CN212266400U - Mould opening and closing mechanism - Google Patents

Abstract

The utility model provides a die opening and closing mechanism, includes a pair of upper pull rod, a pair of lower pull rod, a left sloping, a right sloping, establishes upper pull rod left end portion cohesion device corresponding to the position on left sloping upper portion, establishes lower pull rod left end portion cohesion device corresponding to the position on left sloping lower part, establishes upper pull rod right end portion cohesion device corresponding to the position on right sloping upper portion and establishes lower pull rod right end portion cohesion device corresponding to the position on right sloping lower part, characteristics: the left end and the right end of the pair of upper pull rods respectively form an upper pull rod limiting end disc, and the left end and the right end of the pair of lower pull rods respectively form a lower pull rod limiting end disc; the upper pull rod right end portion embracing-closing device comprises an upper bearing bush, a lower bearing bush fixing seat and a gland, the upper bearing bush and the lower bearing bush are oppositely embraced at the right ends of a pair of upper pull rods, the lower bearing bush fixing seat is fixed on the upper portion of the right oblique beam, the lower bearing bush is fixed with the lower bearing bush fixing seat, and the gland is sleeved on the upper pull rod limiting end disc. The mold opening and closing effect is ensured; has good cohesion effect with the pull rod.

Description

Mould opening and closing mechanism

Technical Field

The utility model belongs to the technical field of plastic products forming machine, concretely relates to mould mechanism opens and shuts.

Background

The above-mentioned plastic products include hollow plastic products such as various plastic containers, pallet buckets and trays (e.g., CN102407967B and CN102009774B, etc.), and non-hollow plastic products such as plastic rings, plastic caps, various types of plastic shells, etc.

As is known in the art, the plastic product molding machine performs a mold opening and closing operation once for each product to be molded, and for this purpose, the following patent documents are referred to, but not limited to: CN101890772B (mold opening and closing mechanism), CN101890850B (magnetic mold closing device of hollow plastic product molding machine), CN102357948A (toggle type mold opening and closing mechanism), CN102848558A (mold locking device of hollow plastic product molding machine), CN103522528B (horizontal mold closing mechanism for blow molding), CN103587109B (mold locking device of hollow plastic product molding machine), and CN103538244B (mold locking device structure of hollow plastic product molding machine), and the like.

Further, as known in the art, the larger the volume of the plastic product to be molded, the larger the cylinder stroke of the structural system of the mold opening and closing mechanism, and the two mold halves (referred to as "left and right mold halves" or "front and rear mold halves" in the art) that are fitted to each other face to face need to be locked by a sufficient locking force after they are fitted to each other, so as to ensure the quality of the plastic product, especially the hollow plastic product, otherwise there is a possibility of leaving a mold seam or flash on the plastic product, which is referred to as "fast mold opening and closing cylinder structure of plastic product molding machine" recommended by CN 105909591B.

It can be determined without doubt by reading the above-exemplified patent documents, in combination with conventional knowledge: the structure system of the mold opening and closing mechanism comprises a pair of upper pull rods and a pair of lower pull rods, a left oblique beam is movably arranged between the left ends of the pair of upper pull rods and the pair of lower pull rods, a right oblique beam is arranged between the right ends of the pair of upper pull rods and the pair of lower pull rods, a mold opening and closing acting cylinder (such as an oil cylinder of CN 105909591B) is arranged on the right oblique beam in a horizontal state, the bottom of the left oblique beam and a left oblique beam guide rail on a rack base form a guide rail pair, the right oblique beam and a right oblique beam guide rail on the rack base form a guide rail pair, a right mold frame is arranged on the left side corresponding to the right oblique beam, and the lower part of the right mold frame and a pair of right mold beam guide rails on the rack base form a guide rail pair. In a use state, a left half die is fixed on one side of the left die carrier facing the right die carrier, namely the right side of the left die carrier, and a right half die is fixed on one side of the right die carrier facing the left die carrier, namely the left side of the right die carrier. Since the closing process of the left and right mold halves can be seen in CN105909591B, the applicant does not need to describe any further details.

In the process of opening and closing the die, the pull rod nut which is positioned at the end parts of the two ends of the pull rod and used for limiting the oblique beam is greatly stressed, and theoretically or from the conventional design angle, the pull rod nut can meet the locking requirement on the end part of the pull rod. However, since the tie rod nut screwed on the external thread of the tie rod at the end of the tie rod in the prior art including the above-mentioned CN105909591B is a general female screw nut, it is difficult for the general tie rod nut to exert a permanent locking effect on the tie rod as a whole. Specifically, after the common draw-bar nut is screwed on the external thread of the draw-bar at the end of the draw-bar, the stress is concentrated, and the peak value of the local stress on the draw-bar is high, so that the thread of the draw-bar nut corresponding to the position is easily damaged, such as the thread breaking phenomenon, and the external thread of the draw-bar is damaged, if the thread is left out of the treatment, the mold opening and closing effect is affected, and the replacement of the broken thread of the draw-bar nut needs to be carried out in a halt state, so that the molding efficiency of the plastic product is affected; if the pull rod with damaged external threads needs to be replaced, on one hand, the cost of the equipment in the using process is increased, and on the other hand, the processing efficiency of the plastic products is further influenced due to the fact that the equipment is stopped for a relatively long time.

The "frame structure of plastic molding machine" recommended by CN110877429A is a reasonable improvement on the structure of the draw-bar nut, so that it is able to ensure that the matching part of the internal thread of the draw-bar nut and the external thread of the draw-bar is uniformly stressed without causing tooth breakage due to stress concentration. However, the aforementioned structure of the draw rod nut proposed by CN110877429A still has the following disadvantages: firstly, because the structural design concept cannot get rid of the constraint of adopting the nut, when a plastic product molding machine faces a large-size plastic product, the pull rod nut is difficult to avoid tooth breakage and cannot ensure the uniform stress effect of the matched part of the pull rod nut and the pull rod external thread, because under the working condition of large stress, once a relatively narrow pull rod nut expansion annular groove disappears, the internal thread of the pull rod nut corresponding to the expansion annular groove area of the pull rod nut cannot continuously keep the uniform stress effect with the external thread of the pull rod; secondly, because the pull rod nut is adopted, the structural design of the pull rod is correspondingly restricted, for example, the end part of the pull rod is required to ensure that the pull rod nut is screwed in and out (screwed out during replacement), so that the pull rod does not have the limiting or restricting effect on the tail end of the pull rod nut except the external thread on the pull rod for the matching of the pull rod nut; thirdly, if the nut structure is used, the problem of deterioration or even failure of the fixing and connecting effect with the pull rod cannot be solved. Due to the foregoing factors without limitation, it is necessary to make reasonable improvements, and the technical solutions described below are made in this context.

Disclosure of Invention

The task of the utility model is to provide a help utilizing pull rod tip cohesion device to replace the nut and can avoid influencing the injecing to the sloping and then influence the mould opening and shutting effect because of the screw thread damage, be favorable to making pull rod self participate in the spacing of pull rod tip cohesion device and can stop pull rod tip cohesion device and shake off from the pull rod, be of value to showing the whole area of contact between increase pull rod tip cohesion device and the pull rod and can effectively prevent the pull rod tip cohesion device and the mould opening and shutting mechanism that the slip situation appears in the pull rod tip.

The task of the utility model is to accomplish like this, a mold opening and closing mechanism, include a pair of upper tie rod that is parallel around each other at length direction, parallel around each other and a pair of lower tie rod corresponding to the below of a pair of upper tie rod at length direction, a left sloping that links between the left end of a pair of upper tie rod and a pair of lower tie rod, a right sloping that links between the right-hand member of a pair of upper tie rod and a pair of lower tie rod's right-hand member, set up respectively one upper tie rod left end portion cohesion device at the left end of a pair of upper tie rod in the position that corresponds to the upper portion of left sloping, set up respectively one lower tie rod left end portion cohesion device at the left end of a pair of lower tie rod in the position that corresponds to the lower portion of left sloping, set up respectively one upper tie rod right end portion cohesion device at the right-hand member of a pair of upper tie rod in the position that corresponds to the upper portion of right sloping and set up respectively one lower tie rod right end portion cohesion device at the right-hand member of a pair of lower The left end embracing device of the upper pull rod, the left end embracing device of the lower pull rod and the right end embracing device of the lower pull rod have the same structure as the right end embracing device of the upper pull rod, and the left end embracing device of the upper pull rod and the left end embracing device of the lower pull rod are respectively connected with the upper part and the lower part of the left oblique beam; the right end holding device of the upper pull rod comprises an upper bearing bush, a lower bearing bush fixing seat and a gland, wherein the upper bearing bush and the lower bearing bush correspond to the left side of the upper pull rod limiting end disc and are held at the right ends of the pair of upper pull rods in a face-to-face state, the lower bearing bush fixing seat is fixed at the upper part of the right oblique beam, the lower bearing bush is fixed with the lower bearing bush fixing seat, and the gland is sleeved on the upper pull rod limiting end disc and is fixed with the right end faces of the upper bearing bush and the lower bearing bush.

In a specific embodiment of the present invention, an upper bushing pull rod engaging cavity extending from the left end to the right end of the upper bushing is formed in the middle of one side of the upper bushing facing the lower bushing and along the length direction of the upper bushing, and a lower bushing pull rod engaging cavity extending from the left end to the right end of the lower bushing is formed in the middle of one side of the lower bushing facing the upper bushing and along the length direction of the lower bushing, and the upper bushing pull rod engaging cavity and the lower bushing pull rod engaging cavity are engaged with the right ends of the pair of upper pull rods in a face-to-face manner; one side of the gland facing the upper pull rod limiting end disc is provided with a gland end disc accommodating cavity, and the upper pull rod limiting end disc is accommodated in the gland end disc accommodating cavity.

In another specific embodiment of the present invention, an upper bearing shell screw hole is provided at a distance from each of the front side and the rear side of the upper bearing shell in the length direction, and an upper bearing shell screw is provided on the upper bearing shell screw hole; the front side and the rear side of the length direction of the lower bearing bush are respectively provided with a lower bearing bush screw hole at intervals, a lower bearing bush screw is arranged on the lower bearing bush screw hole in a matched mode, a fixing seat screw hole is formed in the lower bearing bush fixing seat and in a position corresponding to the lower bearing bush screw, the upper bearing bush screw is screwed into an upper bearing bush screw hole formed in the lower bearing bush, and the lower bearing bush screw is screwed into the fixing seat screw hole and further screwed to the top of the oblique beam.

In yet another specific embodiment of the present invention, an upper bearing bush gland screw hole is provided at a distance from the right end surface of the upper bearing bush, a lower bearing bush gland screw hole is provided at a distance from the right end surface of the lower bearing bush, and gland fixing screws are provided on the gland and at positions corresponding to the upper bearing bush gland screw hole and the lower bearing bush gland screw hole, and the gland fixing screws are fixed to the upper bearing bush gland screw hole and the lower bearing bush gland screw hole, respectively.

In another specific embodiment of the present invention, the upper bearing bush has an upper bearing bush key groove formed in the front middle portion and the rear middle portion of one side of the lower bearing bush, a lower bearing bush key groove formed in the front middle portion and the rear middle portion of one side of the upper bearing bush and corresponding to the upper bearing bush key groove, and a bearing bush fixing key disposed between the upper bearing bush key groove and the lower bearing bush key groove.

In yet another specific embodiment of the present invention, the upper bearing shell keyway and the lower bearing shell keyway have the same depth and width, and the thickness of the bearing shell fixing key is the sum of the depths of the upper bearing shell keyway and the lower bearing shell keyway, and the width and length of the bearing shell fixing key are the same as the width and length of the upper bearing shell keyway and the lower bearing shell keyway.

In a more specific embodiment of the present invention, the lower bearing shell is formed with a lower bearing shell additional key groove extending from the front side to the rear side of the lower bearing shell toward one side of the lower bearing shell fixing seat, the lower bearing shell additional key groove is located in the middle of the lower bearing shell, a lower bearing shell additional fixing seat key groove extending from the front side to the rear side of the lower bearing shell is formed in the lower bearing shell fixing seat toward one side of the lower bearing shell and at a position corresponding to the lower bearing shell additional key groove, and a lower bearing shell additional fixing key is placed between the lower bearing shell additional key groove and the lower bearing shell fixing seat key groove.

In yet another specific embodiment of the present invention, the lower bearing shell additional key groove and the lower bearing shell fixing seat key groove have the same depth and the same width and length, the thickness of the lower bearing shell additional fixing key is the sum of the depths of the lower bearing shell additional key groove and the lower bearing shell fixing seat key groove, and the width and the length of the lower bearing shell additional fixing key are the same as the width and the length of the lower bearing shell additional key groove and the lower bearing shell fixing seat key groove.

In a still more specific embodiment of the present invention, upper tie adjustment shims are respectively disposed at left and right ends of the pair of upper tie rods and in a state of being in contact with the upper tie limiting end discs; and lower pull rod adjusting gaskets are respectively arranged at the left end and the right end of the pair of lower pull rods and in a state of being attached to and contacted with the lower pull rod limiting end disc.

In yet another specific embodiment of the present invention, the lower drawbar shim has the same structure as the upper drawbar shim, and the upper drawbar shim is formed by fitting the first half-lobe i and the second half-lobe ii to each other, a first half-lobe step cavity i and a first half-lobe insert i are formed at both ends of the first half-lobe i, a second half-lobe step cavity ii and a second half-lobe insert ii are formed at both ends of the second half-lobe ii, the first half-lobe step cavity i is fitted with the second half-lobe insert ii, and the first half-lobe insert i is fitted with the second half-lobe step cavity ii.

One of the technical effects of the technical scheme provided by the utility model is that the left end and the right end of the pair of upper pull rods are respectively provided with the left end holding device of the upper pull rod and the right end holding device of the upper pull rod, and the left end and the right end of the pair of lower pull rods are respectively provided with the left end holding device and the right end holding device of the lower pull rod, so that the structural form of using nuts in the prior art is creatively abandoned, the limitation on the oblique beam caused by thread damage can be avoided, and the die opening and closing effect is ensured; secondly, the left end embracing device of the upper pull rod and the left end embracing device of the lower pull rod and the right end embracing device of the upper pull rod and the lower pull rod have good embracing effect with the pull rods, so that the situation that the pull rods are separated from the ends of the upper pull rod and the lower pull rod can not occur; thirdly, because the contact areas of the left end part embracing device of the upper pull rod and the left end part embracing device of the lower pull rod and the right end part embracing device of the upper pull rod and the right end part of the lower pull rod with the end parts of the pair of the upper pull rod and the lower pull rod are respectively increased, the sliding situation can not occur in the using process; fourthly, because the upper pull rod and the lower pull rod are respectively provided with the upper pull rod adjusting gasket and the lower pull rod adjusting gasket, the pair of the upper pull rod and the pair of the lower pull rod are ensured to be in a good working condition state.

Drawings

Fig. 1 is a schematic view of the mold opening and closing mechanism of the present invention.

Fig. 2 is a detailed structural view of the clasping device at the right end of the upper pull rod shown in fig. 1.

Fig. 3 is a schematic view of fig. 2 after assembly.

Detailed Description

In order to make the technical essence and advantages of the present invention more clear, the applicant below describes in detail the embodiments, but the description of the embodiments is not a limitation of the present invention, and any equivalent changes made according to the inventive concept, which are only formal and not essential, should be considered as the technical scope of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the position state of fig. 1, and thus, should not be interpreted as a specific limitation to the technical solution provided by the present invention.

Referring to fig. 1, there is shown a mold opening and closing mechanism comprising a pair of upper tie bars 1 arranged in parallel front and back to each other in a longitudinal direction, a pair of lower tie bars 2 arranged in parallel front and back to each other in a longitudinal direction and corresponding to a lower portion of the pair of upper tie bars 1, a left oblique beam 3 connected between left ends of the pair of upper tie bars 1 and left ends of the pair of lower tie bars 2, a right oblique beam 4 connected between right ends of the pair of upper tie bars 1 and right ends of the pair of lower tie bars 2, an upper tie bar left end clasping means 5a provided at left ends of the pair of upper tie bars 1 at a position corresponding to an upper portion of the left oblique beam 3, a lower tie bar left end clasping means 5b provided at left ends of the pair of lower tie bars 2 at a position corresponding to a lower portion of the left oblique beam 3, an upper tie bar right end clasping means 6 provided at right ends of the pair of upper tie bars 1 at a position corresponding to an upper portion of the right oblique beam 4, and an upper tie bar right end clasping means The structure of each of the right end of the pair of lower tie bars 2 is the same as that of the right end of the upper tie bar 5, and the left end of the upper tie bar 5a, the left end of the lower tie bar 5b and the right end of the lower tie bar 5c are the same as that of the right end of the upper tie bar 5, and the left end of the upper tie bar 5a and the left end of the lower tie bar 5b are connected to the upper part and the lower part of the left stringer 3, respectively, and the right end of the upper tie bar 6 and the right end of the lower tie bar 5c are connected to the upper part and the lower part of the right stringer 4, respectively.

Fig. 1 also shows a pair of frame bases 7 (also referred to as "frame bottom beams", hereinafter the same) which are parallel to each other in the longitudinal direction and are integrally supported and connected to each other by a connecting cross beam, and which also belong to the structural system of the mold opening and closing mechanism, and which are preferably directly supported on the floor in the use state, and fig. 1 also shows a left mold frame 8 and a right mold frame 9 which also belong to the structural system of the mold opening and closing mechanism, and the front and rear lower portions of the left mold frame 8 form a rail pair with a pair of left mold frame guide rails 71 provided on the upward side of the left end of the pair of frame bases 7, and the front and rear lower portions of the right mold frame 9 form a rail pair with a pair of right mold frame guide rails 72 provided in the vicinity of the middle portions of the pair of frame bases 7, and the left oblique beam 3 is fixedly connected to the left side of the. Since the left end embracing means 5a of the upper tie bar is fixedly connected with the upper part of the left oblique beam 3, and the left end embracing means 5b of the lower tie bar is fixedly connected with the lower part of the left oblique beam 3, in a use state, the left oblique beam 3 and the left formwork 8 are basically in a static state, i.e. in a non-sliding state, and in adjustment, for example, in the case of replacing the specifications, such as thickness, of the upper tie bar adjusting gasket 12 and the lower tie bar adjusting gasket 22, which will be mentioned below, reasonable positions on the pair of upper and lower tie bars 1, 2 of the left oblique beam 3 need to be reasonably changed, and the position of the left formwork 8 on the pair of left formwork guide rails 71 needs to be reasonably changed accordingly. Since the right end embracing means 6 of the upper tie bar is fixedly connected with the upper portion of the right oblique beam 4 and the right end embracing means 5c of the lower tie bar is fixedly connected with the lower portion of the right oblique beam 4, the right oblique beam 4 is basically in a static state, i.e. in a non-sliding state, in a use state, and a reasonable position of the right oblique beam 4 on the pair of upper and lower tie bars 1 and 2 needs to be reasonably changed when adjusting, for example, changing the specifications such as thickness of the upper tie bar adjusting shim 12 and the lower tie bar adjusting shim 22 mentioned above. In fig. 1, there is shown a case where a lower portion of the front and rear sides of the right oblique beam 4 and a pair of right oblique beam guide rails 74 provided on a side where the right ends of the pair of frame bases 7 face upward constitute a guide rail pair, and there is also shown a right mold frame actuating cylinder 41 provided on the right oblique beam 4 in a lying state, the right mold frame actuating cylinder 41 being an oil cylinder and a cylinder column 411 thereof facing leftward, the cylinder column 411 being connected (hinge-connected) to the right side of the right mold frame 9, and the right mold frame 9 being displaceable in a direction (i.e., leftward) relative to the aforementioned left mold frame 8 or in a direction (i.e., rightward) away from the left mold frame 8 with the aid of a pair of synchronizing devices 73 shown in fig. 1 and provided on the aforementioned pair of frame bases 7 at positions corresponding to each other, under the action of the cylinder column 411. In an actual use state, a left half die and a right half die are respectively arranged on the opposite sides of the left die frame 8 and the right die frame 9, so that the left half die and the right half die can be closed when the right die frame 9 moves leftwards, and vice versa. Since the present disclosure belongs to the prior art, for example, refer to the patent documents mentioned by the applicant in the above background art column, although a brief explanation, it will not confuse the understanding of those skilled in the art.

Please refer to fig. 2 in combination with fig. 1, which is a technical point of the technical solution provided by the present invention: an upper pull rod limiting end disc 11 with a diameter larger than that of the pair of upper pull rods 1 is respectively formed at the left end part and the right end part of the pair of upper pull rods 1, and a lower pull rod limiting end disc 21 with a diameter larger than that of the pair of lower pull rods 2 is respectively formed at the left end part and the right end part of the pair of lower pull rods 2; the right end engaging device 6 of the upper tie rod comprises an upper bush 61, a lower bush 62, a lower bush fixing seat 63 and a gland 64, wherein the upper bush 61 and the lower bush 62 correspond to the left side of the upper tie rod limiting end disc 11 and engage with the right ends of the pair of upper tie rods 1 in a mutually facing state, the lower bush fixing seat 63 is fixed on the upper portion of the right oblique beam 4, the lower bush 62 is fixed with the lower bush fixing seat 63, and the gland 64 is sleeved on the upper tie rod limiting end disc 11 and fixed with the right end faces of the upper bush 61 and the lower bush 62.

An upper bushing pull rod matching cavity 611 extending from the left end to the right end of the upper bushing 61 is formed in the middle of one side of the upper bushing 61 facing the lower bushing 62 and along the length direction of the upper bushing 61, a lower bushing pull rod matching cavity 621 extending from the left end to the right end of the lower bushing 62 is formed in the middle of one side of the lower bushing 62 facing the upper bushing 61 and along the length direction of the lower bushing 62, the upper bushing pull rod matching cavity 611 and the lower bushing pull rod matching cavity 621 are clasped at the right ends of the pair of upper pull rods 1 in a face-to-face state, and as shown in fig. 2, the cross-sectional shapes of the upper bushing pull rod matching cavity 611 and the lower bushing pull rod matching cavity 621 are both C-shaped; a gland end disc accommodating cavity 641 is formed on one side of the gland 64 facing the upper pull rod limiting end disc 11, and the upper pull rod limiting end disc 11 is accommodated in the gland end disc accommodating cavity 641.

An upper bushing screw hole 612 is provided at a distance from each of the front side and the rear side of the upper bushing 61 in the longitudinal direction, and an upper bushing screw 6121 is provided in the upper bushing screw hole 612; a lower bushing screw hole 622 is provided at a distance from each of the front and rear sides of the lower bushing 62 in the longitudinal direction, a lower bushing screw 6221 is provided in the lower bushing screw hole 622, a fixing hole 631 is provided in the lower bushing fixing base 63 at a position corresponding to the lower bushing screw 6221, an upper bushing screw 6121 is screwed into an upper bushing screw hole 623 provided in the lower bushing 62, and the lower bushing screw 6221 is screwed into the fixing hole 631 and further screwed into the top of the oblique beam 4.

An upper bushing gland screw hole 613 is provided at a right end surface of the upper bushing 61 at a distance, a lower bushing gland screw hole 624 is provided at a right end surface of the lower bushing 62 at a distance, and gland fixing screws 642 are provided at positions corresponding to the upper bushing gland screw hole 613 and the lower bushing gland screw hole 624 in the gland 64, and the gland fixing screws 642 are fixed to the upper bushing gland screw hole 613 and the lower bushing gland screw hole 624, respectively.

Preferably, an upper bushing key groove 614 is formed in each of a front middle portion and a rear middle portion of a side of the upper bushing 61 facing the lower bushing 62 (i.e., a side facing downward), a lower bushing key groove 625 is formed in each of a front middle portion and a rear middle portion of a side of the lower bushing 62 facing the upper bushing 61 (i.e., a side facing upward) and at a position corresponding to the upper bushing key groove 614, and a bushing fixing key 65 is interposed between the upper bushing key groove 614 and the lower bushing key groove 625.

In this embodiment, the upper bearing key groove 614 and the lower bearing key groove 625 have the same depth and the same width and length, the thickness of the bearing fixing key 65 is the sum of the depths of the upper bearing key groove 614 and the lower bearing key groove 625, and the width and length of the bearing fixing key 65 are the same as the widths and lengths of the upper bearing key groove 614 and the lower bearing key groove 625.

Preferably, a lower bush additional key groove 626 penetrating from the front side to the rear side of the lower bush 62 is formed on the side of the lower bush 62 facing the lower bush fixing seat 63, i.e., on the side facing downward, the lower bush additional key groove 626 being located at the middle of the lower bush 62, a lower bush fixing seat key groove 632 extending from the front side to the rear side of the lower bush fixing seat 63 is formed on the side of the lower bush fixing seat 63 facing upward, i.e., on the side facing upward, corresponding to the lower bush additional key groove 626, and a lower bush additional fixing key 66 is interposed between the lower bush additional key groove 626 and the lower bush fixing seat key groove 632.

In this embodiment, the lower shoe additional key groove 626 and the lower shoe fixing seat key groove 632 have the same depth and the same width and length, the thickness of the lower shoe additional fixing key 66 is the sum of the depths of the lower shoe additional key groove 626 and the lower shoe fixing seat key groove 632, and the width and the length of the lower shoe additional fixing key 66 are the same as the widths and the lengths of the lower shoe additional key groove 626 and the lower shoe fixing seat key groove 632.

The above-mentioned upper tie rod adjusting shim 12 is preferably arranged at each of the left and right ends of the pair of upper tie rods 1 and in a state of being in contact with the inward side of the upper tie rod limiting end disc 11; the above-mentioned lower tie bar adjusting shims 22 are provided at the left and right ends of the pair of lower tie bars 2 and in a state of being in contact with the inward side of the lower tie bar stopper end plate 21.

Since the lower tie shim 22 has the same structure as the upper tie shim 12, the applicant only describes the upper tie shim 12 in detail, and the upper tie shim 12 is formed by fitting the first half-round piece i 121 and the second half-round piece ii 122 to each other, a first half-round piece step cavity i 1211 and a first half-round piece insert i 1212 are formed at both ends of the first half-round piece i 121, and a second half-round piece step cavity ii 1221 and a second half-round piece ii 1222 are formed at both ends of the second half-round piece ii 122, the first half-round piece step cavity i 1211 is fitted to the second half-round piece insert ii 1222, and the first half-round piece insert 1212 i is fitted to the second half-round piece step cavity ii 1221.

The thicknesses of the upper pull rod adjusting shim 12 and the lower pull rod adjusting shim 22 can be selected according to needs, and since the lengths of the pair of upper pull rods 1 and the pair of lower pull rods 2 are relatively long, undesirable deflection may occur, and therefore, the levelness of the pair of upper and lower pull rods 1 and 2 can be ensured by reasonably selecting shims with corresponding specifications. During actual assembly, the upper pull rod adjusting shim 12 is selected and arranged on the upper pull rod 1, and then the gland 64 is fixed with the end faces of the upper and lower bearing bushes 61 and 62. The same example of the lower link adjustment pad 22 will not be described again.

Referring to fig. 3, fig. 3 shows a situation after the right end clasping device 6 of the upper tie bar is fixed to the upper portion, i.e. the top, of the right sloping beam 4, when the right sloping beam 4 is subjected to the acting force of the right formwork actuating cylinder 41 shown in fig. 1, the right end clasping device 6 of the upper tie bar cannot break loose from the right ends of the pair of upper tie bars 1, and the stability of the right sloping beam 4 is fully ensured. In a word, because the left end part embracing devices 5a and 5b of the upper and lower pull rods and the right end part embracing devices 6 and 5c of the upper and lower pull rods are adopted, the pair of upper and lower pull rods 1 and 2 are not influenced by the torque force driven by the end surfaces any more in the mould opening and closing process of a plastic product forming machine such as a blow molding machine, and the service life can be prolonged to the utmost extent. The opening and closing of the right mold half on the right mold frame 9 and the left mold half on the left mold frame 8 belong to the known technology, for example, refer to the patent documents mentioned in the above background art column by the applicant, and thus the applicant is not described in detail.

To sum up, the technical solution provided by the present invention remedies the defects in the prior art, successfully completes the invention task, and faithfully embodies the technical effects mentioned in the above technical effect column by the applicant.

Claims (10)

1. A mold opening and closing mechanism comprises a pair of upper pull rods (1) which are parallel to each other in the longitudinal direction, a pair of lower pull rods (2) which are parallel to each other in the longitudinal direction and correspond to the lower portions of the pair of upper pull rods (1), a left oblique beam (3) which is connected between the left ends of the pair of upper pull rods (1) and the left ends of the pair of lower pull rods (2), a right oblique beam (4) which is connected between the right ends of the pair of upper pull rods (1) and the right ends of the pair of lower pull rods (2), an upper pull rod left end embracing means (5a) which is arranged at the left end of the pair of upper pull rods (1) at a position corresponding to the upper portion of the left oblique beam (3), a lower pull rod left end embracing means (5b) which is arranged at the left end of the pair of lower pull rods (2) at a position corresponding to the lower portion of the left oblique beam (3), and an upper pull rod right end embracing means which is arranged at the right end of the pair of upper pull rods (1) at a position corresponding (6) And a lower pull rod right end embracing device (5c) which is arranged at the right end of the pair of lower pull rods (2) at the position corresponding to the lower part of the right oblique beam (4), the structures of the upper pull rod left end embracing device (5a), the lower pull rod left end embracing device (5b) and the lower pull rod right end embracing device (5c) are the same as the upper pull rod right end embracing device (6), the upper pull rod left end embracing device (5a) and the lower pull rod left end embracing device (5b) are respectively connected with the upper part and the lower part of the left oblique beam (3), the upper pull rod right end embracing device (6) and the lower pull rod right end embracing device (5c) are respectively connected with the upper part and the lower part of the right oblique beam (4), the upper pull rod limiting end disc (11) with the diameter larger than the diameter of the pair of the upper pull rods (1) is respectively formed at the left end and the right end of the pair of the upper pull rods (1), the left end part and the right end part of the pair of lower pull rods (2) are respectively provided with a lower pull rod limiting end disc (21) with the diameter larger than that of the pair of lower pull rods (2); the right end embracing and combining device (6) of the upper pull rod comprises an upper bearing bush (61), a lower bearing bush (62), a lower bearing bush fixing seat (63) and a gland (64), wherein the upper bearing bush (61) and the lower bearing bush (62) correspond to the left side of the upper pull rod limiting end disc (11) and are embracing combined at the right ends of the pair of upper pull rods (1) in a mutually facing state, the lower bearing bush fixing seat (63) is fixed on the upper portion of the right oblique beam (4), the lower bearing bush (62) is fixed with the lower bearing bush fixing seat (63), and the gland (64) is sleeved on the upper pull rod limiting end disc (11) and is fixed with the right end faces of the upper bearing bush (61) and the lower bearing bush (62).

2. The die opening and closing mechanism according to claim 1, wherein an upper bushing tie rod engaging cavity (611) extending from a left end to a right end of the upper bushing (61) is formed in a middle portion of a side of the upper bushing (61) facing the lower bushing (62) and along a length direction of the upper bushing (61), and a lower bushing tie rod engaging cavity (621) extending from a left end to a right end of the lower bushing (62) is formed in a middle portion of a side of the lower bushing (62) facing the upper bushing (61) and along a length direction of the lower bushing (62), the upper bushing tie rod engaging cavity (611) and the lower bushing tie rod engaging cavity (621) being engaged with right ends of the pair of upper tie rods (1) in a state of facing each other; and a gland end disc accommodating cavity (641) is formed on one side of the gland (64) facing the upper pull rod limiting end disc (11), and the upper pull rod limiting end disc (11) is accommodated in the gland end disc accommodating cavity (641).

3. The mold opening and closing mechanism according to claim 1 or 2, wherein an upper bushing screw hole (612) is provided at a distance from each of the front side and the rear side of the upper bushing (61) in the longitudinal direction, and an upper bushing screw (6121) is provided in the upper bushing screw hole (612); the front side and the rear side of the length direction of the lower bearing bush (62) are respectively provided with a lower bearing bush screw hole (622) at intervals, a lower bearing bush screw (6221) is arranged on the lower bearing bush screw hole (622), a fixing seat screw hole (631) is formed in the lower bearing bush fixing seat (63) and in a position corresponding to the lower bearing bush screw (6221), the upper bearing bush screw (6121) is screwed into an upper bearing bush screw hole (623) formed in the lower bearing bush (62), and the lower bearing bush screw (6221) is screwed into the fixing seat screw hole (631) and further screwed to the top of the inclined beam (4).

4. The mold opening and closing mechanism according to claim 1 or 2, wherein an upper bearing bush gland screw hole (613) is provided at a right end surface of the upper bearing bush (61) at a distance, a lower bearing bush gland screw hole (624) is provided at a right end surface of the lower bearing bush (62) at a distance, and gland fixing screws (642) are provided on the gland (64) at positions corresponding to the upper bearing bush gland screw hole (613) and the lower bearing bush gland screw hole (624), the gland fixing screws (642) being fixed to the upper bearing bush gland screw hole (613) and the lower bearing bush gland screw hole (624), respectively.

5. The mold opening and closing mechanism according to claim 1 or 2, wherein an upper bushing key groove (614) is formed in each of a front middle portion and a rear middle portion of a side of the upper bushing (61) facing the lower bushing (62), a lower bushing key groove (625) is formed in each of a front middle portion and a rear middle portion of a side of the lower bushing (62) facing the upper bushing (61) and in a position corresponding to the upper bushing key groove (614), and a bushing fixing key (65) is interposed between the upper bushing key groove (614) and the lower bushing key groove (625).

6. The die opening and closing mechanism according to claim 5, wherein the upper bushing key groove (614) and the lower bushing key groove (625) have the same depth and the same width and length as each other, the thickness of the bushing fixing key (65) is the sum of the depths of the upper bushing key groove (614) and the lower bushing key groove (625), and the width and the length of the bushing fixing key (65) are the same as the widths and the lengths of the upper bushing key groove (614) and the lower bushing key groove (625).

7. The mold opening and closing mechanism according to claim 1 or 2, wherein a lower bearing additional key groove (626) penetrating from the front side to the rear side of the lower bearing (62) is formed in a side of the lower bearing (62) facing the lower bearing holder (63), the lower bearing additional key groove (626) is located in the middle of the lower bearing (62), a lower bearing holder key groove (632) extending from the front side to the rear side of the lower bearing holder (63) is formed in a side of the lower bearing holder (63) facing the lower bearing (62) and in a position corresponding to the lower bearing additional key groove (626), and a lower bearing additional fixing key (66) is interposed between the lower bearing additional key groove (626) and the lower bearing holder key groove (632).

8. The die opening and closing mechanism according to claim 7, wherein the lower bearing shell additional key groove (626) and the lower bearing shell fixing seat key groove (632) have the same depth and the same width and length, the thickness of the lower bearing shell additional fixing key (66) is the sum of the depths of the lower bearing shell additional key groove (626) and the lower bearing shell fixing seat key groove (632), and the width and the length of the lower bearing shell additional fixing key (66) are the same as the widths and the lengths of the lower bearing shell additional key groove (626) and the lower bearing shell fixing seat key groove (632).

9. The mold opening and closing mechanism according to claim 1 or 2, characterized in that upper tie adjusting shims (12) are respectively provided at the left and right ends of the pair of upper ties (1) and in a state of being in close contact with the upper tie limiting end discs (11); and lower pull rod adjusting gaskets (22) are respectively arranged at the left end and the right end of the pair of lower pull rods (2) and in a state of being attached to the lower pull rod limiting end disc (21).

10. The mold opening and closing mechanism according to claim 9, wherein the lower tie rod spacer (22) has the same structure as the upper tie rod spacer (12), and the upper tie rod spacer (12) is formed by a first semicircular lobe i (121) and a second semicircular lobe ii (122) which are engaged with each other, a first semicircular lobe step cavity i (1211) and a first semicircular lobe insert i (1212) are formed at both ends of the first semicircular lobe i (121), a second semicircular lobe step cavity ii (1221) and a second semicircular lobe insert ii (1222) are formed at both ends of the second semicircular lobe ii (122), the first semicircular lobe step cavity i (1211) is engaged with the second semicircular lobe insert ii (1222), and the first semicircular lobe insert i (1212) is engaged with the second semicircular lobe step cavity ii (1221).

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