JPH052913U - Mold clamping device for molding machine - Google Patents

Abstract

(57) [Abstract] [Purpose] When a mold is clamped, a locking member is inserted between the mold clamping cylinder and the piston rod side, and the movable mold moves in the mold opening direction with respect to the fixed mold by the injection pressure from the injection device. To provide a mold clamping device that does not move to the ground. [Structure] A movable platen is moved by a moving cylinder until both molds of a movable mold and a fixed mold are lightly contacted with each other to drive a screw meshing adjustment device to mesh a half nut with a tie bar.
After that, pressure oil is supplied to the piston rod chamber side of the mold clamping cylinder to perform mold clamping, and a locking member is inserted between the mold clamping cylinder and the piston rod side. By doing so, burrs do not occur because both molds can safely hold the clamped state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mold clamping device for a molding machine such as an injection molding machine, a die casting machine or a press machine.

[0002]

[Prior Art]

 FIG. 6 shows a plan sectional view of a conventional mold clamping device. The mold clamping device in FIG. 6 includes a fixed plate 10, a movable plate 20, a tie bar 7, a half nut 22, a nut box 21, a connecting plate 50, a mold clamping cylinder 3, a moving cylinder 2, a fixed mold 30a, and a movable mold. 30b, stopper box 33, compression spring 32, roller 36, stopper member 34 and the like.

The fixed mold 30a is attached to a fixed platen 10 fixed on one end of the machine base 1, while it is movable on the other end side of the machine base 1 so as to face the fixed platen 10. The mold 30b is attached to the movable plate 20. The fixed rod 10 is fixedly mounted on the fixed plate 10. The tip of the piston rod 6 of the cylinder 2 is attached to the movable plate 20 so that the fixed plate 10 can slide on and off the machine base 1. The tie bar 7 penetrating the movable plate 20 is provided with a plurality (four in the present invention) of the same diameter over the entire length, one end of which is fixed to the internal piston 5 of the mold clamping cylinder 3, and the other. After the end penetrates the connecting plate 50 in a direction substantially perpendicular to the end, it is fixed by tightening with a nut or end plate 51, and at the same time, the tie bar 7 and the connecting plate 50 are locked with a key or the like to prevent the tie bar 7 from rotating. It has been prevented. Further, a screw portion or groove portion 8 is formed in a substantially middle portion of the tie bar 7 so as to mesh with a half nut 22 described later to lock the movable plate 20 to the tie bar 7. A recess 9 having a stopper surface 9a on the side of the fixed platen 10 perpendicular to the axial direction and a sloped surface 9b inclined toward the side opposite to the fixed platen 10 is provided on the rear side of the screw part or groove part 8 of the tie bar 7. Has been.

The stopper member 34 of the stopper box 33 fixedly mounted on the movable plate 20 is constantly urged by the force acting in the bottom direction of the concave portion 9, and the stopper member 34 descends the sloped surface 9 b to form the concave portion 9 1. When entering, the front surface of the stopper member 34 finally comes into contact with the vertical stopper surface 9a of the recess 9.

The stopper means in the present invention comprises a stopper box 33, a compression spring 32, a stopper member 34, a shaft 31, a bush 35 and a roller 36. A shaft 31 is fixed in the axial direction of the stopper member 34 on the upper portion of the stopper member 34 which is arranged to be slidable up and down in the stopper box 33, and the shaft 31 is formed in the upper portion of the stopper box 33. It is provided slidably through the through hole. On the other hand, below the stopper member 34, a roller 36 is rotatably supported by a support shaft 36a, and the roller 36 forms a compression spring 32 in a direction substantially perpendicular to the axis of the tie bar 7. The structure is such that it is biased and constantly pressed against the tie bar 7 so that it can move back and forth, and that it is attached to the movable plate 20 and can move back and forth in the axial direction of the tire 7. Further, a nut box 21 fixedly mounted on the movable plate 20 is internally provided with a half nut 22, which is engaged or disengaged with a screw portion or groove portion 8 engraved in the tie bar 7 at a substantially right angle during mold clamping. A hydraulic device (not shown) for the split nut was provided to remove it.

Next, the operation of the conventional mold clamping device will be described. As shown in FIG. 6, the movable plate 20 and the nut box 21 and the stopper box 33 fixed to the movable plate 20 are provided along the tie bar 7 by supplying pressure oil to the piston rod chamber side 4a of the moving cylinder 2 during mold clamping. Move to the fixed platen 10 side in the axial direction. At this time, the roller 36, which is rotatably supported by the support shaft 36a at the tip of the stopper member 34, moves while rotating on the tie bar. First, the roller 36 is engraved in the approximate middle position of the tie bar 7. The threaded portion or groove portion 8 is smoothly inserted into the insertion hole 24 of the movable plate 20. At this time, while the movable platen 20 was approaching the fixed platen 10 by the moving cylinder 2 in advance during the mold clamping operation, the half nut 22 was quickly meshed with the screw part or the groove part 8 formed in the substantially middle part of the tie bar 7. Since the operation of causing the nut nuts 21 to be performed in parallel is performed by the half nut hydraulic device, the nut box 21 fixedly provided adjacent to the movable plate 20 penetrates the concave portion 9 of the tie bar 7, and then the stopper box 33. The front surface of the stopper member 34, which is urged from the inside by the compression spring 32 and pierced, abuts against the stopper surface 9a of the recess 9 and locks the half nut 22 into the threaded portion or the tie bar 7. It is possible to surely engage the groove portion 8 quickly.

When the meshing is completed, the mold clamping of the movable plate mold 30b and the fixed plate mold 30a by the mold clamping cylinder 3 is ready to start. In this state, since the pressure oil is continuously supplied to the piston rod chamber side 4a of the moving cylinder 2, the movable mold 30b and the fixed mold 30a continue to move closer to each other. After that, by supplying pressure oil to the piston rod chamber side 5a of the mold clamping cylinder 3 fixed to the fixed platen 10, it is possible to start strong mold clamping, and injection molding was performed in this mold clamping state. ..

[0008]

[Problems to be solved by the device]

 However, the conventional apparatus supplies pressure oil to the moving cylinder 2 during mold clamping to move the movable platen 20 toward the fixed platen 10 side, and as described above, is urged by the compression spring 32 from inside the stopper box 33 to stop the stopper member 34. When the roller 36 at the tip of the tie bar 7 starts to move on the sloped surface 9b of the recess 9 in the substantially middle portion of the tie bar 7, the stopper member 34 is projected and the front surface abuts on the stopper surface 9a and is locked. , After the half nut 22 is engaged with the screw part or groove part 8 on the tie bar 7, pressure oil is further supplied to the piston rod chamber side 4a of the moving cylinder 2 and the two molds 30 are lightly contacted, The tightening action was started.

However, during the mold clamping operation, by supplying pressure oil to the piston rod chamber side 5a of the mold clamping cylinder 3, a strong mold clamping state is formed. At this point, the piston 5 moves to the right and the piston moves. A large gap is created by the rod chamber 5a. After that, when the high-pressure molten resin is injected from the injection device to the cavity, the movable mold 30b overcomes the mold clamping force and moves to the left, and as a result, the piston rod chamber 5a moves under the mold clamping state described above. A gap smaller than the gap of will be formed. There is a drawback that a minute gap is generated between the fixed molds 30a due to the leftward movement of the movable mold 30b, and a burr is generated between the molds 30.

[0010]

[Means for Solving the Problems]

 In order to solve this problem, in the present invention, a fixed plate for holding a fixed mold having a plurality of mold clamping cylinders is fixed on one end of the machine base, and a movable plate for holding the movable mold is attached to the machine base. A piston that is mounted on the other end side of the table so that it can move forward and backward while facing the fixed plate, and one end of multiple tie bars that penetrate the movable plate is slidably provided in each mold clamping cylinder. A screw part is provided in the center of the tie bar in the axial direction, and a device for moving the movable platen forward and backward toward the fixed platen is provided between the fixed platen and the movable platen so that it can mesh with the screw part on the tie bar. In the mold clamping device of the molding machine, in which a half nut is attached to the movable plate, a locking member that can be freely inserted and removed is provided on the piston rod side in the mold clamping cylinder.

[0011]

[Action]

 According to this configuration, the movable plate supplies pressure oil to the piston rod chamber side of the moving cylinder until the movable mold and the fixed mold lightly contact each other by the moving cylinder, and after the two molds make contact, Pressure oil is supplied to the piston head chamber side of the split nut opening / closing cylinder, and the screw mesh adjustment device is driven so as to mesh with the screw part or groove on the half nut and the tie bar. Alternatively, after the grooves are completely meshed with each other, pressure oil is supplied to the piston rod chamber side of the mold clamping cylinder to complete the mold clamping.

When the mold clamping is started, the piston in the mold clamping cylinder moves a minute stroke by supplying the pressure oil to the piston rod chamber side. At this point, pressure oil is supplied to the piston head side of the locking member cylinder to engage the locking member between the mold clamping cylinder and the piston rod side. Since the tip of the locking member has a wedge shape, it is easy to respond to minute stroke changes in the piston in the mold clamping cylinder, and the movable mold can be opened from the fixed mold during injection. Burr does not occur because it does not move in the direction of The mold opening is started by first draining the pressure oil on the piston rod chamber side of the mold clamping cylinder and supplying the pressure oil to the ram chamber on the piston head chamber side. Thus, by using a mold clamping cylinder with a small stroke and supplying a small amount of pressure oil to the ram chamber on the piston head side, mold clamping and mold opening can be performed easily.

[0013]

【Example】

 1 to 5 show an embodiment of a mold clamping device according to the present invention. FIG. 1 shows that a screw part or a groove part on a tie bar is meshed with a half nut when a movable mold and a fixed mold contact each other. 2 is a cross-sectional enlarged view of the screw meshing adjusting device and the tie bar locking device, and FIG. 3 is a plane cross-sectional view of the tie bar locking device viewed from the line III-III in FIG. Fig. 3 (a) shows the case where pressure oil is supplied to the piston rod chamber side of the half nut opening / closing cylinder to release the meshing of the half nut and tie bar, and Fig. 3 (b) shows the piston head of the half nut opening / closing cylinder. The operating state when pressure oil is supplied to the chamber side and the half nut and the tie bar are meshed is shown.

An embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3. The mold clamping device in FIG. 1 includes a fixed plate 10, a movable plate 20, a tie bar 7, a mold clamping cylinder 3, a moving cylinder 2, a fixed mold 30a, a movable mold 30b, a connecting plate 50, a half nut 22, a nut box. 21, a tie bar locking device 26, a screw mesh adjusting device 11, and the like. The fixed mold 30a is attached to a fixed platen 10 fixed on one end of the machine base 1, while the movable mold 30b is mounted on the other end side of the machine base 1 so as to face the fixed platen 10. Is attached to the movable plate 20. The tip ends of the piston rods 6 of the moving cylinders 2, which are fixedly mounted on both sides of the fixed plate 10, are attached to the movable plate 20, and can slide on and off the machine base 1 with respect to the fixed plate 10. .. The tie bar 7 that penetrates the movable plate 20 is provided with a plurality of tie bars 7 (four pieces in the present invention) having the same overall length, one end of which is fixed to the internal piston 5 of the mold clamping cylinder 3, After the other end penetrates the connecting plate 50 in a direction substantially at right angles, it is fixed by tightening with a nut or end plate 51, and at the same time, the tie bar 7 and the connecting plate 50 are prevented from rotating by using a key or the like. Has been done.

The mold clamping cylinder 3 described above is related to the present invention, and a piston 5 is provided in the mold clamping cylinder 3 so as to be slidable back and forth, and a packing for preventing oil leakage is arranged on the outer periphery of the piston 5. Then, the tie bar 7 is fixed to the rod side of the piston 5, and the ram 53 is provided on the head side so as to come into contact with substantially the center of the piston 5. Further, a ram 53 that engages with the ram 53 is provided so that the ram 53 can slide back and forth, and packing is provided on a sliding portion on the outer periphery of the ram 53 to prevent oil from leaking from the ram chamber 5c. It has a simple structure.

In the present invention, the outer diameter of the ram 53 is, for example, 1/2 or less of the outer diameter of the tie bar 7 or 1/3 to 1/4 or less of the outer diameter of the piston 5, and the length of the ram 53 is Is configured such that the tip end of the ram 53 contacts the inner part of the ram cylinder 52 before the head end surface side of the piston 5 contacts the end surface of the ram cylinder 52 during mold clamping. The tie bar 7 has a substantially middle portion for engaging the movable plate 20 with the tie bar 7 by meshing with a half nut 22 which will be described later when the movable mold 30b and the fixed mold 30a come into contact with each other during the mold closing operation. A screw portion or groove portion 8 is formed.

One end is fixedly mounted on the movable plate 20, and the other end is screwed with the screw portion 12 of the adjusting shaft 13 of the screw engagement adjusting device 11 described later and has a half nut 22 incorporated therein. Here, the screw mesh adjusting device 11 is composed of a screw portion 12, an adjusting shaft 13, a pressing member 17, a slide key 18, a sprocket 19, a holding plate 25, and the like.

Next, the tie bar locking device 26 will be described with reference to FIG. The tie bar locking device 26 includes a half nut opening / closing cylinder 14, a piston 15, a piston rod 16, a half nut 22, a connecting rod 101, and stoppers 102 and 103.

The half nuts 22 are provided adjacent to the movable plate 20 and each of the tie bars 7 has a pair of upper and lower half nuts 22. One end of the piston rod 16 is fixed to the end surface. Further, a piston 15 which engages with the half nut opening / closing cylinder 14 and slides vertically is disposed at the other end of the piston rod 16, and an adjusting plate 100 is fixed to the lower end of the half nut opening / closing cylinder 14. A connecting rod 101 connected through the half nuts 22a and 22b is arranged on the left and right of the piston rod 16, one end of the connecting rod 101 is fixed to the adjusting plate 100, and the other end is the half nut 22b. Is stuck to.

Then, as shown in FIG. 3 (a), by supplying pressure oil to the piston rod side chamber 15 b of the half nut opening / closing cylinder 14, the piston 15 is pushed up and the half nut opening / closing cylinder 14 is pushed up. 14 is pushed downward, and a pair of upper and lower half-split nuts 22a and 22b move while sliding on the nut box 21 to release the meshing state of the half-split nut 22 and the tire 7. , 103 is supposed to stop by abutting. When it is desired to mesh the half nut 22 with the tie bar 7, as shown in FIG. 3B, by supplying pressure oil to the piston head side chamber 15a of the half nut opening / closing cylinder 14, the piston 15 is closed. When the half nut nut opening / closing cylinder 14 is pushed upward as the half is pushed down, the half nuts 22a and 22b move while sliding on the nut box 21 and finally come into contact with each other, so that the tie bar 7 and The structure is such that meshing is performed.

Further, in the right-and-left 180 ° direction of the half nut 22, the one end of the half nut 22 has a sprocket portion 19 fixed to the end of the adjusting shaft 13 which is inserted through the tie bar 7. By turning, the end portion of the adjusting shaft 13 on the side opposite to the sprocket portion 19 is always in contact with the half nut 22 and slides. At the other end of the half nut 22, several insertion chambers for the pressing member 17 are provided in a part of the movable platen 20 on the side opposite to the fixed platen 10 for each half nut 22. The split nut 22 is pressed in the axial direction of the tie bar 7. When the adjusting shaft 13 moves to the fixed platen 10 side, the spring of the pressing member 17 is compressed and moves to the opposite fixed platen 10 side. It is arranged so that it is stretched when you do.

A sprocket portion 19 is provided on the outer peripheral portion of the adjusting shaft 13 in the vicinity of the end on the side opposite to the half nut 22, and a slip key 18 is used to prevent the adjusting shaft 13 from rotating. The sprocket part 19 is connected by a chain (not shown), and a sprocket that is integrated with the output shaft of the motor (not shown) is connected to the chain, and the chain is driven by the rotation of the motor to drive the adjustment shaft 13 in the axial direction of the tie bar 7. By moving back and forth, the position of the half nut 22 can be adjusted so that the half nut 22 abutting on the adjusting shaft 13 meshes with the threaded portion or the groove portion 8 on the tie bar 7. As for the outer circumference of the shaft of the sprocket part 19, one end is fixed to the end of the nut box 21, and the other end is fixed to the nut box 21 to prevent the sprocket part 19 from falling off. It is rotatably supported by a holding plate 25.

Next, the locking device will be described with reference to FIGS. 4 and 5. Fig. 4 shows a cross-sectional view of the locking device, Fig. 4 (a) is a state diagram before the action of the locking member, Fig. 4 (b) is a state diagram when the locking member is in action, and Fig. 5 is the locking state. It is explanatory drawing which shows the engagement state of a member. The locking device 60 includes a locking member cylinder 61, a piston 62, and a locking member 63.

First, when the mold clamping operation is started, the surfaces of the movable mold 30b and the fixed mold 30a are loosely contacted and locked, and the pressure oil is supplied to the piston rod chamber side 4a of the moving cylinder 2. Is stopped. Next, after the half nut 22 of the screw mesh adjusting device 11 has completed meshing with the screw portion or groove portion 8 on the tie bar 7, it is moved to the piston rod chamber side 5a of the mold clamping cylinder 3 fixedly mounted on the fixed platen 10. Pressure oil is supplied to move the piston 5 to the right. At this time, the tip of the locking member 63 of the locking device 60 is located at a position where it does not interfere with the forward and backward movement of the piston 5, and as shown in FIG. As shown in b), pressure oil is introduced into the head side of the piston 62 of the locking member cylinder 61 to insert the locking member 63 between the mold clamping cylinder 3 and the piston rod chamber side 5a. At this time, as shown in FIG. 5, when pressure oil is introduced into the piston rod chamber side 5a in order to further increase the mold clamping force, the piston 5 moves to the right by the distance S, so that the piston 62 of the locking member cylinder 61 moves. By further introducing pressure oil to the head side and engaging the locking member 63 having a wedge shape by the distance S, reliable mold clamping can be performed. In the present invention, two locking devices are arranged facing each other on one mold clamping cylinder 3, but three or more locking devices may be provided between them.

Next, the operation of the mold clamping device of the present invention thus constructed will be described. In the mold clamping device configured as described above, when the mold is closed, pressure oil is supplied to the piston rod chamber side 4a of the moving cylinder 2 so that the movable platen 20 and the nut box 21 fixed to the side surface of the movable platen 20 or The screw mesh adjusting device 11 and the like move together in the axial direction of the tie bar 7 toward the fixed plate 10 side. First, the screw portion or groove portion 8 engraved in the substantially middle portion of the tie bar 7 is smoothly inserted into the insertion hole 24 of the movable plate 20, and the movable plate 20 is further moved forward, so that the movable die is firstly moved. The surface of 30b and the fixed die 30a are brought into contact with each other slowly and locked, whereby the supply of pressure oil to the piston rod chamber side 4a of the moving cylinder 2 is stopped.

Next, the half nut 22 starts to mesh with the threaded portion or the groove portion 8 on the tie bar 7. First, when pressure oil is supplied to the piston head chamber side 15a in the half nut opening / closing cylinder 14 through a pipe (not shown), the half nut 22 advances in a direction substantially perpendicular to the tie bar 7. Here, when the movable mold 30b and the fixed mold 30a are in contact with each other, the mold thickness (die height) H of both molds is measured with a scale in advance, and this is measured on the screw part or groove part 8 on the tie bar 7. When divided by the pitch P of (H / P), if there is no fraction below the decimal point due to division, the piston head chamber of the half-nut nut open / close cylinder 14 with both dies in light contact. If pressure oil is supplied to the side 15a, the half nut 22 will be completely meshed with the threaded portion or the groove portion 8 on the tie bar 7. However, conversely to the above, when the H / P is not divisible and a fraction less than the decimal point occurs, the pitch of the threaded portion 8 on the tie bar 7 (or half division) is generated at the fraction less than the decimal point. The value obtained by multiplying the pitch P of the screw of the nut 22 is the moving distance A for completely meshing the half nut 22 and the screw portion 8 on the tie bar 7.

That is, after the two dies are lightly contacted with each other, the motor connected by the chain is rotated by an amount commensurate with the moving distance A to rotate the sprocket 19 and move the adjusting shaft 13 forward and backward. However, the rotation of the motor can be measured in pulses and converted into the moving distance before and after the adjustment shaft 13. Thus, the half nut 22 can be completely meshed with the threaded portion 8 on the tie bar 7. Further, when the meshing is completed, the mold clamping of the movable plate mold 30b and the fixed plate mold 30a by the mold clamping cylinder 3 is ready to start. Then, by supplying pressure oil to the piston rod chamber side 5a of the mold clamping cylinder 3 fixed to the fixed platen 10, strong mold clamping can be started.

After the mold is clamped, pressure oil is introduced to the head side of the piston 62 of the locking member cylinder 61 to simultaneously lock the locking member 63 between the mold clamping cylinder 3 and the piston rod side 5a. Injection molding is performed with this mold clamped. When the mold is opened, the pressure oil on the head side of the piston 62 of the locking member cylinder 61 is released, and the pressure oil is supplied to the rod side to move the locking member 63 to the mold clamping cylinder 3 and the piston rod side 5a. Retreat from between. Next, when the pressure oil on the piston rod chamber side 5a is released and withdrawn, and at the same time, the pressure oil is supplied to the ram chamber 5c, the piston 5 in contact with the ram 53 moves to the retreat side and mold opening starts. Will be.

In the present invention, as shown in FIG. 1, it is necessary to engrave a screw part or a groove part 8 on the tie bar 7 longer than in the conventional example shown in FIG. Since the mold clamping operation is performed by the cylinder 3, the stroke of the mold clamping cylinder 3 is conversely short. Although the case where the spring 17 is used as the pressing member 17 has been described in FIG. 2, the present invention is not limited to this, and the ram chamber is provided in a part of the movable plate 20 on the side opposite to the stationary plate 10 instead of the spring 17. A ram fixedly provided on the side surface of the half nut 22 is slidably provided here, and the adjusting shaft 13 is constantly moved by the pressure oil or compressed air supplied to the ram chamber. You may make it press in the direction. Further, a gear may be used instead of the sprocket 19 shown in FIG.

Regarding the die height H, the case of measuring with a scale has been described. However, a scale sensor for automatically detecting the die height H is provided, and this data is automatically input to the computer and input in advance. As described above, when the H / P is not divisible, the sprocket is set so that the half nut 22 and the screw portion 8 on the tie bar 7 are completely meshed. A necessary pulse is issued to a motor connected to the motor 19 via a chain by a command from a computer, and the rotation of the sprocket 19 corresponding to this causes the adjusting shaft 13 to operate as the required moving distance A back and forth. Well, if the H / P is split, the half nut 22 supplies pressure oil to the screw part 8 on the tie bar 7 and the piston head chamber side 15a in the half nut opening / closing cylinder 14 on the spot. Then, a command from the computer may be issued so as to be engaged, or it may be done manually. In the present invention, the end surface of the ram 53 on the piston 5 side and the end surface of the ram 53 on the ram 53 side are not fixed, but the invention is not limited to this, and the piston 5 and the ram 53 may be fixed. ..

[0031]

[Effect of the device]

 As described above, according to the present invention, in the conventional device, the half nut and the thread or groove on the tie bar mesh with each other when the stopper member comes into contact with the step on the tie bar regardless of the die thickness. Therefore, the mold opening stroke is always constant, but a mold clamping cylinder having a stroke with a length that is the difference between the maximum and minimum mold thickness is required, and a large amount of working pressure oil is required.

In the present invention, regardless of the size of the mold, the movable platen is moved by the moving cylinder, and only the final mold clamping is performed by the mold clamping cylinder, so the working hydraulic oil is small. In addition, since the piston head side has a structure in which a ram that is considerably smaller than the piston is fixed, the amount of pressure oil when the mold is opened can be further reduced, and the pressure oil supply device can be small. Also becomes shorter. In addition, since the movable clamp does not move in the mold opening direction with respect to the fixed mold at the time of injection by providing a locking member that can be freely taken in and out on the piston rod side in the mold clamping cylinder, there is no burr between the molds. Does not happen.

[Brief description of drawings]

FIG. 1 is a plan vertical cross-sectional view in which a half nut is engaged with a screw part or groove part on a tie bar when a movable mold and a fixed mold according to the present embodiment are in contact with each other.

FIG. 2 is an enlarged cross-sectional view of a screw meshing adjustment device and a tie bar locking device according to the present embodiment.

FIG. 3 is a horizontal cross-sectional view of the tie bar locking device viewed from the line III-III in FIG. 1 according to the present embodiment.

FIG. 4 is a cross-sectional view of the locking device according to the present embodiment.

FIG. 5 is an explanatory view showing an engaged state of the locking member according to the present embodiment.

FIG. 6 is a vertical cross-sectional view showing an example of a conventional device similar to the present invention.

[Explanation of symbols]

 1 Machine Base 2 Moving Cylinder 3 Mold Clamping Cylinder 4, 5 Piston 6 Piston Rod 7 Tie Bar 8 Screw Part or Groove 9 Recess 10 Fixing Plate 11 Screw Engagement Adjusting Device 13 Adjusting Shaft 14 Half Nut Opening / Cylinder 17 Pressing Member 19 Sprocket 20 Movable plate 21 Nut box 22 Half nut 26 Tie bar locking device 30a Fixed mold 30b Movable mold 33 Stopper box 34 Stopper member 50 Connecting plate 52 Ram cylinder 53 Ram 60 Locking device 61 Locking member cylinder 62 Piston 63 Locking member

Claims (1)

[Claims for utility model registration] [Claim 1] A fixed plate for holding a fixed mold having a plurality of mold clamping cylinders is fixed to one end of a machine base, and a movable plate for holding a movable mold is machined. It was placed on the other end of the base so that it could move forward and backward while facing the fixed plate, and one end of multiple tie bars that penetrated the movable plate was provided slidably in each mold clamping cylinder. As a piston part, a screw part is provided at approximately the center of the tie bar in the axial direction, and a device for moving the movable platen forward and backward toward the fixed platen is provided between the fixed platen and the movable platen so that it can mesh with the screw part on the tie bar. A mold clamping device for a molding machine, in which the provided half nuts are mounted on a movable plate, and a locking member that can be inserted into and removed from the piston rod side of the mold clamping cylinder.