KR910007344B1 - Clamping cylinder of extruder - Google Patents

Abstract

The clamping cylinder structure is provided for shock relaxation effect so that in the damped actuating speed by both ends. The clamping for actuating cylinder has longitudinal stringers which extend axially along cylinder tube (3) and clamping yoke which is clamped along cylinder tube. The clamping cylinder consists of upper cylinder block (1), lower cylinder block (2), cylinder tube (3) which inserted between the lower block (2) and the upper block (3), fixing rod (4) for fasterning the blocks, reciprocating piston (5) which connected to the rod (6).

Description

Clamping Cylinder Structure of Injection Molding Machine

1 is a perspective view showing the appearance of the present invention.

2 is a cross-sectional view taken along the line A-A of FIG.

Figure 3 is a perspective view of the upper cylinder block of the present invention.

Figure 4 is a perspective view of the lower cylinder block of the present invention.

5 is a cross-sectional view taken along the line B-B in FIG.

6 is a cross-sectional view taken along the line C-C of FIG.

7 is a cross-sectional view taken along the line D-D of FIG.

8 is a perspective view showing a modified embodiment of the upper cylinder block of the present invention.

9 is a sectional view taken along the line E-E of FIG.

10 is a cross-sectional view taken along the line F-F in FIG.

11 is a cross-sectional view taken along the line G-G of FIG.

* Explanation of symbols for main parts of the drawings

1: upper cylinder block 2: lower cylinder block

3: cylinder tube 4: also as fixed

4a, 4b: thread 4 ': nut

5: piston 6: piston rod

6a: thread 6b: protrusion

6c: protrusion 10: flange

10a: fastening hole 11: body

11a: screw groove 12, 21: cylinder insertion protrusion

12a, 21a, 21b, 191, 193: groove

13, 22: attenuation groove

14, 15, 23, 24: distribution hole 16: protruding end

17: sealing member insertion groove 17a, 17b: oil supply hole

18: discharge hole 18 ': fine distribution hole

20: rod ball 25: euro

26: Messe through-hole 27, 121, 197, 200: O ring

28, 122, 199, 201: Backup ring 51: Sheet part

52: Nagong 53, 194: Ring groove

54: piston ring 100, 101: valve

192: Packing groove 195: Relief groove

196: wiper insertion groove 198: U-ring

202: Wiper

The present invention relates to a clamping cylinder used in an injection molding machine, and particularly, in the case where a piston reciprocating inside a cylinder moves to both ends, a clamping cylinder which sufficiently exerts a shock-absorbing effect during operation by damping the operating speed at both ends. It's about structure.

In general, the working cylinder is coupled to the cylinder cylinder and both cylinder blocks in order to maintain the airtight in the case of the hydraulic cylinder, and the combination of the piston and the piston rod in the cylinder tube inside the working fluid access hole installed in the cylinder block on both sides It is configured to perform the abdominal movement by the working fluid supplied or discharged through.

Such a conventional working cylinder reciprocates the piston and the piston rod at a nearly constant speed according to the supply and discharge of the working fluid at the time of operation, so that the disadvantage of the heavy load at the beginning of the reciprocating operation and at the end of the reciprocating operation There is a problem that is unfavorable to other operating member that is applied to the normal operating member fixedly installed at the end of the piston rod to the associated operation.

In addition, airtightness between the piston rod and the rod hole reciprocating through the rod hole formed in the uniaxial cylinder block is a problem.

On the other hand, in order to alleviate the shock generated at the beginning or the end of the operation, a method of automatically adjusting the supply and discharge pressure of the working fluid may be adopted, rather than mechanically, but a complex control configuration having such a function is separately provided. Since it has to be prepared, there are problems in practical application and uneconomical disadvantages.

The present invention has been made to solve such a conventional problem has the following object.

It is a first object of the present invention to provide an operation cylinder structure that can mitigate or minimize impact during operation by attenuating the speed at both ends of a piston and a piston rod reciprocating in a cylinder.

The second object of the present invention is to improve the internal sealing structure in the airtightness required between the upper cylinder block and the piston rod to improve the durability of the parts for sealing with sufficient airtightness effect to greatly extend the service life. To provide a working cylinder structure that can be made.

The present invention is to provide a projecting end and a projection formed integrally with the piston rod in the front and rear of the piston fixed to the piston rod in order to embody the above object, and the lower cylinder block and the upper cylinder to the same diameter The damping groove is formed in the upper block, and the upper and lower blocks communicate with each other through the micro flow path for speed reduction, and at the same time, the airtight structure is provided as an airtight structure between the upper cylinder block and the piston rod. It provides a working cylinder structure made by installing each and forming a plurality of separate relief grooves.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the present invention includes a cylinder fitted between an upper cylinder block 1, a lower cylinder block 2, an upper cylinder block 1, and a lower cylinder block 2. As shown in FIG. A plurality of fixed rods 4 for fastening the tube 3, the upper cylinder block 1 and the lower cylinder block 2 to each other, the piston 5 and the piston 5 reciprocating inside the cylinder tube 3 Piston rod 6 is fixed to the center of the combination is made of each other.

The upper cylinder block 1 is a flange portion 10 is formed with a plurality of fastening holes (10a), as shown in Figures 1 to 3, 5 and 6, the corner portion protrudes in a round shape The main body 11 having the threaded grooves 11a respectively drilled therein and a cylinder insertion protrusion 12 having a plurality of grooves 12a formed on the outer circumference and protruding from the rear surface of the main body 11 are integrally formed. A damping groove 13 having an end portion formed therein, a protruding end portion 16 through which flow holes 14 and 15 through which working fluid flows in or out is formed, and an airtight oil supply 17a is formed on one side. Retaining member engaging groove 17, the speed-reduction micro-distribution hole (18 ') through which the discharge hole (18) drilled from the front surface of the cylinder insertion protrusion 12 is provided, respectively, the distribution hole (15) and discharge The ball 18 is intended to be connected to the valve 100.

The O-ring 121 and the backup ring 122 are inserted into the recess 12a of the cylinder insertion protrusion 12, and the airtight holding member 19 is fitted into the airtight member insertion groove 17. 19, a plurality of grooves 191 are formed on the outer circumference, respectively, and a packing groove 192, an oil supply hole 176 is formed on one side of the groove 193, a ring groove 194, and a relief groove 195. ) And the wiper insertion groove 196 are formed, respectively, but the hole (191) O ring 197, the packing groove (192) U packing (198) and the backup ring (199) ring ring (194) O ring It is made by inserting the wiper 202 into the wiper insertion groove 196 and the backup ring 201 on both sides 200 and 200, respectively.

The lower cylinder block 2 is a cylinder having a plurality of grooves 21a formed on the outer circumference of the rod hole 20 at the corners thereof, as shown in FIGS. 1, 2, 4, and 7. Insertion protrusion 21 is integrally formed, but the damping groove 22 is formed in the center, the outer periphery of the damping groove 22 is formed with a concave groove 21b formed of concentric circles, the damping groove 22 is a working fluid is The flow passage 25 is formed on the side surface and is connected to the flow holes 23 and 24 flowing in or out, and has a structure that is connected to the micro through hole 26 drilled in the recess 21b. The O ring 27 and the backup ring 28 are fitted to each other. At this time, the distribution hole 24 and the flow path 25 is installed by the valve 101.

The cylinder tube 3 has a hollow cylindrical shape as shown in Figs. 1 and 2, but both sides of the cylinder inserting protrusions 12 and 21 of the upper and lower cylinder blocks 1 and 2 as described above. Is supposed to fit.

As shown in FIGS. 1 and 2, the fixing rod 4 has threaded portions 4a and 4b formed on both sides thereof, and one side thereof is fastened and fixed to the screw groove 11a of the upper cylinder block 1. The other side is inserted through the rod hole 20 of the lower cylinder block 2 and fastened and fixed by the nut 4 'so that the upper cylinder block 1 and the cylinder tube 3, the cylinder tube 3 and the lower cylinder block are fixed. It is possible to fix (2) in close contact with each other.

As shown in FIG. 2, the piston 5 is provided with a sheet portion 51 into which the piston rod 6 described later is inserted, and a hole 52 is formed at the center thereof so that the piston rod 6 can be fixed to the piston rod 6. A plurality of ring grooves 53 are formed at the outer periphery, so that the piston rings 54 are fitted to each other so as to slide on the inner circumferential surface of the cylinder tube 3.

As shown in FIGS. 1 and 2, the piston rod 6 has a threaded portion 6a formed at one side thereof, and is screwed to the piston 5 and the damping groove 13 of the upper cylinder block 1. ) And the airtight holding member 19 and the damping groove 22 of the lower cylinder block 2 to be reciprocated, but have the same diameter as the damping groove 22 described above and the inclined end portion One side is inserted into the protruding end portion 6b of the formed side 6b and the aforementioned sheet portion 51, and the protruding portion 6c formed of the same diameter as the damping groove 13 is formed integrally.

8 to 11 show a modified embodiment of the upper cylinder block of the present invention, the flange portion 10, the main body 11 and the cylinder insertion protrusions 12 and the distribution hole 14 described above It has the same configuration as the example, but the steel groove 13 'is formed long in a straight line without the protruding end 16 in the above-described embodiment, and in the case of the airtight member 19', the number of ring grooves 194 and The number of relief grooves 195 is only a different degree, and in the case of the micro-flow holes 18 ', they have almost the same configuration as the above-described embodiment, but communicate with each other through the inner damping groove 13' and the through holes 70. It is possible to be made and to form a fastening hole 71 in the rear end of the through hole 70 is different from the point that the mudurenchi bolt 72 is fitted and the flow rate can be adjusted. At this time, the bolt 72 is integrally formed with the thread portion 73 of the upper outer periphery, the groove 75 into which the O-ring 74 is inserted, and the flow control sheet 76 at the bottom thereof to be integrally fastened to the fastening hole 71. According to the degree of fixation and tightening, the sheet 76 adjusts the opening and closing degree of the through hole 70 and adjusts the flow rate.

Reference numeral 77 as a non-explanatory symbol denotes movable ends for threading and closing fastening plugs, respectively, at the ends appearing during flow passage processing.

The present invention made as described above has the following actions and effects.

The clamping cylinder of the present invention has a mounting member such that the end of the airtight holding member 19 is in close contact with each other in order to prevent the airtight holding member 19 from moving in the longitudinal direction of the piston rod 6 in the upper cylinder block 1 when it is mounted. The mounting is preferably made by fastening the bolt through the fastening hole 10a provided in the flange portion 10.

The reciprocating motion of the piston (5) and the piston rod (6) is operated by supplying or discharging the working fluid through the distribution holes (14, 23) formed in the upper and lower cylinder blocks (1, 2). When the working fluid is supplied through the distribution hole 14 of the cylinder block 1, the piston 5 and the piston rod 6 are lowered in FIG. 1 and the protruding end portion of the piston rod 6 Just before 6b) reaches the damping groove 22, the working fluid is smoothly discharged through the distribution hole 23, so that the operation is almost constant. However, once the end of the protruding end 6b reaches the inlet of the damping groove 22, the discharge of the working fluid in the cylinder tube 3 through the damping groove 22 and the distribution hole 23 is stopped once and the protruding end ( The working fluid located in the space between the outer periphery of 6b) and the cylinder tube 3 is purely supplied to the valve 101 via the micro-pores 26 and the flow path 25 and passes through the valve 101 to the damping groove ( 22 is supplied to the outlet 22 again and discharged through the distribution hole 23, while exhibiting a sufficient damping effect, the protruding end 6b is gradually inserted into the damping groove 22, and the operation of the piston 5 is stopped.

On the contrary, when the working fluid is supplied through the distribution hole 23 of the lower cylinder block 2, the piston 5 and the piston rod 6 are raised in FIG. 1 and the projection 6c of the piston rod 6 is raised. Until just before reaching the damping groove 13, the discharge of the working fluid through the distribution hole 14 is made smoothly is almost constant speed operation. However, once the upper end of the protrusion 6c reaches the inlet of the damping groove 13, in the case of the upper cylinder block 1 shown in FIGS. 5 and 6, the damping groove 13 is shown. The working fluid which was closed by the inlet part of the protrusion 6c and discharged through the damping groove 13 and the distribution hole 14 was stopped and occupied in the space between the protrusion 6c and the cylinder tube 3. Is supplied to the valve 100 via the gas discharge hole 18 through the micro-distribution hole 181 located in the front of the cylinder insertion protrusion 12, and the damping groove 13 through the distribution hole 15 through the valve 100. ) Is supplied again to be discharged through the distribution hole (14). At this time, the discharged working fluid is discharged through the micro-distribution hole 18 ', the discharge hole 18, the valve 100, the distribution hole 15, the damping groove 13 and the distribution hole 14, so that the discharge rate is rapidly With decreasing momentary damping effect, the projecting portion 6c gradually slides into the damping groove 13 to stop the operation of the piston 5.

In the modified embodiment shown in Figs. 8 to 11, the operation is performed in a manner substantially similar to the above-described embodiment, but the working fluid opens the micro-distribution hole 18 'located in front of the cylinder insertion protrusion 12. The point through which the discharge through the damping groove 13 'and the distribution hole 14 via the through hole 70 directly is different. At this time, the bolt 72 located at the rear end of the through hole 70 may be tightened or relaxed to adjust the opening and closing degree of the sheet 76 and the through hole 70 to adjust the discharge amount of the working fluid and thus to adjust the damping rate. Will have

Next will be described with respect to the airtight holding process and its effect during the reciprocating operation of the piston rod (6) in the airtight holding member (19).

The piston rod 6 is reciprocated in a state where oil is supplied through the oil supply holes 17a and 17b. At this time, the piston rod 6 and the groove 193 form a sealed space filled with oil. It is to be formed and leaked to the outside through the outer peripheral surface of the piston rod 6 by the hydraulic fluid inside the hydraulic fluid contained in the cylinder tube (3) and the damping groove (13, 13 '), but the airtight member insertion groove (17) Leakage through the gap between the airtight and the airtight member 19 (which is rarely present) is prevented by the O-ring 197 and leaks through the gap between the piston rod 6 and the inner circumferential surface of the airtight member 19. Is prevented first and second by the U packing 198 formed in two stages, and can be prevented three times by oil filled in the recess 193. In addition, it is possible to completely prevent the external leakage of the working fluid with the oil film blocking effect by the O-ring 200 and the relief groove 195.

In particular, the U-packing 198 and the O-ring 200, the backup ring (199, 201) is fitted to one side or both sides, respectively, during the reciprocating operation of the piston rod 6 U-packing (198) or O-ring 200 It is possible to prevent the damage caused by pressurized wear and tear and excessive deformation, and can fully exhibit the proper maintenance effect.

Therefore, the clamping cylinder structure of the present invention is provided with a protruding end 6b and a protruding portion 6c which are integrally formed with the piston rod 6 at the front and the rear of the piston 5 fixedly installed at the piston rod 6, respectively. Damping grooves 22, 13 and 13 'are formed in the lower and upper cylinder blocks 2 and 1, the same as the diameters of the protruding end 66 and the protruding portion 6c, and the upper and lower cylinder blocks 1 and 2 It has a structure formed by providing a hermetic holding member 19 as an airtight structure between the upper cylinder block 1 and the piston rod 6 at the same time as forming a fine flow path for speed reduction and reciprocating motion inside the cylinder tube 3 In the piston 5 and the piston rod 6, the speed at both ends of the inner side of the cylinder tube 3 can be attenuated appropriately. Alleviate shock or external influences that may occur during It can be minimized and has an excellent effect, such as sufficient durability between the upper cylinder block 1 and the piston rod 6, and the durability of the parts for sealing can be improved to greatly extend the service life. In addition, the clamping cylinder of the present invention can be used in addition to the injection molding machine mounted on other devices in which the hydraulic cylinder is used.

Claims (2)

Upper cylinder block (1), lower cylinder block (2), cylinder tube (3) fitted between the upper cylinder block (1) and the lower cylinder block (2), upper cylinder block (1) and lower cylinder block ( A plurality of fixing rods 4 for fastening and fixing 2) to each other, a piston 5 reciprocating in the cylinder tube 3 and a piston rod 6 fixed to the center of the piston 5 are coupled to each other Although the upper cylinder block 1 has a flange portion 10 having a plurality of fastening holes 10a formed therein, a corner portion protrudes in a round shape, and the main body 11 and the main body 11 in which the screw grooves 11a are drilled, respectively ( 11) is formed integrally with the cylinder insertion protrusions 12 protruding on the rear surface and formed with a plurality of grooves (12a) on the outer circumference, the inner side of the damping groove 13, the inclined end is formed, the working fluid flows in or out Protruding end portion 16, the distribution hole 14, 15 is made to be made, one side for confidentiality The airtight holding member insertion groove 17 in which the supply hole 17a is formed, and the speed reduction micro distribution hole 18 'which are drilled from the front surface of the cylinder insertion protrusion 12 and communicate with the discharge hole 18 are provided, respectively. The distribution hole 15 and the discharge hole 18 are made to be connected to the valve 100; The O-ring 121 and the backup ring 122 are inserted into the recess 12a of the cylinder insertion protrusion 12, respectively, and the airtight holding member 19 is fitted into the airtight member insertion groove 17. The member 19 has a plurality of grooves 191 formed on the outer circumference thereof, and the grooves 193, the ring grooves 194, and the relief grooves having the packing grooves 192 and the oil supply 17b formed on one side thereof on the inner circumference. 195) and the wiper insertion groove 196 are formed, respectively, the groove 191, O-ring 197, the packing groove 192, the U packing (198) and the backup ring (199) the ring groove (194), O A ring 200 and a backup ring 201 on both sides, and a wiper 202 are inserted into the wiper insertion groove 196, respectively; The lower cylinder block 2 is formed of a cylinder insertion protrusion 21 integrally formed with a plurality of grooves 21a formed on the outer circumference of the rod hole 20 at a corner thereof, and a damping groove 22 is formed at the center thereof. The outer periphery of the damping groove 22 is formed with a concave groove 21b is formed in a concentric circle, the damping groove 22 is connected to the through-holes 23, 24 through which the working fluid flows in or out, and at the same time flow path (25) is formed and has a structure that is connected to the micro-holes 26 drilled in the groove (21b) and the groove (21a) is installed in each of the O-ring 27 and the backup ring 28, The distribution hole 24 and the flow path 25 are connected and installed by the valve 101; The fixed rod 4 has threaded portions 4a and 4b formed on both sides thereof, and one side thereof is fastened and fixed to the screw groove 11a of the upper cylinder block 1, and the other side of the rod hole 20 of the lower cylinder block 2. The upper cylinder block (1) and the cylinder tube (3), the cylinder tube (3) and the lower cylinder block (2) are tightly fixed to each other; The piston 5 is provided with a sheet portion 51 into which the piston rod 6 is inserted, and has a hole 52 formed at the center thereof so that the piston rod 6 can be fixed to the piston rod 6. Are formed so that the piston rings 54 can be fitted so as to slide on the inner circumferential surface of the cylinder tube 3; The piston rod 6 has a threaded portion 6a formed at one side thereof, and is screwed and fixed to the piston 5, and the damping groove 13 and the airtight holding member 19 and the lower cylinder block 2 of the upper cylinder block 1 are fixed. It is made to be able to perform a reciprocating motion in the damping groove 22 of the inner side, the protruding end portion (6b) of the one side formed with the same diameter as the damping groove 22, the inclined end portion 6a and the aforementioned site portion Clamping cylinder structure of the injection molding machine, characterized in that one side is inserted into the 51 and the protrusion 6c formed in the same diameter as the damping groove 13 is formed integrally. 2. The damping groove (13 ') of the upper cylinder block (1) is formed in a straight line without the protruding end portion (16') and the micro-flow hole (18 ') is formed through the through hole (70). And the through hole 70 forms a fastening hole 71 at the rear end thereof so that the bolt 72 is fitted, and the bolt 72 is inserted into the threaded portion 73 and the O-ring 74. Clamping cylinder of the injection molding machine, characterized in that the groove 75 and the lower flow rate control sheet 76 is integrally formed to adjust the flow rate of the working fluid using the bolt (72).

Images