JPH0813502B2 - Blow molding device and method of mounting / removing mold in the device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for easily installing or removing a blow cavity type.

[0002]

2. Description of the Related Art FIG. 10 shows a blow molding station in a conventional blow molding apparatus. According to this device, the rotary transfer plate 20 is attached to the upper base 200 fixed above.
2 are rotatably mounted, and two rows of lip molds 204 are arranged on the rotary conveyance plate 202 at a fixed pitch P, for example. By rotatably driving the rotary transport plate 202, transport to another station is possible. In the stretch blow molding station of this apparatus, a blow core mold (not shown) is inserted from above into the lip opening of the preform 220 held by the lip mold 204, and the blow cavity mold 208 is raised and then the closing drive is performed. By doing so, the mold is clamped. In the figure, two rows of blow cavity dies 208 are provided corresponding to the two rows of preforms 220, and each of them is composed of two split dies 208a and 208b. The blow cavity molds 208, 208 can be opened / closed by moving the split molds 208a, 208b of the blow cavity molds 208a, 208b in line symmetry by the hydraulic mold clamping devices 206, 206. The two mold clamping / mold opening devices 206 are fixed to a lift plate 212 that can be moved up and down by a hydraulic cylinder 210. Although not shown in FIG. 10, the lift plate 212 has a guide rod whose upper end is fixed to an upper base. It is supported so that it can be raised and lowered.

[0003]

In the conventional apparatus as shown in FIG. 10, there has been a problem that the work of attaching and detaching the blow cavity mold 208 is extremely complicated. That is, in order to replace the blow cavity mold 208, an operator must put himself / herself in a restricted space between the upper base 200 and the elevator 212 to work. Even more seriously, in order to install or remove the blow cavity mold 208, a substantial weight of the blow cavity mold 208 must be loaded into or unloaded from the mold clamping device 106 below the upper substrate 200. Is. The blow cavity mold 208 is considerably larger than the preform injection mold and is therefore heavy, and if the number of simultaneous moldings is increased, it cannot be carried by hand. Even if the conventional apparatus is used to carry the blow cavity mold 208 by using a crane or the like, it is impossible to carry the blow cavity mold 208 to the final position due to the existence of the upper base 200.

[0004] Since it is impossible to convey to the final loading position by a crane, conventionally, an iron plate is laid on the mold clamping device 206 and slid on the iron plate to carry the blow cavity mold 208 below the lip mold 204. , It was temporarily fixed to the lip type and suspended. After that, the mold clamping device 206 is raised to release the temporary fixing and the blow cavity mold 208 is attached to the mold clamping device 206. Thus, the upper base 20
There were many work items below 0, and the work was complicated and dangerous.

Therefore, it is an object of the present invention to provide a device and a mold mounting / removing method capable of easily mounting or dismounting a blow cavity mold.

[0006]

In the apparatus of the present invention, a bed and an upper base above the bed are arranged in parallel, and a preform supported on the upper substrate side and a blow cavity type supported on the bed side are provided. In a blow molding device that can be relatively moved up and down, a mold clamping device that fixes the blow cavity mold and drives it, and a mold clamping device that can be positioned so as to locally project from the upper surface of the bed. And a fixing block for removably fixing.

According to the method of the present invention, when the blow cavity mold is attached or detached in the blow molding apparatus,
Arranging a loading / unloading member on the bed from a position below the mold clamping device to a position on the bed end side; releasing the fastening between the fixing block and the mold clamping device; Loading / unloading along the loading / unloading member.

[0008]

According to the device of the present invention, the fixing block for fixing the mold clamping device can be positioned so as to project locally from the upper surface of the bed, which is a work between the bed and the upper base. , The mold clamping device and the fixed block can be easily attached and detached, and compared to the conventional one in which the mold clamping device and the blow cavity mold are attached and detached by inserting a hand in a recessed place, the upper base lower The work contents in will become simple. Moreover, in the case of the device of the present invention, since the fixing block can be locally projected from the upper surface of the bed, a space is ensured between the mold clamping device and the bed, and by performing the method of the present invention, the removal is eliminated. It is possible to carry in and out the entire mold clamping device, and to attach / remove the blow cavity mold at the carried out position with less space restriction.

According to the method of the present invention, the loading / unloading member is arranged in the space between the mold clamping device and the bed. Arrangement of the loading / unloading member can be done either by laying it every time the loading / unloading work is performed, by pulling out what is permanently installed in the mold clamping device, or by adding it to the permanently installed member, or any other method. May be Therefore, after releasing the fastening between the fixed block and the mold clamping device, the mold clamping device can be moved to the end side of the bed along the loading / unloading member, and the wide position of the work space is not restricted by the upper base. It becomes possible to perform the work of mounting or removing the mold.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a blow molding apparatus to which the present invention is applied will be specifically described below with reference to the drawings.

The blow molding apparatus according to the embodiment is, for example, a rotary molding apparatus as shown in FIG. 9, and has four stations of an injection molding station 10, a temperature control station 12, a blowing station 14, and an eject station 16 in one stage. Have. The present invention can also be applied to other types of one-stage devices or two-stage devices.

In this molding apparatus, an upper base 18 (not shown in FIG. 9, see FIG. 1) is fixed above a bed 20, and four fan-shaped rotary transfer plates 22 are rotatably supported below the upper base 18. are doing. The four rotary transport plates 22 are arranged so that they can be stopped at the four stations 10 to 16 respectively.
It is formed in a fan shape of °, and its lower surface will be described in detail later.
The holding plates 44, 44 of the rows are respectively supported.
Further, each rotary conveyance plate 22 is fixed to an annular gear 26 via a connecting shaft 24. This annular gear 26 meshes with a drive gear 30 fixed to the output shaft of the drive device 28, and by intermittent drive of the drive device 28, each rotary conveyance plate 22 is driven.
Can be moved intermittently every 90 °.

The three stations 12 to 16 other than the injection molding station 10 are provided with an inner edge receiving member 32 which rotatably supports the lower surfaces of the inner edges of the three rotary transport plates 22, and further three rotary transport plates 22. An outer edge receiving member 34 that rotatably supports the lower surface on the outer edge side is provided. On the other hand, in the injection molding station 10 having the injection device 42, the rotary transfer plate 22 is supported so as to be able to move up and down according to the mold clamping or mold opening operation, and the rotary transfer plate 22 can be rotated and moved up and down in the injection molding station 10. A movable die inner edge receiving member 36 and a movable die outer edge receiving member 38 are provided for supporting. Further, in the injection molding station 10, a movable tie bar 40 is provided at a position surrounding three sides of the rotary transport plate 22. In addition, this movable tie bar 4
For details of 0, refer to Japanese Patent Application No. 3-
No. 32354, and the mold clamping drive device and the like are described in Japanese Patent Application Laid-Open No. 63-116830, so the details thereof will be omitted.

Next, the details of the blow molding station 14 will be described with reference to FIG. The drawing on the left side of the center of FIG. 1 shows a state in which two rows of blow cavity molds 48, 48 provided corresponding to the two rows of holding plates 44, 44 are lowered, and the right side thereof is a blow cavity mold. Four
It shows a state in which 8, 48 are raised.

In the present embodiment, 2 for holding the lip mold 46
The retaining plates 44,44 of the row are the first ones shown in phantom in FIG.
P1 and the second pitch P2 shown by the solid line can be converted. And two rows of holding plates 44,
The row pitch of 44 is set to the first pitch P1 until the end of molding in the injection molding station 10, the temperature control station 12, and the blow molding station 14, and from the mold opening in the blow molding station 14 to the end of the ejection in the eject station 16. It is set to the second pitch P2 and reset to the first pitch P1 before returning to the injection molding station 10.

The two rows of blow cavity molds 48, 48 are
As shown in FIG. 2, each is composed of a first split mold 48a and a second split mold 48b, and in the present embodiment, the two first split molds 48a, 48a are fixed in a back-to-back alignment. The mold clamping / mold opening of the blow cavity molds 48, 48 is realized by driving only the two second mold halves 48b, 48b to open and close, and the driving is realized by driving the mold clamping device 50. .

As shown in FIGS. 2 and 3, the mold clamping device 50 has a bottom plate 52 that is driven up and down below the upper substrate 18 that rotatably supports the rotary transfer plate 22. An immovable fixing plate 54 for fixing the two first split molds 48a, 48a is fixed to the bottom plate 52. Movable first and second mold clamping plates 56 and 58 for fixing the two second split molds 48b and 48b, respectively, are arranged on both sides of the fixed plate 54. Further, a movable drive plate 60 is arranged outside the first mold clamping plate 56. And the drive plate 6
For example, four clamps, one end of which is fixed to 0 and the other end of which extends through the first mold clamping plate 56 and the fixing plate 54 are fixed to the second mold clamping plate 58 (only two are shown in the drawing) Shaft 6
2 are provided. The fixed plate 54 and the first mold clamping plate 5
6 is provided with escape holes 54a and 56a through which the shaft 62 is inserted, and in order to ensure that the first mold clamping plate 56 moves smoothly along the shaft 62, the first mold clamping plate 56 has a linear shape. The bearing 56b is fixed.

The mold clamping / mold opening drive is realized by an opening / closing drive mechanism 70 which variably drives the facing distance between the drive plate 60 and the first mold clamping plate 56. The opening / closing drive mechanism 70 includes a first arm 72, one end of which is rotatably supported by a first hinge 74 of the drive plate, and one end of which is a second hinge 78 provided on the first mold clamping plate 56. A second arm 76 rotatably supported, a rotation support shaft 80 that rotatably connects the other ends of the first and second arms 72, 76, and the rotation support shaft 80.
Is composed of a drive source, for example, an air cylinder 82, for driving to move up and down in a direction orthogonal to the clamp shaft 62, that is, in the vertical direction. Forward / backward rod 84 of cylinder 82
Is connected to the rotary support shaft 80.

With such a structure, when the advancing / retreating rod 84 extends upward as shown in FIG. 2, the intersection angle between the first and second arms 72 and 76 becomes small, and the drive plate 60 and the first arm 72 and 76 become smaller. The distance between the first and the first mold clamping plate 56 is narrowed. Therefore, the left split second mold 48b fixed to the first mold clamping plate 56 moves to the right side in the figure to the fixed left split mold 48a, and the right split The blow cavity mold 48 is opened. At the same time, the driving force of the fixing plate 54 in the right direction is applied to the second mold clamping fixing plate 5 via the clamp shaft 62.
8, the second split mold 48b in the right row moves rightward, and the mold opening of the blow cavity mold 48 in the right row is also realized.

The mold clamping operation is as shown in FIG. When the advancing / retreating rod 84 of the cylinder 82 descends, the first and second arms 72 and 76 are aligned, the first mold clamping plate 56 moves to the right, and the second mold clamping plate 58 moves to the left. The first and second split molds 48a of the blow cavity molds 48 in each row,
The parting surface of 48b comes into close contact. Moreover, since the first and second arms 72 and 76 are in a straight line, the mold clamping state can be firmly maintained.

According to such a mold clamping device 50, the drive source may be provided only on one side of the blow cavity mold 48,
Since the drive source is not required on the other side, the space is saved. In particular, in the case of the rotary transfer type as shown in FIG. 9, a space-saving configuration that does not require a drive source on the rotation center side can be realized, and the effect of being able to downsize the entire apparatus is great.

Further, as compared with the hydraulic system or the like as the drive source, the open / close drive mechanism has a structure capable of maintaining the mold clamping force when the first and second arms 72 and 76 are substantially aligned. Even if an air cylinder with low dynamic power is adopted, it has the effect of ensuring a predetermined mold clamping force.

Next, an elevating device for detachably fixing the bottom plate 52 of the mold clamping device 50 and for elevating and lowering the same will be described with reference to FIGS.

This elevating device is roughly classified into an elevating drive cylinder 90, a fixed block 110 on which the bottom plate 52 is placed and which is detachably fixed, and a driving force of the elevating drive cylinder 90 is transmitted to the fixed block 110. Power transmission mechanism 10
0.

First, the connection between the bottom plate 52 and the fixed block 110 will be described. Side plates 53, 53 (only one of which is shown in FIG. 1) are fixed to both bottom surfaces of the bottom plate 52 in the width direction. The side plate 53 includes a bottom plate 52.
Screw holes 53a are formed in the vertical direction at positions near the four corners. On the other hand, the fixing block 110 has a fixing plate 112 having a hole 112a at a position corresponding to the screw hole 53a of the side plate 53 and fixed by a bolt 113, as shown in FIG. Mounting surface 1 on which the lower end 53b of the side plate 53 is mounted
12b and a link connecting plate 114 formed to hang down from the mounting surface 112b, and a rod connecting portion 116 protruding outward from the side surface of the fixed plate 112. Further, positioning holes 52a penetrating from the upper surface to the lower surface are provided at the four corners of the bottom plate 52, and the pins 116 inserted into the positioning holes 52a are provided on the upper surface of the rod connecting portion 116.
a is provided. Then, by inserting the positioning hole 52a into the pin 116a, the positioning of both is realized.

The fixed block 110 is locally projected above the bed 20 and is attached to the four corners of the bottom plate 52, and the driving force of the lifting drive cylinder 90 is transmitted to the power transmission mechanism 1.
It is driven up and down by being transmitted via 00. As a result, the mold clamping device 50 and the blow cavity molds 48, 48 are moved up and down.

The ascending / descending drive cylinder 90 is supported below the bed 20 by a cylinder fixing plate 92 suspended and fixed by, for example, four support rods 94. The rod connecting portion 116 of the fixed block 110 fixes the upper end of the guide rod 118, and the lower end side of the guide rod 118 is guided and supported so as to be able to move up and down by a bearing 96 fixed to the cylinder fixing plate 92. . A connecting plate 98 for connecting the two left and right guide rods 118 is fixed to the lower end portion of the guide rod 118 projecting downward from the bearing 96 so that the plurality of guide rods 118 can be smoothly moved up and down. There is.

Next, the link mechanism 120 provided at four places, which is an example of the power transmission mechanism 100, will be described.

A first fulcrum shaft 124 is formed so as to project from the inner surface of the link connecting plate 114 in the fixed block 110, and one end of the first link 122 is rotatably supported by the first fulcrum shaft 124. (See also Figure 7).
On the other hand, a second fulcrum shaft 130 is formed on the cylinder fixing plate 92 suspended and fixed to the bed 20, and one end of the second link 126 is rotatably supported by the second fulcrum shaft 130. Then, the first and second links 122, 1
The other ends of 26 are rotatably connected by a third fulcrum shaft 132. In the vicinity of the third fulcrum shaft 130 of the second link 126, a protrusion 128 protruding in a direction forming an acute angle with the second link 126 is formed.
A fourth fulcrum shaft 134 is formed on the. On the other hand, an elevating block 140 is fixed to the tip of the advancing / retreating rod 90a of the elevating / lowering drive cylinder 90, and the elevating block 140 is fixed by a guide rod 142 fixed between the bed 20 and the cylinder fixing plate 92 along the vertical direction. It is guided and supported so that it can be raised and lowered. The lifting block 140 includes protrusion pieces 1 protruding toward the respective positions of the link mechanism 120 at four locations.
40a is fixed, and the projecting piece 140a and the fourth link 136 are rotatably connected via a fifth fulcrum shaft 138.

In the present embodiment, one air cylinder is used as the lifting drive cylinder 90, and the balancer 150 is arranged in order to reduce the load on the air cylinder having a relatively small driving power. The balancer 150 is provided at four locations corresponding to the four link mechanisms 120,
Each balancer 150 is connected to four link mechanisms 120 and four fixed blocks 110 are connected to the chain 15
It is connected through 4. A sprocket 152 is rotatably supported on the bed 20, and an intermediate position of the chain 150 is bridged over the sprocket 152, and one end 154a of the chain is fixed to the fixed block 110.
And the other end 154b is connected to the balancer 150. Further, a connecting plate 156 that connects two adjacent balancers 150 to each other is provided, and the balancer 150 moves up and down while keeping the right and left in harmony.

Next, the raising / lowering drive of the mold clamping device 50 will be described.

The left side portion of FIG. 1 shows a state in which the mold clamping device 50 is set to the lower limit position, and at this time, the advancing / retreating rod 90a of the lifting drive cylinder 90 is set to the retracted position. When the advancing / retreating rod 90a is set to the retracted position, the crossing angle of the first and second links 122 and 126 is relatively large, so that the fixed block 110 is fixed to the bed 20.
The mold clamping device 50 is stopped near the upper part and the mold clamping device 50 is set to the lowered position. At this time, the two rows of holding plates 44,
Even if the preform or bottle held by 44 is carried in or out by the rotational driving of the rotary carrier plate 22, the mold clamping device 50 and the blow cavity molds 48, 48 are set at the lower position so as not to interfere with them. . Further, when the mold clamping device 50 is set to the lower limit position, the fourth link 136 is designed so as to be oriented in a substantially vertical direction, so that it can withstand the pressure of blow air, and moreover, the mold clamping device. The weight of 50 and the blow cavity mold 48, 48 can be supported, and the load on the lifting drive cylinder 90, which is an air cylinder, can be reduced.

Next, when raising the mold clamping device 50, the advancing / retreating rod 90a of the raising / lowering drive cylinder 90 is raised. Then, the third fulcrum shaft 132 of the first and second links 122 and 126 is passed through the fourth link 136.
Is driven to rotate, and as shown on the right side of FIG. 1, the first and second links 122 and 126 are set to be substantially straight in the vertical direction. As a result, the fixed block 110 fixed to the upper end of the first link 122 is raised, and it becomes possible to set the blow cavity molds 48, 48 fixed to the mold clamping device 50 to positions where mold clamping is possible. During the ascending drive, the balancer 150 connected to the fixed block 110 via the chain 154 is driven down, so that the descending drive of the balancer 150 can be used as the ascending drive force of the mold clamping device 50, and is constituted by an air cylinder. The load on the lifting drive cylinder 90 can be reduced. Further, since the first and second links 122 and 126 are substantially straight in the vertical direction and the mold clamping state is maintained,
The first and second links 122 and 126 can maintain a predetermined mold clamping force as a kind of rigid body. This also makes it possible to significantly reduce the load on the lifting drive cylinder 90.

Next, a method of attaching / removing the blow cavity molds 48, 48 in the apparatus of this embodiment will be described with reference to FIG.

First, the case where two rows of blow cavity molds 48, 48 are fixed to the mold clamping device 50 and the molds are replaced with new molds will be described. In this embodiment, the mold clamping device 5
The whole 0 is carried out to the end side of the bed 20, and for this purpose, for example, a rail member 160 shown in FIG. 5 is used as a carrying-in / carrying-out member. This rail member 160
Is a fixed base 162 made of, for example, H-shaped steel, and the linear bearing 1 arranged on the horizontal plane of the fixed base 162.
64 and a movable base 166 which is horizontally movable on the linear bearing 164 and has, for example, a U-shaped cross section and whose upper end projects from the upper end of the fixed base 162. The linear bearing 164 includes a large number of balls 164a and a retainer 164b that rotatably holds the balls 164a so that the upper hemisphere side is exposed upward. First Step As shown in FIG. 6, the rail member 160 is attached to the mold clamping device 50.
The bed 20 is placed on the bed 20 in a length range extending from the lower position to the end side position of the bed 20. As a result, the movable table 16
6 can be horizontally conveyed between the lower position of the mold clamping device 50 and the end side position of the bed 20. At this time, in order to prevent the bottom plate 52 of the mold clamping device 50 from interfering with the movable table 166, the lifting / lowering drive cylinder 90 is used in advance.
Is stopped at the upper position. Second step The movable base 166 is mounted on the mold clamping device 50 along the rail member 160.
To the lower position, and then the lifting drive cylinder 90
Is driven to lower the mold clamping device 50. As a result, FIG.
As shown in FIG.
It will come into contact with the upper end of 6. Third step In the state shown in FIG. 7, the fastening of the four fixed blocks 110 is released. That is, the bolt 113 that fastens the fixing block 110 and the side plate 53 is removed. Further, the lifting drive cylinder 90 is driven to fix the four fixed blocks 1
Lower 10 As a result, the pin 116a can be removed from the hole 52a of the bottom plate 52, and the mold clamping device 50 and the fixed block 110 are completely free. Fourth Step Next, the movable table 166 equipped with the mold clamping device 50 is horizontally conveyed along the rail member 160, and the mold clamping / side opening device 50 is installed.
To the end of the bed 20. A state in which the mold clamping device 50 is carried out is shown in FIG. 8, and at this time, it is preferable that the mold clamping device 50 is set to a position displaced from the lower position of the upper base 18 to the end side of the bed 20. Fifth step With the mold clamping device 50 carried out to the end side of the bed 20,
The blow cavity molds 48, 48 are removed. Since this work does not have the upper base 18, there is no risk of contact with other members and the worker can safely perform this work. Then, the blow cavity molds 48, 48 that have been removed are mounted on the crane 17 as shown in FIG.
It will be separated from the mold clamping device 50 by using 0 or the like. When the mold is to be replaced with a new mold, the new mold is similarly suspended by the crane 170 and set in the mold clamping device 50. After that, the replacement of the mold is completed by performing the above-mentioned fifth to first steps in reverse order.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the gist of the present invention.

The purpose of the apparatus of the present invention is mainly to easily realize the attachment / detachment of the blow cavity type, and the fixing block 110 can detachably fix the mold clamping apparatus 50 above the bed 20. For example, various modifications can be made to the lifting drive mechanism of the fixed block 110. In the above embodiment, the link mechanism 1
By providing 20, the air cylinder can be used as the lifting / lowering drive cylinder 90, but this lifting / lowering drive may be realized by a hydraulic system as in the conventional case. Further, in the above embodiment, the present invention is applied to the device that changes the row pitch of the two rows of holding plates 44, 44,
The present invention can be similarly applied to the case where the row pitch is fixed or the case where the holding plate and the blow cavity mold are arranged in one row.

[0038]

As described above, according to the device of the present invention, the mold clamping device can be removed from the fixing block protruding from the bed upper surface, and the space between the mold clamping device and the bed can be clamped. It can be used as a laying area such as a rail for moving the device. According to the method of the present invention, by disposing the rails in the space, the entire mold clamping device can be carried out to the bed end side without restriction of the upper base. Therefore, according to the device of the present invention and the method of the present invention, the mold can be easily attached or detached.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of a blow molding station in an apparatus according to an embodiment of the present invention, in which a left side portion of the drawing shows a state in which a blow cavity mold is lowered, and a right side portion of the drawing shows a blow cavity mold in a raised state. It shows the state.

FIG. 2 is a schematic explanatory view showing an opening / closing drive device of a blow cavity type constituted by two split molds, showing a state in which the two split molds are driven to open.

FIG. 3 is a schematic explanatory diagram showing a state in which two split molds are driven to be closed in the opening / closing drive device of FIG. 2;

FIG. 4 is a schematic perspective view showing a connection structure between a fixed block and a mold clamping device.

FIG. 5 is a schematic perspective view showing an example of a rail member used for carrying out the method of the present invention.

FIG. 6 is a schematic explanatory diagram for explaining a first step in the method of the example.

FIG. 7 is a schematic explanatory diagram for explaining second and third steps in the method of the example.

FIG. 8 is a schematic explanatory diagram for explaining the fourth and fifth steps in the example method.

FIG. 9 is a schematic plan view for explaining the overall configuration of the device of the embodiment.

FIG. 10 is a schematic cross-sectional view of a conventional device.

[Explanation of symbols]

14 Blow molding station 18 Upper base 20 Bed 44 Holding plate 46 Lip type 48 Blow cavity type 48a First split mold 48b Second split mold 50 Mold clamping device 52 Bottom plate 53 Side plate 90 Lifting drive cylinder 90a Advance rod 110 Fixed Block 122 First link 124 First fulcrum shaft 126 Second link 130 Second fulcrum shaft 132 Third fulcrum shaft 140 Elevating block 150 Balancer 152 Sprocket 154 Chain 160 Rail member 162 Fixed base 164 Movable base 170 Crane
NS010001

Claims (7)

[Claims] 1. A preform in which a bed and an upper base above the bed are arranged in parallel, and which is supported on the side of the upper base,
In a blow molding device capable of moving up and down relative to a blow cavity mold supported on the bed side, a mold clamping device that fixes the blow cavity mold and drives the mold clamping, and locally from the top surface of the bed. A blow molding device comprising: a fixing block that can be positioned so as to project and that detachably fixes the mold clamping device. 2. The lifting drive source for lifting the fixed block according to claim 1,
A power transmission mechanism that transmits the power of the lifting drive source to the fixed block is provided, and the power transmission mechanism includes a guide member that guides the fixed block only in a vertical direction, and one end of the guide member with respect to the fixed block. A first link rotatably connected via a first support shaft, one end rotatably connected to the bed side via a second support shaft, and the other end other end of the first link A second link that is rotatably connected to the second link via a third support shaft, and the second link is positively moved around the third support shaft by the power of the lifting drive source. A blow molding device, wherein the mold clamping device is raised and lowered by rotating in the opposite direction. 3. The mold clamping device according to claim 2, wherein the mold clamping device has a rectangular bottom plate, the fixed blocks are respectively connected near four corners thereof, and the power transmission mechanism is arranged on each of the four fixed blocks. In addition, the blow molding apparatus is characterized in that four second links are rotationally driven by a single lifting drive source. 4. The height position during blow molding of the blow cavity mold according to claim 2 or 3, wherein the height position is set when the first and second links extend in a straight line in the vertical direction. Blow molding equipment. 5. The balancer according to claim 1, wherein a balancer that descends when the mold clamping device rises and that rises when the mold clamping device descends is connected to the fixed block via a traction member. Blow molding equipment characterized by. 6. The blow molding device according to claim 1, wherein when the blow cavity mold is attached or detached, the loading / unloading member is placed on the bed from a position below the mold clamping device to a position on the bed end side. And a step of releasing the fastening between the fixing block and the mold clamping device, and a step of loading or unloading the mold clamping device along the loading / unloading member. How to install / remove. 7. The blow molding apparatus according to any one of claims 1 to 5, wherein when the blow cavity mold is attached or detached, the above-mentioned bed is extended from a lower position of the mold clamping device to a bed end side position. A loading / unloading member, lowering the fixed block, placing the mold clamping device on the loading / unloading member, releasing the fastening between the fixing block and the mold clamping device, Is carried out to the bed end portion side along the carrying-in / carrying-out member, and the blow cavity mold is mounted or removed from the carried-out mold clamping device.