Jaw tightening device

Abstract

The present invention relates to a clamping device having novel features, which can be used inside an injection molding machine to counteract forces that tend to open the mold during injection of plastic material. More specifically, the present invention relates to a mold clamping unit equipped with a novel jaw clamping device. It has the role of counteracting the opening force generated by filling and the opening force generated by the molding pressure applied from the injection unit itself, thereby overcoming the technical shortcomings that frequently occur in conventional injection molding machines.

Description

Technical Field

[0001] The present invention relates to a clamping device having novel features, which can be used inside an injection molding machine to counteract the forces that tend to open the mold during the injection of plastic material.

[0002] Specifically, the present invention relates to a mold clamping unit equipped with a novel jaw clamping device. It has the role of counteracting the opening forces caused by the filling and the compression pressure applied from the injection unit itself, thereby overcoming the technical drawbacks frequently occurring in conventional injection molding machines.

Background Art

[0003] An injection molding device consists of several members, which are available in various configurations, namely horizontal and vertical configurations. Any type of machine uses a power source, an injection unit, a molding unit, and a mold clamping unit, and performs the steps of the molding cycle regardless of size.

[0004] The injection unit is defined as a set of components that contribute to the plasticizing process of the polymer. The main ones are: a plasticizing screw rotated by a plasticizing motor, a feeding hopper, a polymer granule mixer and dryer, and a melt injection cylinder. An injection molding machine is characterized by a mold clamping unit, and its mold clamping force (in tons) represents the mold clamping force required to keep the mold closed during the injection process. Therefore, the pressure that can be developed on the mold to continuously clamp the mold during the injection of the polymer material is measured in metric tons or kilonewtons (kN). The required mold clamping force is proportional to the surface area of the mold shape and the pressure at which the material is injected. The mold clamping unit has the role of continuously closing the two halves of the mold tightly. When the mold is attached to the molding machine, by means of plates, the female member of the mold (also known as the die) is fixed to the fixed side, and the male member (also known as the punch) is fixed to the movable side.

[0005] In a molding machine with two surfaces, the clamping unit consists of two die holder plates, which are connected to each other by a moving cylinder. The moving cylinder slides around four columns to open and close the moving surfaces; these two plates are called the fixed plate and the movable plate. In the case of a toggle mechanism, the clamping unit consists of three plates instead. The first plate is called the fixed plate and is integrated with the base. The second plate is called the die head and is not constrained to the base of the molding machine, and its role is to resist the extension of the columns by applying clamping force to the mold. The third plate is called the movable plate and is positioned between the two fixed plates, on which the punch is mounted.

[0006] The movement of such plates is provided using various systems. The movable plate must be carefully guided to ensure that the mold halves do not close in perfect parallelism. The movable surface must be guided precisely: in fact, excessive gaps between the sliding bushing and the column in the movable plate can result in a lack of the necessary perpendicularity between the column and the surface. Molding machines with a clamping system involving two surfaces have larger mold holder plates. This allows for easier and more precise guidance of the movable plate during movement.

[0007] The movable plate is supported by skids to better support the weight and surface of the mold and to avoid placing this load on the columns, and furthermore, friction between the surface and columns in horizontal type molding machines is taken into consideration. The clamping force of the molding machine is generated by the stretching applied to the columns.

[0008] Thus, it is well known that injection molding machines are equipped with columns, and generally, means for gripping such columns are provided to enable holding plates in a clamping position and withstanding the high pressure applied to half-molds. Depending on the design of the particular injection molding machine or its clamping unit, the clamping devices can be positioned at various points on the clamping unit. In a clamping unit with one fixed and one movable mold holder plate, it is a desirable implementation to fix the fixing device of the columns of the clamping unit to the movable mold holder plate.

[0009] A jaw-type clamping mechanism is also used. In this mechanism, the clamping jaw is rotatably fixed to an axis set on the outside of the column, and can move in and out of the annular groove of the column by rotational or swivel motion around the aforementioned axis.

[0010] An example of this solution is described in U.S. Patent Application Publication No. 20020086088, which describes a mold clamping device for a molding machine having a fixed mold holder plate, a movable mold holder plate, and a column for connecting the mold holder plates. A pair of gripping jaws is provided on one of the mold holder plates and can be moved transversely relative to the column to selectively engage the column itself, thereby clamping the mold holder plate using the column itself. These jaws are characterized by the presence of a transmission means that transmits the movement of a hydraulic linear motion cylinder to a rotating disc. This rotating disc is connected to a fixed retaining ring and causes transverse sliding motion of the jaws. The combined motion transmission means between the fixed retaining ring and the rotating disc is a pin and / or roller, the motion of which occurs within a cam provided on the jaw. The movement is obtained by pulling the pin inward into the cam, thereby opening and closing the pair of jaws.

[0011] Thus, the jaw clamping device described in U.S. Patent Application Publication No. 20020086088 offers several advantages over the prior art described above, but it also has the disadvantage that the direction of the pin inside the cam located on the inside of the jaw changes continuously. This solution is not optimal in terms of molding cycle time and has the disadvantage that the clamping element and associated handling parts wear out easily, requiring frequent maintenance and inspection.

[0012] Regarding the above, it is recognized that there is a need to design an engagement and clamping system in injection molding that further reduces the time required for the molding cycle while simultaneously reducing wear on the mechanical elements of the clamping system.

[0013] The applicant has confirmed that the technical challenges highlighted above can be solved by using a jaw clamping device that utilizes the rotational and translational motion of the fan-shaped portion constituting the jaw itself, thereby reducing the friction generated and the time required for each molding cycle. [Prior art documents] [Patent Documents]

[0014] [Patent Document 1] U.S. Patent Application Publication No. 2002 / 0086088 [Overview of the project]

[0015] The present invention is described and characterized in the independent claims, while the dependent claims describe other preferred but non-essential features or variations of the main solution in the present invention.

[0016] A first object of the present invention is a jaw clamping device for an injection molding machine having a fixed plate and a movable plate mounted on a base, aligned around a pressure column, the clamping device being characterized by comprising the following components: - A fixed disk fitted with a series of induction cams; - A fan-shaped jaw section with multiple bearings protruding from both ends; - A movable disk having a continuous induction cam; - A hydraulic cylinder that has the function of transmitting rotational motion to a movable disc; Here, the jaw portion can engage with or disengage from these pressurized columns as a result of rotational motion transmitted from the hydraulic cylinder to the movable disc.

[0017] The jaw device of the present invention can be easily used in an injection molding machine with two plates. This injection molding machine comprises a fixed plate and a movable plate, which are constrained to the base of the machine itself. The movable plate moves toward and away from the fixed plate through the action of a handling cylinder. Each of these two plates has a half-mold, into which molten plastic material is injected to form a desired artifact, with the contact position between the two half-molds forming the mold.

[0018] The handling cylinders for the movable plate, also known as the mold opening and closing cylinders, generally have a small cross-section. Therefore, these cylinders cannot apply the force necessary to counteract the forces that tend to open the mold during plastic material injection. Accordingly, the jaw clamping device of the present invention has the function of engaging with the pressure column once the mold is closed, thereby mechanically restraining the movable plate to the column itself.

[0019] Once engagement occurs between the jaw and the column, it restrains the movable plate to the pressure column, which is then pulled toward the fixed plate by the action of an integrated piston. This piston is located inside the fixed plate. This applies the maximum closing force to the mold, preventing it from opening under the safest conditions.

[0020] The jaw clamping device according to the present invention comprises the following basic components: a fixed disc, a fan-shaped jaw, a movable disc, and a hydraulic cylinder having the function of transmitting short rotational motion to the movable disc.

[0021] As will become clear from the detailed description of the present invention and the attached drawings, this rotational movement causes a bearing protruding from the jaw to contact a cam present on the movable disk. The fixed disk has cams with different outer shapes, which face the cams of the movable disk. The outer shape constraints that the bearing receives in the paths within the cams of the fixed and movable disks result in a rotational translational movement of the fan-shaped part of the jaw, which opens and closes the jaw.

[0022] According to a preferred embodiment of the present invention, the fan-shaped jaw preferably comprises three or four fan-shaped parts having an arc shape.

[0023] The first important advantage of the jaw clamping device of the present invention relates to the use of a hydraulic cylinder with a very short stroke, which further reduces the time required for each molding cycle compared to conventional clamping systems.

[0024] The second advantage in the jaw clamping device of the present invention relates to reducing the energy required to move the jaw during opening and closing.

[0025] The jaw clamping device is further advantageously integrated and inserted into the movable plate, ensuring better cleaning of the molding machine and better protection of the jaw system from the external environment.

[0026] The second object of the present invention is an injection molding machine comprising an injection unit and a mold clamping unit, and this mold clamping unit: - A fixed plate constrained to the base of the mold clamping unit, both aligned around a pressure column, and a movable plate sliding on the base of the mold clamping unit; - A moving cylinder for positioning the movable plate relative to the fixed plate; - A pressurizing piston integrally inserted into the fixed plate and integrated with the pressure column; and - One or more jaw clamping devices having the novel features according to the present invention, <0​

[0027] These and other advantages of the jaw clamping device according to the present invention are clearly shown in the following description of embodiments with reference to the attached figures.

[0028] Referring to the attached Figures 1 to 11, the present invention will now be described in detail, taking into account a gripping jaw consisting of three fan-shaped sections, as an example. However, the inventive concept underlying the present invention can also be extended to jaw sections having a different number of fan-shaped sections. [Brief explanation of the drawing]

[0029] [Figure 1] This is a perspective view of a mold clamping unit equipped with the jaw clamping device of the present invention, as seen from the side of the movable plate. [Figure 2] This is a perspective side view of a mold clamping unit equipped with the jaw clamping device of the present invention. [Figure 3] This is an exploded assembly diagram showing a series of components of the jaw clamping device of the present invention. [Figure 4] This is a perspective view of the clamping device of the present invention, with the jaw portion shown in the open position. [Figure 5] This is a perspective view of the clamping device of the present invention, with the jaw portion shown in the closed position. [Figure 6] This figure shows the geometric overlap of the cams present on the fixed and movable discs when the jaws are closed. [Figure 7] This diagram shows the geometric overlap of the cams present on the fixed and movable discs when the jaw section is open. [Figure 8] This is a perspective view of the clamping device of the present invention, with the jaw portion closed and engaged with the pressure column. [Figure 9] This is a perspective view of the clamping device of the present invention, with the jaw portion open and disengaged from the pressure column. [Figure 10] This is a side cross-sectional view showing details of a piston to which a pressurizing step has been applied and which is mounted integrally with the pressurizing column. [Figure 11]Figure 10 is a perspective view of the piston, showing how this piston is mounted within the fixed plate. [Modes for carrying out the invention]

[0030] The clamping unit 1 shown in Figure 1 comprises a movable plate 2 and a fixed plate 3 constrained to the base 4 of the clamping unit 1: both the movable plate 2 and the fixed plate 3 are roughly square. Each of these two plates 2 and 3 has a half-mold attached to it, so that the contact position between the two half-molds creates a mold into which molten plastic material is injected to create the desired artifact.

[0031] The movable plate 2 has four circular holes at its corners, and four columns are housed inside them. These columns are called pressure columns 5, and they apply a pressurizing process to the movable plate 2, as will be described below.

[0032] Furthermore, Figure 1 shows two small-section handling cylinders 6. These are installed diagonally to each other on the outside of the two plates: these handling cylinders 6 have the function of moving the movable plate 2, allowing the movable plate 2 to move closer to or away from the fixed plate 3 during the opening and closing cycle of the mold.

[0033] Once the mold is closed, the jaw clamping device 7 according to the present invention engages with the pressure column 5, mechanically restraining the movable plate 2 to the column 5. In this way, the jaw device 7 safely and securely restrains the movable plate 2 to the pressure column 5. Figure 1 shows the four clamping devices 7 embedded inside the movable plate 2, but only the outermost component (control flange) is visible. This will be explained below.

[0034] Figure 2 is a perspective side view of a mold clamping unit 1 equipped with the clamping device of the present invention. The fixed plate 3 is constrained to the base 4 of the mold clamping unit 1, while the movable plate 2 can be moved toward or toward the fixed plate 3 through the action of a handling cylinder 6.

[0035] The handling cylinder 6 cannot provide the force necessary to counteract the forces that tend to open the mold during the injection of the plastic material. Once engagement occurs between the fan-shaped portion of the jaw and the pressure column 5, the pressure column 5 is pulled toward the fixing plate 3 due to the action of the integrated pressure piston 8: as shown in Figure 2, each piston 8 is located inside the fixing plate 3, and its operation will be described in detail below with reference to Figures 10 and 11.

[0036] Figure 3 is an exploded view showing the components of the jaw clamping device 7 of the present invention in sequence.

[0037] Starting from the left in Figure 3, we can see the presence of a fixed disk 9 equipped with six guide cams 10, i.e., two cams for each fan-shaped portion of the jaw portion 11. The fixed disk 9 is constrained inside the movable plate 2 shown in Figures 1 and 2 and is not subject to any rotation.

[0038] In the clamping device 7, the fixing disc 9 engages with a jaw portion 11 having three arc-shaped fan-shaped portions 12. Each fan-shaped portion extends at an angle of 120°. Roller bearings 13 are present at two side ends of the jaw portion 11, and they can rotate along an axis parallel to the longitudinal axis of the jaw portion 11.

[0039] As shown in Figure 3, the roller bearing 13a protruding from the left side of the jaw portion 11 is housed in the guide cam 10 of the fixed disk 9, while the roller bearing 13b protruding from the right side of the jaw portion 11 is housed in the guide cam 15 of the movable disk 14.

[0040] In a preferred embodiment of the present invention shown in Figure 3, each fan-shaped portion 12 of the jaw portion 11 provides a total of four roller bearings 13a, 13b housed within the cams of the fixed disk 9 and the movable disk 14.

[0041] In the movable disk 14, there are six induction cams 15, which face the induction cams 10 located on the fixed disk 9.

[0042] The clamping device 7 of the present invention further comprises a hydraulic cylinder 16 having the function of moving the movable disk 14, thereby generating a short rotational motion of the movable disk 14 through the pins 17 of the movable disk. The hydraulic cylinder 16 is supported by a control flange 18 integrated with the movable plate 2 and also has the function of centering and guiding the movable disk 14. A centering band 19 is also present between the movable disk 14 and the control flange 18: it is a component that has the function of providing proper centering in positioning and assists the rotation of the movable disk 14 with a reduced coefficient of friction.

[0043] Figures 4 and 5 show the components of Figure 3 assembled to form the jaw clamping device 7 according to the present invention.

[0044] More specifically, Figure 4 is a perspective view of the clamping device 7 with the jaw portion 11 shown in the open position. The hydraulic cylinder 16 is shown in the retracted position within the slot 20 present in the control flange 18, and this position corresponds to a common separation in the three fan-shaped portions 12 of the jaw portion 11: this means that the jaw device 7 does not exert any engagement or restraining effect in the movement of the pressurizing column 5 shown in Figures 1 and 2.

[0045] Therefore, a gap 21 exists between the fan-shaped portions 12 of the jaw portion 11, and as a result, the tooth-shaped portion 22 located on the inner circular apex of the jaw portion 11 does not engage with the groove 23 (not shown in Figure 4) of the pressure column 5, thus allowing the movable plate 2 to be moved to the desired position via the handling cylinder 6.

[0046] Figure 5 is a perspective view of the clamping device 7 with the jaw portion 11 shown in the closed position. The hydraulic cylinder 16 is shown in the extended position within the slot 20 of the control flange 18. This position corresponds to the common approach of the three fan-shaped portions 12 in the jaw portion 11; this means that the toothed portion 22 of the inner circular apex of the jaw portion 11 is engaged with the groove 23 of the pressure column 5.

[0047] The gaps between the fan-shaped portions 12 of the jaw portion 11 disappear due to the close contact between the fan-shaped portions 12, while the tooth-shaped portion 22 at the inner circular apex of the jaw portion 11 can engage with the groove 23 (not shown in Figure 5) of the pressure column 5.

[0048] Figure 6 shows the overlapping geometric shapes of the guide cams on the fixed disk 9 and the movable disk 14 when the jaw is closed, while Figure 7 shows the overlapping geometric shapes of the guide cams when the jaw is open.

[0049] As explained above, the rotation of the movable disk 14 causes the roller bearing 13b in the jaw portion 11 to come into contact with the guide cam 15 present on the movable disk 14. As can be easily inferred from Figures 6 and 7, the guide cam 10 present on the fixed disk 9 has a different external shape from the cam 15 on the movable disk 14.

[0050] The external constraints present between the guide cam 10, the guide cam 15, and the roller bearings 13a and 13b result in the rotational and translational motion of the three fan-shaped portions 12 in the jaw portion 11, which in turn results in the opening, or conversely, the closing, of the clamping device 7 of the present invention.

[0051] This rotational and translational motion allows for a large displacement of the fan-shaped portion 12 in the jaw portion 11, which in turn allows for complete engagement or disengagement with the pressurizing column 5 in a very short time, as a result of the very limited stroke of the hydraulic cylinder 16 inside the slot 20.

[0052] According to a preferred embodiment of the present invention, the cams of the movable disk are all straight, while the cams of the fixed disk are half straight and half curved with a very large diameter. This prevents bearing jamming and allows for smoother and more linear motion of the system.

[0053] Figures 8 and 9 show perspective views of the clamping device 7 according to the present invention, each engaged with or disengaged from the pressure column 5.

[0054] More specifically, Figure 8 shows the hydraulic cylinder 16 in an extended position inside the slot 20 of the control flange 18, thereby bringing the three fan-shaped portions 12 of the jaw portion 11 into close contact with each other: the jaw portion 11 imposes its restraining effect on each movement of the pressure column 5. The tooth-shaped portions 22 protruding from the inner annular surface of the jaw portion 11 are fully engaged in the groove 23 along the pressure column 5, thereby completely restraining the pressure column 5 to the clamping device 7.

[0055] Figure 9 shows the hydraulic cylinder 16 in the retracted position inside the slot 20 of the control flange 18, thereby separating the three fan-shaped portions 12 in the jaw portion 11 from each other, and the jaw portion 11 does not exert a clamping force on the movement of the pressure column 5. The tooth-shaped portions 22 protruding from the inner annular surface of the jaw portion 11 do not engage with the groove 23 present along the pressure column 5, thereby allowing the pressure column 5 to move freely, while the movable plate 2 can be brought to the desired position through the use of the handling cylinder 6. In this way, the clamping device 7 is disengaged from the pressure column 5.

[0056] The opening and closing of the four clamping devices 7, as shown in Figure 1, are described above with independent movements, and a hydraulic cylinder 16 is provided to operate each individual clamping device 7.

[0057] Alternatively, the movement of the four clamping devices 7 can also be achieved by mechanically joining the mandibular and maxillary movable discs 14 by a synchronous rod 24, as shown in Figures 1 and 2. The synchronous rod 24 is integrated with the movable disc 14 via the pins 17 of the movable disc: thereby, the four clamping devices 7 can be moved simultaneously using only two hydraulic cylinders 16, for example, located on the two lower clamping devices 7. It is also possible to use a single hydraulic cylinder 16 with three synchronous rods 24, which are always integrated using the pins 17 of the movable disc, and which then integrates with the movable disc 14 to move the four clamping devices 7 simultaneously.

[0058] As described above, the handling cylinder 6 cannot provide the force necessary to counteract the force that tends to open the mold during plastic material injection. This counteracting force is ensured by the following continuous operation: A) Once the mold is closed, the jaw clamping device 7 engages with each pressure column 5, thereby mechanically restraining the movable plate 2 to the pressure columns 5; B) Once engagement occurs between the fan-shaped portion 12 of the jaw portion 11 and the pressure column 5, the pressure column 5 is pulled toward the fixing plate 2 by the action of the integrated pressure piston 8.

[0059] The sequence of actions A) and B) described above applies the maximum closing force to the mold, preventing it from opening during the molding step under the safest conditions.

[0060] Figures 10 and 11 show the structural configuration of the piston 8, which has the function of applying pressure to the handling column 5.

[0061] As shown in Figures 10 and 11, the pressurizing piston 8 is integrally attached to the pressurizing column 5. Furthermore, unlike conventional clamping units, the pressurizing column 8 in the configuration of the present invention is directly embedded in the fixing plate 3 and is not provided in a separate, specific chamber. Another advantage is that this makes it possible to realize a smaller clamping unit 1 compared to the prior art.

[0062] As shown in Figures 10 and 11, the pressurizing piston 8 can move within two cylindrical chambers. The larger chamber, called pressurizing chamber 25, is used to apply pressure to the column 5 and is filled with a suitable fluid, usually hydraulic oil, to pressurize it. This causes the pressurizing column 5 to move only a very short distance, bringing its grooves 23 into contact with the jaw portion 11 in the closed position; thereby, a pressurizing force is applied to the movable plate 2.

[0063] The smaller chamber 26 is used to displace the pressure column 5 and precisely reposition the pressure column 5 relative to the clamping device 7, thereby ensuring that the jaw portion 11 disengages from the column 5.

[0064] The precise resetting of column 5 is detected by the position transducer 27. A position transducer is present in each individual column 5. The maximum stroke achievable by the pressurizing piston 8, along with the spacing of the grooves 23 present in column 5 and the movement performed by the handling cylinder 6, allows the pressurizing force to be precisely applied to any size of mold thickness.

[0065] In summary, the jaw clamping device according to the present invention offers the following key advantages over similar jaw devices used in the prior art: A) The hydraulic cylinder 16 that moves the movable disc 14 has a very short stroke: this reduces the opening and closing time of the jaw 11 and results in less energy consumption; B) The use of the bearing 13 protruding from the jaw portion 11 significantly reduces friction. This bearing is a roller bearing, rather than a sliding bearing, as in the case of pins used in clamping devices in the prior art. C) The jaw portion 11 is integrated and inserted into the movable plate 2, thereby ensuring better cleaning of the molding machine and better protection of the jaw portion device 7 from the external environment.

[0066] The present invention is not limited to the specific embodiments described above with respect to Figures 1 to 11, but many improvements can be made in detail within the scope of the invention as defined in the appended claims, as is feasible to those skilled in the art.

Claims

1. A jaw clamping device (7) for an injection molding machine having a movable plate (2) and a fixed plate (3) attached to a base (4) and aligned around a pressure column (5), A fixed disk (9) on which a series of induction cams (10) are attached, A fan-shaped jaw portion (11) is provided with multiple bearings (13a, 13b) protruding from both ends, A movable disk (14) having a series of induction cams (15), and A hydraulic cylinder (16) having the function of transmitting rotational motion to the movable disk (14), Having the components of, The fan-shaped jaw portion (11) can engage with or disengage from the pressurizing column (5) as a result of the rotational motion transmitted from the hydraulic cylinder (16) to the movable disc (14). A jaw clamping device (7) characterized by the following.

2. The jaw clamping device (7) according to claim 1, characterized in that the movable plate (2) is moved by a handling cylinder (6) to move away from or towards the fixed plate (3).

3. The jaw clamping device (7) according to claim 1 or 2, characterized in that the rotational motion connects the bearing (13b) to the guide cam (15) of the movable disk (14).

4. The jaw clamping device (7) according to any one of claims 1 to 3, characterized in that the guide cam (10) of the fixed disk (9) has a different shape from the guide cam (15) of the movable disk (14) and is opposed to it.

5. A jaw clamping device (7) according to any one of claims 1 to 4, characterized in that the roller bearing (13a) protruding from one end of the jaw portion (11) is housed in the guide cam (10) of the fixed disk (9), while the roller bearing (13b) protruding from the other end of the jaw portion (11) is housed in the guide cam (15) of the movable disk (14).

6. The jaw clamping device (7) according to any one of claims 1 to 5, further comprising a control flange (18) joined to the movable plate (2), which centers and guides the movable disk (14) and supports the hydraulic cylinder (16).

7. The jaw clamping device (7) according to any one of claims 1 to 6, characterized in that it is integrally inserted inside the movable plate (2).

8. The jaw clamping device (7) according to any one of claims 1 to 7, characterized in that the jaw portion (11) comprises three or four arc-shaped fan-shaped portions (12).

9. The jaw clamping device (7) according to any one of claims 1 to 8, characterized in that the external constraints present between the guide cam (10), the guide cam (15), and the bearings (13a, 13b) result in rotational translational motion in the fan-shaped portion (12) of the jaw portion (11).

10. The jaw clamping device (7) according to any one of claims 1 to 9, characterized in that the pressurizing piston (8) applies an action to pull the pressurizing column (5) toward the fixing plate (3) by continuously engaging the jaw portion (11) with the pressurizing column (5).

11. An injection molding machine comprising an injection unit and a mold clamping unit (1), A fixed plate (3) is constrained to the base (4) of the clamping unit (1), and a movable plate (2) slides on the base (4), both aligned around the pressure column (5). A handling cylinder (6) moves the movable plate (2) relative to the fixed plate (3). A pressurizing piston (8) is integrated and inserted into the fixing plate (3) and joined to the pressurizing column (5). Equipped with, Herein, the mold clamping unit (1) is characterized by comprising one or more jaw clamping devices (7) as described in any one of claims 1 to 10, in an injection molding machine.

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