JP2007331332A - Tie bar reverse pull-out mold clamping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold clamping device enabling a simple and easy pull-out operation without necessitating a big space for the evacuation of a tie bar or a large pull-out device. <P>SOLUTION: In the mold clamping device in which the tie bar is inserted in insertion holes mounted in a movable platen and a fixed platen respectively and the movable platen is arranged forward backward movably to the fixed platen along the tie bar, (a) after the mold is closed by pressing the movable platen to the fixed platen, there are mounted on both sides of the insertion hole of the movable platen the first engagement means engaging with an engagement part formed in the end part of the tie bar on the movable platen side and a tie bar cover protecting the tie bar respectively; (b) the second engagement means engaging with an engagement part formed in the end part of the tie bar on the fixed platen side is removably attachably mounted at the end part of a mold clamping piston by a removal and attachment stopping means; (c) a press means further pressing the closed movable platen after clamping the mold in cooperation with the tie bar is mounted in the tie bar insertion hole of the fixed platen; and (d) the third engagement means engaging with an engagement part formed in the end part of the tie bar on the movable platen side, the third engagement means capable of going in and out, is mounted in each of the base bottom part and the tip end part of the tie bar cover. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

  In general, a die-casting machine or an injection molding machine mold clamping device has a fixed plate that supports a fixed mold and a movable plate that supports a movable mold arranged on a base plate, and tie bars that are inserted through the movable plate (usually four). The end of this is fixed to a fixed platen, and the movable platen is moved back and forth with respect to the fixed platen along the tie bar to open and close the mold, thereby producing a cast or molded product.

  In casting (or die casting) and injection molding using the above mold clamping device, it is necessary to replace the mold due to changes in the cast or molded product, wear of the mold, etc. Because the presence of tie bars can be an obstacle to mold replacement work, in order to ensure safety and ease of work, a structure is usually adopted in which the tie bars are pulled out from the fixed platen to the movable platen ( For example, see Patent Documents 1 to 5).

  FIG. 1 shows an aspect of a conventional mold clamping device (see Patent Document 4). A fixed platen 2 that supports the fixed mold 3 is fixed on the base plate 1, and a movable platen 4 that supports the movable mold 5 is disposed so as to be movable back and forth with respect to the fixed platen 2 via a slide shoe 6. Has been.

  Then, one end of the tie bar 10 passing through the insertion holes 7 and 8 provided at the four corners of the fixed plate 2 and the movable plate 4 is opened and closed to be screwed into the screw portion 13 in the first fixing device 11 (box 14). The possible split nut 15 is arranged), and is fixed to the stationary platen 2 in a detachable manner. In addition, the intermediate portion of the tie bar 10 can be attached to and detached from the movable platen 4 by the second fixing device 12 (in the box 17, an openable / closable split nut device 18 that is engaged with the multi-groove portion 16 is disposed). It is fixed.

  A hydraulic cylinder 20 is mounted on the movable platen 4 in correspondence with the arrangement position of the tie bar 10. The tip of the rod 20a of the upper hydraulic cylinder 20A mounted on the upper part of the movable platen 4 is connected to the other end of the upper tie bar 10 via the connecting member 21 and mounted on the lower part of the movable platen 4. The tip of the rod 20b of the lower hydraulic cylinder 20B (partially housed in the slide shoe 6) is connected to the other end of the lower tie bar 10 via a connecting member 21.

  If the hydraulic cylinder 20 (the upper hydraulic cylinder 20A and the lower hydraulic cylinder 20B) is expanded and contracted in a state where the tie bar 10 is fixed by the first fixing device 11 and the tie bar 10 is released from being fixed by the second fixing device 12. Since the tie bar 10 is fixed, the movable platen 4 can move forward and backward with respect to the fixed platen 2 to perform mold opening and closing.

  When exchanging the fixed mold 3 and the movable mold 5, the tie bar 10 is released from being fixed by the first fixing device 11 in the mold open state, and then the upper hydraulic cylinder 20A is extended to the maximum extent. Since the position of the movable platen 4 is fixed by the lower hydraulic cylinder 20B, the above operation of the upper hydraulic cylinder 20A causes the upper tie bar 10 to retreat, and the upper part between the fixed platen 2 and the movable platen 4 is opened. A work space is formed, and the mold replacement work can be performed without any trouble.

  As described above, the conventional mold clamping device employs a structure in which the tie bar 10 is pulled out to the rear of the movable platen at the time of mold replacement. Therefore, when installing the mold clamping device in the factory, In addition, it is necessary to provide a sufficient space for evacuating tie bars.

  However, as described above, the tie bar retracting space is a space prepared only for retracting the tie bar when the mold is replaced, and is a space that is not used at all while the mold clamping device is operating. Moreover, when the tie bar is retracted, it is necessary to avoid damage and damage to the tie bar due to collision or contact with other devices and devices, so avoid placing other devices and devices in the tie bar retracting space. There must be.

  As the mold clamping device becomes larger, the space for evacuating the tie bar must be increased accordingly.However, in the limited arrangement space, it is not possible to increase the space for evacuating the tie bar that is used only for mold replacement. As such, it is not preferable in terms of effective use of the arrangement space. Also, if the space for retracting the tie bar is large in a limited arrangement space, the space for arranging various devices necessary for controlling the mold clamping device will inevitably become narrow, and various control devices will be overcrowded in a narrow space. This creates a situation that must be arranged, which worsens the work environment and makes maintenance and inspection work for control equipment difficult.

  In Patent Documents 1 to 5 shown as examples, tie bar pulling technology in a mold clamping device is disclosed, but in each case, a structure in which a tie bar is pulled out from the fixed platen side to the rear side of the movable platen side at the time of mold replacement. Since it is adopted as a premise structure, when the mold clamping device is installed in a factory, it is necessary to provide a sufficient tie bar retracting space behind the movable platen. In other words, the conventional mold clamping device has not been devised or improved from the viewpoint of effective use of the arrangement space.

JP-A-8-72113 JP-A-9-57803 JP 2000-52353 A JP 2005-144802 A Japanese Patent Laid-Open No. 2006-880

  In view of the above-described situation, the present invention does not require a large tie bar retracting space or a large extraction device even when the mold clamping device is enlarged when the tie bar is extracted at the time of exchanging the mold, and the extraction operation It is an object of the present invention to provide a mold clamping device capable of simply and easily performing the above.

  As a result of earnestly examining the means for solving the above problems, the present inventor found that the tie bar was moved in the direction opposite to the direction of pulling out the tie bar in the conventional mold clamping device, from the movable plate to the rear of the fixed plate (the mold mounting surface and Based on the idea of “extruding to the opposite surface side (hereinafter sometimes referred to as“ anti-mold mounting surface side ”)”, a means for realizing this extrusion (reverse extraction) easily and easily was found.

  This invention was made | formed based on the said knowledge, and the summary is as follows.

(1) In a mold clamping device in which a tie bar insertion hole is provided in the movable platen and the fixed platen, the tie bar is inserted, and the movable platen is disposed so as to be movable forward and backward along the tie bar.
(A) After the movable platen is pressed against the fixed platen and the mold is closed, the first engaging means that engages with the engaging part formed at the movable platen side end of the tie bar, and the tie bar cover that protects the tie bar, Provided on both sides of the movable plate tie bar insertion hole,
(B) The second engaging means that engages with the engaging portion formed at the fixed platen side end portion of the tie bar is detachably provided at the end portion of the mold clamping piston using the attaching / detaching engaging means,
(C) In cooperation with the tie bar, a pressing means for further pressing the movable platen after closing the mold against the fixed platen is provided in the tie bar insertion hole of the fixed platen,
(D) A tie bar reverse feature characterized in that a third engaging means for engaging with an engaging portion formed at the end of the tie bar on the movable platen side is provided at the base part and the tip part of the tie bar cover so as to be able to enter and exit, respectively. Die clamping device.

  (2) The engagement portion formed at the movable platen side end portion of the tie bar is a groove forming portion, and the first engagement means is a split nut means. Tie bar reverse punching device.

  (3) The tie bar reverse punching mold clamping device according to (1) or (2), wherein the pressing means is a fluid cylinder mechanism.

  (4) The above-mentioned (1) to (1), wherein the engaging portion formed on the fixed plate side end portion of the tie bar is a spiral groove forming portion, and the second engaging means is a fixing nut means. 3) The tie bar reverse punching clamping device according to any one of 3).

  (5) The tie bar reverse punching clamping device according to any one of (1) to (4), wherein the attachment / detachment locking means includes a presser plate and a presser plate moving device.

  (6) The tie bar reverse punching clamping device according to (5), wherein the presser plate moving device includes driving means including a horseshoe-type liner, a liner guide, and a fluid cylinder.

  (7) The tie bar reverse punching clamping device according to any one of (1) to (6), wherein the third engagement means includes an engagement plate and an engagement plate insertion device.

  (8) The tie bar reverse punching clamping device according to (7), wherein the third engagement means includes drive means including a horseshoe type liner, a liner guide, and a fluid cylinder.

  In the present invention, the tie bar can be easily and easily pushed out in the direction from the movable platen to the fixed platen (on the side opposite to the mold mounting side), contrary to the conventional mold clamping device. It is possible to increase the degree, and it is possible to perform the mold exchanging work quickly and safely.

  The present invention will be described with reference to the drawings.

  FIG. 2 shows an embodiment of the mold clamping device of the present invention (hereinafter simply referred to as “the present invention”). In addition, about the same structural member as the mold clamping apparatus shown in FIG. 1, it showed with the same number as the number shown in FIG.

  A fixed platen 2 that supports the fixed mold 3 is fixed to the end of the base plate 1, and a movable platen 4 that supports the movable mold 5 is mounted on the base plate 1 via a movable plate support member 6a. It is arranged so as to be able to advance and retreat with respect to the fixed platen 2.

  An extrusion device 29 for taking out a cast or molded product from the movable mold 5 is attached to the back surface of the movable platen 4, and the movable platen 4 is attached to the lower end of the movable platen 4 and the movable plate support member 6a. A mold opening / closing device 24 that opens and closes the mold by moving it back and forth with respect to the fixed platen 2 is attached.

  FIG. 2 shows the mold clamping apparatus with the mold opened.

  The fixed platen 2 is provided with an injection sleeve 30a connected to the fixed mold 3. With the mold closed, the injection device 30 presses the molten metal into the mold through the injection sleeve 30a. .

  Tie bar insertion holes 7 and 8 are formed at the four corners of the fixed platen 2 and the movable platen 4, and the tie bars 10 are inserted through the insertion holes 7 and 8. A tie bar cover 10 a is connected to the tie bar insertion holes 7 and 8 of the movable platen 3, and a tie bar support 10 b for supporting the tie bar 10 is disposed outside the lower tie bar insertion hole 8.

  In the upper tie bar 10, a split nut device 22 (first engagement means) connected to the tie bar insertion holes 7 and 8 at the middle portion of the lower tie bar 10 and closer to the end on the movable platen side. ) And the engaging portions 10x and 10y that engage with the split nut are formed. In the engaging portions 10x and 10y, a groove that engages with the split nut is formed.

  The end of the tie bar 10 on the fixed platen side is provided with an engaging portion 10z in which a spiral groove that engages with a nut of the fixed nut device 23 (second engaging means) is formed.

  Clamping cylinders 25 (pressing means) having pistons 27 and oil chambers 28 and 29 are disposed in the tie bar insertion holes 7 and 8 of the fixed platen 2, and a fixing nut device 23 (second engaging means). However, the upper clamping cylinder 25 (the upper clamping cylinder 25 (the holding plate moving means) and the holding plate moving means 33 (moving up and down in the drawing) driven by the holding plate moving apparatus 33 are attached and detached. It is detachably connected to the end of the piston 27 of the pressing means.

  After closing the mold, a hydraulic mechanism (not shown) is controlled by the power unit 31, and the oil is discharged from the oil chamber 29 and the piston 27 is driven while feeding the oil to the oil chamber 28. By driving the piston 27, the fixing nut device 23 (second engagement) that is tightly connected to the end of the piston 27 by the pressing reaction force of the pressing plate 32 and that is engaged with the engaging portion 10z of the tie bar 10 is obtained. Means) receives a pressing force in the direction opposite to the die mounting surface (right direction in the figure), and therefore the movable platen 4 after the mold closing is further pressed by the fixed platen 2 and the mold clamping operation is followed by the mold clamping. The action is performed.

  The presser plate moving device 33 (presser plate moving means) holds the presser plate 32 in a position where the connection between the fixing nut device 23 and the end of the piston 27 is firmly held during clamping, and when the tie bar is pulled out, The retainer plate 32 is moved (lifted upward in the figure) to function to release the connection between the fixing nut device 23 and the end of the piston 27.

  The presser plate moving device 33 can be configured by mechanical means such as a horseshoe-type liner, a liner guide, and a fluid cylinder, for example, in order to realize the above function, but is configured by other mechanical means. It may also be configured by electrical means. The means for realizing the function of the presser plate moving device 33 is not limited to a specific mechanical means or electrical means.

  In the mold clamping device shown in FIG. 2, the engagement plate insertion device for inserting the engagement plate 32a that engages with the movable platen side end portion of the tie bar 10 into the base portion of the tie bar cover 10a through the tie bar cover 10a. 34a is attached, and an engaging plate insertion device 34b for inserting an engaging plate 32b that engages with the movable side end of the tie bar 10 through the tie bar cover 10a is also attached to the tip of the tie bar cover 10a. ing.

  That is, in the mold clamping device shown in FIG. 2, the tie bar 10 is moved by the cooperation of the engagement of the engagement plates 32a and 32b with the movable side end of the tie bar 10 and the forward and backward movement of the movable plate 4 with respect to the fixed plate 2. Adopting a structure of pushing out from the tie bar insertion hole 7 of the fixed platen 2 in the direction opposite to the direction of pulling out the tie bar in the conventional mold clamping device, that is, the side where the injection device 30 is disposed (the side opposite to the mold mounting surface). ing. This is a feature of the present invention.

  As described above, according to the present invention, when the mold is replaced, the tie bar can be moved by the reciprocating movement of the movable plate with respect to the fixed plate without using a hydraulic mechanism for pulling the tie bar or other drawing devices. A working space is formed in the upper part of the movable platen and the fixed platen by extruding to the direction opposite to the tie bar pulling direction in the apparatus, that is, the side opposite to the die mounting surface.

  Here, the aspect of the tie bar extrusion operation will be described with reference to FIGS.

  3A, the split nut moving device 19 is driven to engage the split nut device 22 with the engaging portion 10x of the tie bar 10, while the fixed nut engaged with the end of the tie bar 10 on the stationary platen side. The device 23 (second engaging means) is connected to the cylinder 27 by the presser plate 32, the mold clamping cylinder 25 is driven, and the fixed mold 3 and the movable mold 5 are clamped.

  During operation of the mold clamping device, the engagement plate 32a and the engagement plate 32b are pulled upward by the engagement plate insertion device 34a and the engagement plate insertion device 34b, respectively, and are not involved in the casting operation, Therefore, when the tie bar 10 is pushed out and when the tie bar 10 is pulled in after the mold replacement, the function is exhibited.

  FIG. 5 shows an aspect of the engagement plate. The semi-annular engagement plate 32a (32b) engages with a step portion 10c formed at the end of the tie bar 10 to allow the tie bar 10 to be pushed out and retracted by reciprocating movement of the movable plate with respect to the fixed platen.

  Note that the shape and structure of the tie bar step and the shape and structure of the engagement plate that engages with the step are those that can maintain an appropriate engagement state that allows the tie bar to be pushed out and retracted. What is necessary is just and it is not limited to a specific shape and structure.

  Hereinafter, an operation of pushing the tie bar to the side opposite to the die mounting surface from the mold clamping state shown in FIG.

  3 (b), the split nut moving device 19 is driven to release the engagement of the tie bar 10 to the engaging portion 10x by the split nut device 22, the movable platen 4 is pulled away from the fixed platen 2, and the mold is moved. Indicates open state. At this time, the movable platen 4 is retracted to a position where the engaging plate 32a can be inserted into a step portion (see FIG. 5) formed at the end of the tie bar 10 (see the left arrow in the drawing). In order to replace the mold, an operation of pushing the tie bar to the anti-mold mounting surface side is started from this state.

  Next, as shown in FIG. 3 (c), on the fixed platen side, the holding plate moving device 33 is driven to pull up the holding plate 32 and hold the end of the tie bar 10 (first nut device 23). (2 engaging means) and the piston 27 are released, and the engaging plate moving device 34a is driven to insert the engaging plate 32a into the step portion of the end portion of the tie bar 10 (in the drawing, an upward arrow and a downward arrow, reference).

  Next, as shown in FIG. 3D, the movable platen 4 is moved forward until the movable mold 5 comes into contact with the fixed mold 3 (see the right arrow in the figure). Since the connection between the fixed nut device 23 (second engagement means) and the piston 27 is released, the tie bar 10 passes through the tie bar insertion hole 7 of the fixed platen 2 as the movable platen 4 advances, Extruded to the mold mounting surface.

  As shown in FIG. 3 (d), in the first extrusion, the tie bars corresponding to the movable mold and the fixed mold remain between the movable platen 4 and the fixed platen 2, so that the second time Then, the remaining part is further pushed out to the side opposite to the die mounting surface.

  As shown in FIG. 4 (e), the engagement plate moving device 34 a is driven, the engagement plate 32 a is pulled up from the step portion of the tie bar 10, and the movable platen 4 is moved backward. When the movable platen 4 is retracted, the tie bar 10 stays at that position, so that the movable platen 4 is driven back to a position where the engagement plate moving device 34b can be driven and the engagement plate 32b can be inserted into the step portion of the tie bar 10 ( (See left arrow in the figure).

  Next, as shown in FIG. 4F, the engagement plate moving device 34b is driven, and the engagement plate 32b is inserted into the step portion of the tie bar 10 (see the downward arrow in the figure). After the insertion, as shown in FIG. 4G, the movable platen 4 is advanced again until it comes into contact with the fixed platen 2 again (refer to the right arrow in the figure).

  As the movable platen 4 moves forward, as shown in FIG. 4G, the tie bar 10 can be pushed out from the tie bar insertion hole 7 of the fixed platen 2 to the side opposite to the die mounting surface by the length of the tie bar cover 10a. it can.

  Then, after the tie bar is pushed out, as shown in FIG. 4 (h), the engaging plate moving device 34b is driven to pull up the engaging plate 32b from the stepped portion of the tie bar 10, and the movable platen 4 is moved backward to move the engaging plate 32b. A working space sufficient for mold replacement work is formed between the board 4 and the stationary board 2 (see the left arrow in the figure).

  As described above, in the present invention, the tie bar is pushed out to the anti-mold mounting surface side, that is, the side where the devices and equipment are installed. Therefore, when the mold clamping device is arranged in the factory, the conventional mold is used. Unlike the case where the fastening device is installed, it is not necessary to provide a space for retracting the tie bar in the space behind the movable platen.

  If the present invention is applied, the space behind the movable platen of the mold clamping device can be effectively used for some applications. As a matter of course, a mold for replacement or replacement, or equipment for mold replacement may be placed in the space.

  As shown in FIGS. 3 and 4, in the present invention, the tie bar can be quickly pushed out to the anti-die mounting surface side by the cooperative driving of the engaging plate moving device and the movable platen at the time of changing the die.

  As described above, in the present invention, the upper part between the fixed platen and the movable platen can be immediately opened widely by the quick tie bar extrusion, so that the mold exchange operation can be performed without any trouble. Since the mold for replacement or replacement and the equipment for mold replacement can be placed close to each other, the mold replacement work can be performed quickly and safely.

  Although the embodiment of the tie bar extrusion operation in the present invention has been described above, after the die replacement operation is completed, the operation opposite to the tie bar extrusion operation is performed, and the tie bar is pulled into the tie bar insertion holes of the movable platen and the fixed platen.

  In the mold clamping device of the present invention, the tie bar extrusion / drawing operation can be quickly performed in the space occupied by the mold clamping device including peripheral devices, so that the safety of the tie bar extrusion / drawing operation can be increased. While securing, it is possible to speed up and secure the mold exchanging work.

  As described above, in the present invention, the tie bar can be pushed out easily and easily in the direction from the movable platen to the fixed platen (on the side opposite to the mold mounting side), contrary to the conventional mold clamping device. The utilization of the arrangement space can be increased, and the mold exchanging work can be performed quickly and safely. Therefore, the present invention has a high possibility of being employed in a mold clamping apparatus such as a newly installed die casting machine or an injection molding machine.

It is a figure which shows the one aspect | mode of the conventional mold clamping apparatus. It is a figure which shows the one aspect | mode of the mold clamping apparatus of this invention. It is a figure which shows the aspect of operation which pushes out a tie bar in the mold clamping apparatus of this invention. (A) shows the state which clamped the fixed mold and the movable mold. (B) shows the state which opened the metal mold | die. (C) shows a state in which the connection between the fixing nut device holding the tie bar and the piston is released and the engaging plate is inserted into the step portion of the tie bar. (D) shows the state which advanced the movable metal mold until it contacted the fixed metal mold. It is a figure which shows the aspect of operation which pushes out a tie bar following the aspect shown to Fig.3 (a)-(d). (E) shows a state in which the movable platen is retracted to a position where the engagement plate can be inserted into the step portion of the tie bar. (F) shows the state which inserted the engagement board in the step part of the tie bar. (G) shows the state in which the movable plate is advanced again until it contacts the fixed platen 2 again. (H) shows a state in which a work space sufficient for mold replacement work is formed between the movable platen and the fixed platen. It is a figure which shows the one engagement aspect of the step part of a tie bar, and an engagement board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base plate 2 Fixed board 3 Fixed metal mold 4 Movable board 5 Movable metal mold 6 Slide shoe 6a Movable board support member 7, 8 Tie bar insertion hole 10 Tie bar 10a Tie bar cover 10b Tie bar support 10c Step part 10x, 10y, 10z Engagement part 11 First fixing device 12 Second fixing device 13 Screw portion 14, 17 Box 15, 18, 22 Split nut device 16 Multi-groove portion 19 Split nut moving device 20 Hydraulic cylinder 20A Upper hydraulic cylinder 20B Lower hydraulic cylinder 20a, 20b Rod 21 Connecting member 23 Fixing nut 24 Mold opening / closing device 25 Mold clamping cylinder 26 Cylinder portion 27 Piston 28, 29 Oil chamber 29 Extruding device 30 Injection device 30a Injection sleeve 31 Power unit 32 Presser plate 32a, 32b Engaging plate 33 Presser plate moving device 34a, 3 4b Engagement plate moving device

Claims (8)

In a mold clamping device in which a tie bar insertion hole is provided in the movable platen and the fixed platen, and the tie bar is inserted, and the movable platen is disposed so as to be movable forward and backward with respect to the fixed platen along the tie bar.
(A) After the movable platen is pressed against the fixed platen and the mold is closed, the first engaging means that engages with the engaging part formed at the movable platen side end of the tie bar, and the tie bar cover that protects the tie bar, Provided on both sides of the movable plate tie bar insertion hole,
(B) The second engaging means that engages with the engaging portion formed at the fixed platen side end portion of the tie bar is detachably provided at the end portion of the mold clamping piston using the attaching / detaching engaging means,
(C) In cooperation with the tie bar, a pressing means for further pressing the movable platen after closing the mold against the fixed platen is provided in the tie bar insertion hole of the fixed platen,
(D) A tie bar reverse feature characterized in that a third engaging means for engaging with an engaging portion formed at the end of the tie bar on the movable platen side is provided at the base part and the tip part of the tie bar cover so as to be able to enter and exit, respectively. Die clamping device.   2. The tie bar reverse punching die according to claim 1, wherein the engaging portion formed at the movable platen side end portion of the tie bar is a groove forming portion, and the first engaging means is a split nut means. Fastening device.   The tie bar reverse punching mold clamping apparatus according to claim 1 or 2, wherein the pressing means is a fluid cylinder mechanism.   The engaging portion formed at the fixed platen side end portion of the tie bar is a spiral groove forming portion, and the second engaging means is a fixing nut means. The tie bar reverse punching mold clamping device according to the item.   The tie bar reverse punching device according to any one of claims 1 to 4, wherein the attachment / detachment locking means includes a presser plate and a presser plate moving device.   6. The tie bar reverse punching clamping device according to claim 5, wherein the presser plate moving device includes driving means including a horseshoe type liner, a liner guide, and a fluid cylinder.   The tie bar reverse punching clamping device according to any one of claims 1 to 6, wherein the third engagement means includes an engagement plate and an engagement plate insertion device.   The tie bar reverse punching clamping device according to claim 7, wherein the third engagement means includes a drive means including a horseshoe-type liner, a liner guide, and a fluid cylinder.

Images