JP3150647B2 - Vertical mold clamping devices such as injection molding machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical clamping device suitable for use in an injection molding machine of a vertical clamping horizontal injection system.

[0002]

2. Description of the Related Art A typical conventional vertical clamping device of a vertical clamping horizontal injection type injection molding machine has a top plate 42 fixed above a fixed plate 41 as shown in FIGS. The movable platen 44 is attached to the tie bars 43 so as to be vertically movable, and the movable platen 44 is lowered by a pair of small-diameter, high-speed mold opening / closing cylinders 45 (only one is shown in FIG. 10). The movable platen 44 is pressed down by a mold clamping cylinder (or a mold clamping ram, hereinafter, mold clamping cylinder) 46 having a large diameter to clamp the mold with the fixed platen 41.

A mold opening / closing cylinder 45 is provided at one diagonal position between the top board 42 and the movable board 44, and a mold clamping cylinder 46 is provided at a central portion between the top board 42 and the movable board 44. Have been. A pair of fixed cylinders 47, a hydraulic oil tank 48 and a pre-fill valve 4 are provided on the roof 42.
9 are provided. The fixed cylinder 47 is
The lock plate 52 is inserted into the insertion hole 51a of the stopper rod 51 provided in the above, and the movable platen 44 is fixed in the mold open state. The hydraulic oil tank 48 is connected to the mold clamping cylinder 46 via a pre-feed valve 49.

In addition to the above, a lower mounting plate and an upper mounting plate are mounted on a plurality of tie bars fixed to a base so as to be movable up and down. Lower the mounting plate, fix it to the tie bar with the clamp mechanism, press the lower plate upward with the large-diameter, high-pressure clamping cylinder provided on the base, and clamp the mold between both mounting plates. A mold clamping device is known (Japanese Utility Model Laid-Open No. 4-3351).
No. 5).

Further, a movable plate is fixed to an upper end of a plurality of tie bars provided on the fixed plate so as to be movable up and down, and the movable plate is lowered by a small-diameter high-speed mold opening / closing cylinder connected to a lower end of each tie bar. There is also known a vertical mold clamping device in which a tie bar is fixed to a fixed plate with a clamp mechanism, and then the upper mold is pressed down against the movable plate with a mold clamping cylinder provided on the movable plate to clamp the mold. (JP-A-63-104770).

[0006]

Each of the vertical clamping devices constructed as described above has the following problems. (A vertical mold clamping device in FIGS. 9 to 12) (A) The total height of the device is determined by the length of the tie bar 43, and the total height is reduced in addition to reducing the specification value such as reducing the mold opening stroke. Can not. For this reason,
When the height of the machine carry-in port is low, the apparatus has to be once brought down sideways and carried in, which takes time and troubles in assembling, and the assembling accuracy may be impaired at the time of carry-in.

(B) When opening and closing the mold by the mold clamping cylinder 46, a large amount of hydraulic oil must be supplied to the large mold clamping cylinder 46 (when the mold is closed) and discharged from the mold clamping cylinder 46 (when the mold is opened). As a result, the hydraulic oil tank 48 and the prefill valve 49 become large, and the overall height of the apparatus is further increased.

(C) For example, a die size is 800 mm ×
Large and heavy mold exceeding 2000mm (2000k
g), and a large vertical clamping device having a clamping force exceeding 400 tf, due to a difference in resistance between the four tie bars 43 in the vertical movement of the movable platen 44, etc. At the time of high-speed mold opening and closing operation, there is a case where a gouging force is generated at the attachment portion between the piston rod of the mold opening / closing cylinder 45 and the movable platen 44, and there is a concern that the attachment portion may be damaged.

(D) In addition to the fixed platen 41 and the movable platen 44, the top plate 42 is indispensable.
And a large capacity hydraulic oil tank 48 and a pre-feel valve 49 are required, which increases the manufacturing cost.

(E) Since no consideration is given to mold replacement, it takes time and effort to replace the mold.

(Mold Clamping Device of Japanese Utility Model Laid-Open No. 4-33515) (f) As described in (a) above, since the total height of the device is determined by the length of the tie bar, the specification value such as the mold opening stroke is reduced. It is difficult to lower the overall height without doing so. Also,
There is the problem (e).

(G) Clamping device disclosed in JP-A-63-104770 (G) Since the lower ends of the four tie bars are merely connected to the piston rod of the mold opening / closing cylinder, the structure moves vertically. Stiffness is low, and the high-speed opening and closing operations are likely to be unsmooth.

(H) Since the upper mold is attached to the mold clamping cylinder and moved relative to the movable platen,
The parallelism of the mold is easily damaged. It takes time and effort to replace the mold as in the case of the two mold clamping devices.

An object of the present invention is to provide a vertical mold clamping device such as an injection molding machine capable of reducing the overall height. Another object of the present invention is to provide a vertical mold clamping device, such as an injection molding machine, which can smoothly open and close the movable platen and can surely prevent unexpected fall of the movable platen when the mold is opened. is there. Another object of the present invention is to provide a vertical mold clamping device such as an injection molding machine which can keep the production cost low. Still another object of the present invention is to provide a vertical mold clamping device such as an injection molding machine that can quickly and easily perform a mold changing operation and the like.

[0015]

In order to achieve at least one of the above objects, the invention according to claim 1 is characterized in that a movable plate is lowered on a fixed plate fixed to a machine body and a movable plate is fixed to the fixed plate. In a vertical mold clamping device such as an injection molding machine for clamping a mold between molds, a plurality of tie bars are vertically inserted through the shaft hole of the fixed plate so as to be vertically movable and the lower plate is horizontally fixed at the lower end. At the upper end, the movable platen is connected to the upper end of each of the tie bars and the piston of the mold clamping cylinder, respectively, and is supported horizontally. And a plurality of mold opening / closing cylinders that move up and down together with them are provided. With a tie bar And the upper groove is engaged with the stopper has a structure obtained by attaching a clamping mechanism for fixing the movable platen in a mold closing state.

The opening / closing operation of the movable platen is performed by a mold opening / closing cylinder by removing the stopper of the clamp mechanism from the lower groove of the tie bar. The mold clamping is performed by engaging the stopper of the clamp mechanism with the upper groove of the tie bar. Do with. The clamp mechanism engages the stopper with the lower groove of the tie bar to cause the movable platen to keep the mold open, thereby preventing the movable platen from unexpectedly lowering.
The lower plate increases the rigidity of a vertically movable structure mainly composed of a movable plate and a tie bar. The conventional top board is unnecessary, the movable board is at the highest position, and each tie bar does not move up and down together with the movable board and does not protrude above the movable board, so that the overall height can be kept low.

In the above vertical mold clamping device, each of the lower plates is formed by inserting a plurality of guide rods vertically fixed between the upper frame and the lower frame of the machine body into the respective guide holes. It is preferable to adopt a configuration in which it is provided so as to be able to move up and down along. In this configuration,
Up and down movement of the movable plate becomes smooth. In the above case, the guide rod may be fixed so that the position in the radial direction can be adjusted by a plurality of adjustment bolts. In this way, even if each guide rod loses its vertical state with time, it can be corrected to be vertical, and the movable platen can be normally moved up and down for a long period of time.

The tie bar may be vertically movably inserted under a clamp mechanism into a guide hole of a guide member provided on the fixed frame or the upper frame of the machine body. With this configuration, the tie bar is guided with a wide guide width by the shaft hole of the fixed plate and the guide hole of the upper frame.

Further, the clamping mechanism is connected to two adjacent ones.
The inner stopper of one of the tie bars and the outer stopper of the other tie bar, and the outer stopper of the one tie bar and the inner stopper of the other tie bar are connected to each other by connecting rods. A fastening plate that connects the cylinder body to one of the stoppers and connects the piston rod to the other stopper, and a fixed platen or a machine. It is possible to adopt a configuration provided between the body and a guide member provided on the upper frame (claim 5). With this configuration of the clamp mechanism, a strong fixing force can be obtained, and the structure is simplified.

Further, it is preferable that a transfer table such as a mold is disposed so as to be movable substantially horizontally above the fixed platen. In the case of this configuration, during the work such as the mold replacement, the mold and the like are placed on the transfer table and carried on the fixed board, and the mold and the like are carried out of the fixed board.

[0021]

Embodiments of the present invention will be described with reference to the drawings. 1 to 8 show an embodiment of the present invention. In these figures, reference numeral 1 denotes a machine body.
A fixing plate 2 is horizontally fixed on the mounting surface 1d of the upper frame 1a of the machine body 1. Shaft holes 2a (FIG. 3) are formed at the four corners of the fixed board 2, respectively, and four cylindrical bosses 6a having guide holes 1b having the same diameter as the shaft holes 2a are provided on the lower surface of the fixed board 2. Guide members 6 are detachably attached to the respective shaft holes 2a by bolts in accordance with the positions of the shaft holes 2a. Four tie bars 3 are vertically inserted into each of the shaft holes 2a and the guide holes 1b. Each tie bar 3 is vertically movable with respect to the fixed platen 2 and the machine body 1, and has an upper groove 3a and a lower groove 3b, respectively. Each of the grooves 3 a and 3 b is formed over the entire circumference of the tie bar 3.

At the lower end of each tie bar 3, a lower plate 4 is fixed by tightening a nut 5 screwed to a screw 3c of each tie bar 3, and the four tie bars 3 are integrated. The lower platen 4 includes a pair of guide rods 7 vertically fixed between the upper frame 1a and the lower frame 1c of the machine body 1.
(FIG. 4) are inserted into the guide holes 4a and 4a, respectively, and are provided to be vertically movable along the respective guide rods 7.

The pair of guide rods 7 are disposed at an interval of 180 degrees about the center of the fixed platen 2 in a plan view, and the upper ends thereof are fixed to the fixed platen 2 with fixing bolts 8 and the lower ends thereof. Are loosely inserted into the cylindrical body 9 fixed to the lower frame 1c, and are screwed to the cylindrical body 9 at equal intervals (only two adjusting bolts 1 are shown in FIG. 4).
It is fixed by tightening 0. Accordingly, the fixing position of the guide rod 7 can be finely adjusted in the radial direction by each adjusting bolt 10 so that the guide rod 7 can be accurately made vertical.

Reference numeral 12 denotes a movable board. The movable platen 12
A mold clamping cylinder 13 is provided at each of the four corners, and a piston 13a (FIGS. 3 and 5) of each mold clamping cylinder 13 is connected to the upper end of each tie bar 3 inserted into each through hole 12a of the movable platen 12, respectively. It is horizontally supported by four tie bars 3. Further, a pair of mold opening / closing cylinders 15 are fixedly provided at one diagonal position on the upper surface of the fixed platen 2, and a piston rod 15 a extending below the pair is opened and closed by the fixed platen 2.
And is connected to the lower plate 4 with a stopper 16.

A pair of clamp mechanisms 18 (FIGS. 3, 6, and 7) are provided between the guide member 6 and the fixed board 2. The clamping mechanism 18 includes the tie bars 3 adjacent to each other,
Inner stopper 19a and outer stopper 20 which alternatively engage with the upper groove 3a and the lower groove 3b of one of the tie bars 3
a, an inner stopper 19b and an outer stopper 2 which alternatively engage with the upper groove 3a and the lower groove 3b of the other tie bar 3.
0b, the inner stopper 19a and the outer stopper 20
b are connected to each other by a pair of connecting rods 21, and the other inner stopper 19 b and the outer stopper 20 a are connected to each other by a pair of connecting rods 22.
A fastening cylinder 23 is provided between 9a and 19b by connecting the cylinder body 23a to the inner stopper 19b and connecting the piston rod 23b to the other inner stopper 19a.

The clamping mechanism 18 comprises inner cylinders 19a, 19b and outer stoppers 20a,
The movable plate 12 is engaged with the upper groove 3a of each tie bar 3 to fix the movable plate 12 in the mold closed state, and the movable plate 12 is engaged with the lower groove 3b of each tie bar 3 in the mold open state. It can be fixed. The fixed platen 2 is provided with a stopper 24 for preventing the outer stoppers 20a and 20b from moving outward excessively. Connecting rod 2
1 passes through the through hole of the inner stopper 19b, and the other connecting rod 22 passes through the through hole of the inner stopper 19a. Each of the stoppers 19a, 19b, 20a, and 20b is formed in a plate shape, and a recess having a radius substantially equal to the radius of the axis of the portion of the lower groove 3a, 3b above the tie bar 3 is provided on the side facing each other. A connecting rod 21 is formed at an end of the guide member 6 on the fixed platen side, orthogonal to the guide hole 1b.
6 along a guide groove 25 formed in a direction along 22. Fastening cylinder 23
Can be attached to the outer stoppers 20a, 20b.

A pair of guide rails 28 are laid horizontally on a gantry 27 provided on the machine body 1, and slidably support a transfer table 29. The transfer table 29 carries the dies 30a, 30b (FIG. 3) and the like, and carries the mold onto and out of the fixed platen 2. The transfer table 29 is moved along the pair of guide rails 28 by the transfer cylinder 31. Has become. The installation position of the gantry 27 and the like may be any surface of the front, rear, left and right sides of the vertical mold clamping device A (FIG. 8), other than the installation surface of the injection unit B.

Each guide hole 1b, each shaft hole 2a, and each guide hole 4
A bush b is removably fitted into a and each through hole 12a, and a liner 25a is fixed to the left, right, and lower surfaces of the guide groove 25. Each mold clamping cylinder 13, each mold opening / closing cylinder 15, each fastening cylinder 23, and the transfer cylinder 31 are all hydraulic cylinders.

Next, the operation of the vertical mold clamping device such as an injection molding machine having the above configuration will be described. 1 and 2 and 3
The left half of the figure shows the mold open state, and the clamp mechanism 18
Engages the stoppers 19a, 19b, 20a, 20b with the lower grooves 3b of the tie bars 3 and guides the guide members 6
The movable platen 12 is kept in an up state by making contact with the upper surface of the liner 25a on the bottom surface of the guide groove 25 in FIG. Therefore, the movable platen 12 does not descend, and, for example, the work of inserting the insert fitting into the lower mold 30a can be performed.

When moving the movable platen 12 downward from the above-described mold open state, the fastening cylinder 23 is reduced and the stoppers 19a, 19b, 20a, 20b are moved to the respective tie bars 3.
The lower plate 4 is pushed downward by lowering the movable platen 12 together with each tie bar 3 by extending the mold opening / closing cylinders 15 (see the lower portion of FIG. 6). Match the parting surface of 30b. Next, each of the fastening cylinders 23 is extended so that each of the stoppers 19a, 19
b, 20a, 20b are engaged with the upper groove 3a of each tie bar 3, and each tie bar 3 is fixed (see the right half of FIG. 3).

At the time of moving the movable platen 12 to close the mold,
Each tie bar 3 is guided with a large guide width by the shaft hole 2a of the fixed platen 2 and the guide hole 1b of the guide member 6, and the lower platen 4 integrally connecting the tie bars 3 is provided with an adjusting bolt 10
Is lowered along each guide rod 7 which has been accurately vertically adjusted by the fine adjustment by the above, so that the mold closing operation is smoothly performed, and an excessive force is locally applied to the piston rod 15a of the mold opening / closing cylinder 15. Gouging or breaking can be effectively prevented.

The mold clamping operation is performed by pushing the movable platen 12 downward by supplying hydraulic oil to the lower chamber 13b of each mold clamping cylinder 13 in the mold closed state. In this case, each stopper 19a, 19b, 20a, 20b abuts on the lower surface of the fixed platen 2 and receives a reaction force of mold clamping. Since each mold clamping cylinder 13 is completely independent of the mold opening / closing cylinder 15, unlike the conventional vertical mold clamping device of FIG. 9 in which the mold clamping cylinder expands and contracts in synchronization with the operation of the mold opening / closing cylinder. There is no need to increase the capacity.

When the molds 30a and 30b are closed and the molds are opened, hydraulic oil is supplied to the upper chamber 13c of each mold clamping cylinder 13 to slightly lower each tie bar 3, thereby closing the molds. The stoppers 19a, 19b, 20a, and 20b, which were sometimes strongly pressed against the lower surface of the fixed platen 2, are separated from the fixed platen 2, the fastening cylinders 23 are reduced, and the stoppers 19a, 19b, 20a, and 20b are connected to the respective tie bars 3. Remove from upper groove 3a.

Next, by reducing the size of each mold opening / closing cylinder 15, the movable platen 1 is moved through the lower platen 4 and each tie bar 3.
Raise 2. After the movable platen 12 is lifted, each of the fastening cylinders 23 is extended and each of the stoppers 19a, 19b, 20a,
20b is engaged with the lower groove 3b of each tie bar 3, and the movable platen 12 is fixed in an open state. In this mold open state, even if an abnormality occurs in a device in the hydraulic circuit of each mold opening / closing cylinder 15 and the oil pressure decreases, the movable platen 12 and the tie bar 3 retain the stoppers 19a, 19b, 20a, Since they are supported by the stopper housing 25 via the base 20b, they do not descend due to their own weight, and safety is maintained. Hereinafter, the above operation is repeated, but the movable platen 12 operates smoothly even during the mold opening operation.

In order to insert and remove the dies in the exchange work of the dies 30a and 30b, the dies are placed on the transfer table 29, and the transfer table 29 is moved by the transfer cylinder 31 along the guide rails 28. Do. For this reason, the mold replacement operation can be performed quickly and easily. In the above-described embodiment, the guide member 6 is fixed to the fixed platen 2. Alternatively, the guide member 6 may be brought into contact with the lower surface of the fixed platen 2 so that the upper surface of the guide member 6 contacts the lower surface of the fixed platen 2. It can also be provided fixed to the upper frame 1a. Further, the present invention is not limited to a vertical mold clamping device of an injection molding machine, and can be applied to a vertical mold clamping device of another device.

[0036]

As described above, according to the first aspect of the present invention, the injection molding in which the movable plate is lowered on the fixed plate fixed to the machine body and the mold is clamped between the fixed plate and the fixed plate. In a vertical mold clamping device such as a machine, the movable platen is provided at the upper end of a plurality of tie bars which are vertically inserted through the shaft hole of the fixed plate vertically movably and the lower plate is fixed horizontally at the lower end. The upper ends of the tie bars are respectively connected to the pistons of the mold clamping cylinders and are supported horizontally.Between the fixed plate and the lower plate, the movable plate is vertically moved together with the lower plate and the respective tie bars via the tie bars. A plurality of movable mold opening / closing cylinders are provided, and the movable platen is fixed to the fixed platen or the machine body by engaging a stopper with a lower groove formed in the tie bar to fix the movable platen in an open state. With the stopper in the upper groove Since the clamping mechanism for fixing the Doban with mold closing state is the configurations attached, it is possible to lower the overall height.

Therefore, even in the case of a machine carry-in port where the device has to be laid down sideways because of its slightly low height, the device can be efficiently operated in a short time without any trouble while the device is standing upright. Since it can be carried in well and the apparatus does not need to be overturned, there is no loss of assembly accuracy. Also,
The mold closing cylinder is completely independent of the mold opening / closing cylinder, and does not expand or contract when the mold opening / closing cylinder is operated. Therefore, it is not necessary to increase the capacity, and the manufacturing cost can be reduced comprehensively. Further, even if an abnormality occurs in the hydraulic circuit system of the mold opening / closing cylinder when the mold is opened, the movable plate or the like is prevented from falling by its own weight by the clamp mechanism, and safety is maintained. Further, since the tie bars are integrally connected by the lower plate, there is an effect that the rigidity is enhanced and the vertical movement is smooth.

In the above vertical mold clamping device, each of the lower plates is formed by inserting a plurality of guide rods vertically fixed between the upper frame and the lower frame of the machine body into the respective guide holes. If the movable platen is guided vertically by the guide rods, the movable platen can move up and down more smoothly. If the guide rod is configured so that its position in the radial direction can be adjusted by a plurality of adjustment bolts, even if the guide rod may lose its vertical state over time, it can be adjusted vertically for a long time. The movable platen can be moved up and down normally.

When the tie bars are vertically movably inserted into guide holes provided in the fixed frame or the upper frame of the machine body under the clamp mechanism, the guide width of the up and down movement of each tie bar is wide. Therefore, the movable plate moves up and down more smoothly. For this reason, it is mitigated that an excessive force is locally applied to the piston rod and the like of the mold opening / closing cylinder to damage them.

Further, the clamp mechanism is connected to two adjacent ones.
The inner stopper of one of the tie bars and the outer stopper of the other tie bar, and the outer stopper of the one tie bar and the inner stopper of the other tie bar are connected to each other by connecting rods, and the inner stoppers of the two tie bars are connected. Between the outer stoppers and between the outer stoppers, connecting the cylinder body to one of the stoppers and connecting the piston rod to the other stopper. When the structure is provided between the guide member provided on the upper frame of the body, the stopper is smoothly and reliably engaged with and disengaged from the upper and lower grooves of each tie bar. Each stopper comes into contact, and each stopper comes into contact with the guide member when the mold is open. As above made is, the structure is simplified.

When the transfer table such as a mold is arranged so as to be movable substantially horizontally above the fixed plate, the work of exchanging the mold can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a vertical mold clamping device such as an injection molding machine according to the present invention.

FIG. 2 is a side view of the vertical clamping device of FIG.

FIG. 3 is a cross-sectional view showing a mold open state (left half) and a mold closed state (right half).

FIG. 4 is a cross-sectional view showing a mounting structure of a guide rod.

FIG. 5 is a sectional view of a mold clamping cylinder.

FIG. 6 is a sectional view of the clamp mechanism as viewed from below.

FIG. 7 is a sectional view of a portion (VII-VII) in FIG. 6;

FIG. 8 is a plan view of a horizontal injection type vertical injection molding machine to which the present invention is applied.

FIG. 9 is a front view of a mold clamping device of a conventional injection molding machine.

FIG. 10 is also a side view.

FIG. 11 is also a plan view.

FIG. 12 is a sectional view showing a state in which a stopper rod is fixed by a lock pin.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Machine body 1a ... Upper frame 2 ... Fixed board 2a ... Shaft hole 3 ... Tie bar 3a ... Upper groove 3b ... Lower groove 4 ... Lower board 4a ... Guide hole 7 ... Guide rod 9 ... Cylindrical body 10 ... Adjustment bolt 12 ... Movable Board 12a ... Through-hole 13 ... Clamping cylinder 13a ... Piston 15 ... Mold opening / closing cylinder 15a ... Piston rod 18 ... Clamp mechanism 19a, 19b ... Inner stopper 20a, 20b ... Outer stopper 21, 22 ... Connecting rod 23 ... Fastening cylinder 23a ... Cylinder body 23b Piston rod 28 Guide rail 29 Transfer table 30a, 30b Mold 31 Transfer cylinder

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-154989 (JP, A) JP-A 52-407 (JP, U) JP-A 3-1017 (JP, U) JP-A 5-105 72421 (JP, U) Japanese Utility Model Showa 64-38399 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45/64-45/68 B29C 33/20-33/28 B22D 17/26

Claims (6)

(57) [Claims] 1. A vertical mold clamping device such as an injection molding machine for lowering a movable platen on a fixed platen fixed to a machine body and clamping a mold between the movable platen and the fixed platen. At the upper end of a plurality of tie bars vertically inserted vertically into the shaft hole and horizontally fixed to the lower end at the lower end, the movable plate is connected to the piston of the mold clamping cylinder at the upper end of each tie bar. A plurality of mold opening / closing cylinders that are horizontally supported and move the movable plate up and down together with the fixed plate and the lower plate through the lower plate and the respective tie bars are provided between the fixed plate and the lower plate. The movable platen is fixed to the body or the fixed platen by engaging a stopper in the lower groove formed in the tie bar to fix the movable platen in an open state, and the movable platen is engaged by the stopper in the upper groove formed in the tiebar. Clamp mechanism to fix in closed mold A vertical clamping device for an injection molding machine or the like, characterized by being provided with. 2. A lower board is provided so that a plurality of guide rods vertically fixed between an upper frame and a lower frame of a machine body are respectively inserted into the respective guide holes so as to be vertically movable along the respective guide rods. 2. The device according to claim 1, wherein
Vertical mold clamping device such as the injection molding machine described in the above. 3. The vertical mold clamping device for an injection molding machine or the like according to claim 2, wherein the guide rod is fixed so that its radial position can be adjusted by a plurality of adjustment bolts. 4. The tie bar according to claim 1, wherein the tie bar is vertically movably inserted into a guide hole of a guide member provided in a fixed plate or an upper frame of the machine body under the clamp mechanism. Vertical mold clamping device such as an injection molding machine described in Crab. 5. The clamping mechanism according to claim 1, wherein the inner stopper of one tie bar and the outer stopper of the other tie bar of the two tie bars adjacent to each other, and the outer stopper of the one tie bar and the inner stopper of the other tie bar are respectively connected to a connecting rod. A fastening cylinder connected between the inner stoppers of the two tie bars or between the outer stoppers to move the stoppers in a row direction connects the cylinder body to one stopper and connects the piston rod to the other stopper. The injection molding machine according to any one of claims 1 to 4, characterized in that it is provided between the fixed plate and a guide member provided on the fixed plate or the upper frame of the machine body. Vertical mold clamping device. 6. The vertical type of an injection molding machine or the like according to claim 1, wherein a transfer table such as a mold is disposed movably substantially horizontally above the fixed plate. Mold clamping device.