper mold 63 is fixed on the first top seat 223, and when the first upper mold 63 is to be separated from the first top seat 223, the first upper mold 63 can be detached from the first top seat 223 only by reverse operation, thereby achieving the effect of quick detachment and assembly.

The above description is of the preferred embodiment of the present invention and the technical principles applied thereto, and it will be apparent to those skilled in the art that any changes and modifications based on the equivalent changes and simple substitutions of the technical solutions of the present invention are within the protection scope of the present invention without departing from the spirit and scope of the present invention.

Claims (10)

1. A mold clamping device capable of molding in different modes, comprising:

the body is provided with a bottom, a top part is positioned above the bottom and is separated from the bottom, and a plurality of first conductors in a straight column shape are respectively arranged between the bottom and the top in a vertical bridge manner at intervals;

the first die holder is arranged on each first conductor in a sliding manner and is arranged between the bottom and the top;

the second die holder is arranged on each first conductor in a sliding mode and is arranged between the first die holder and the top;

the third die holder is arranged on the top in a sliding manner and can reciprocate along a linear direction;

a stroke control part for controlling the third die holder to perform a first stroke reciprocating motion or a second stroke reciprocating motion, when the third die holder performs the first stroke reciprocating motion, the third die holder performs reciprocating displacement between a reciprocating end point and a first stroke end point position, and when the third die holder performs the second stroke reciprocating motion, the third die holder performs reciprocating displacement between the reciprocating end point and a second stroke end point, and the second stroke end point is different from the first stroke end point;

the lower die is arranged on the first die holder;

the middle die is arranged on the second die holder;

the upper module is provided with a first upper die arranged on the top and a second upper die arranged on the third die holder;

when the third die holder is positioned at the return end point, the second upper die is connected with the first upper die in an abutting mode, when the third die holder is positioned at the second forward end point, the second upper die is connected with the first upper die in an abutting mode in a separated mode and the lower die in an abutting mode, and when the third die holder is positioned at the first forward end point, the second upper die is simultaneously separated from the first upper die, the middle die and the lower die.

2. The mold clamping device according to claim 1, wherein the top has a first top seat and a second top seat spaced apart from each other, the first top seat is disposed between the second top seat and the third mold seat, and a plurality of second conductors having a cylindrical shape are fixed at one end to the second top seat and fixed at the other end to the third mold seat through the first top seat, respectively, such that the third mold seat is slidably connected to the first top seat through the conductors.

3. The mold clamping device according to claim 2, wherein the stroke control portion has a through hole penetrating the second top base, a limiting rod is fixed to the first top base at one end thereof coaxially with the through hole, a stopper is movably disposed on the second top base and is capable of moving between a stopping position and a releasing position, the stopper closes the through hole when in the stopping position to prevent the other end of the limiting rod from being inserted into the through hole, so that the third base can perform the reciprocating movement of the second stroke, and the stopper opens the through hole when in the releasing position to allow the other end of the limiting rod to be inserted into the through hole, so that the third base can perform the reciprocating movement of the first stroke.

4. The mold clamping apparatus according to claim 2 or 3, wherein the top portion further comprises two abutments which are separately fixed to the top ends of the first conductors and are spaced apart from each other, and the first abutments are rotatably fixed between the abutments.

5. The mold clamping device according to claim 4, wherein the top portion further comprises a shaft bridging between the pier seats, and the first top seat is disposed between the pier seats and rotates around the shaft.

6. The mold clamping device according to claim 3, wherein the stopper is pivotally mounted on the second top seat.

7. The mold clamping device according to claim 2, wherein the first upper mold is attached to a surface of the first top base opposite to the second top base;

the upper module further comprises a plurality of clamping holes which vertically extend from the joint surface to the interior of the first top seat respectively, and each clamping hole is sequentially partitioned into a small-aperture section, a large-aperture section and a first shoulder surface between the small-aperture section and the large-aperture section along the extending direction from the joint surface;

the upper mold assembly further includes a plurality of columnar clamping bodies, one end of each clamping body is vertically and fixedly connected to the first upper mold, the other end of each clamping body is inserted into the corresponding clamping hole, and the outer diameter of the other end of each clamping body is larger than the inner diameter of the small-hole section of the corresponding clamping hole.

8. A die clamping device according to claim 7, wherein said upper die set further comprises a plurality of insertion holes, each of said insertion holes and each of said engaging holes are paired and radially communicated with each other, and extend from said engaging surface to the inside of said second top seat, respectively, such that the diameter of each of said insertion holes is larger than the outer diameter of the other end of each of said engaging bodies.

9. The mold clamping device according to claim 7 or 8, wherein each of the clamping bodies is divided into a combining section, a small outer diameter section, a large outer diameter section and a second shoulder surface between the large outer diameter section and the small outer diameter section sequentially from one end to the other end thereof, and the second shoulder surface of each of the clamping bodies is abutted against the first shoulder surface of each of the clamping holes.

10. The mold clamping device according to claim 9, wherein the coupling portion is a bolt for being screwed to the first upper mold.

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