JPH0659651B2 - Clamp rod detachable hydraulic clamp - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a clamp rod detachable hydraulic clamp of a type in which a clamp rod can be easily attached to and detached from a hydraulic cylinder, and to enhance the clamping ability of the hydraulic clamp. This is a technology that simplifies the structure.

<Prior art> This type of hydraulic clamp is superior in that the fixed side member can be efficiently attached to and detached from the fixed side member because the hydraulic cylinder and the clamp rod can be easily separated and connected. The general structure is as follows.

For example, as shown in FIGS. 17 to 19, a transmission tool 27 is arranged above the piston 12 of the hydraulic cylinder 7, the clamp rod 6 is inserted into the piston 12 and the transmission tool 27, and the clamp rod 6 is Upper rod passive part 2
5, the transmission tool 27 is configured to be engageable, and the hydraulic pressure of the drive oil chamber provided below the piston 12 passes through the piston 12 and the transmission tool 27 in order, and then the rod passive portion 25. And the lower wall of the drive oil chamber can be pressed downward, the lower wall of the drive oil chamber is fixed to a fixed base, and the lower end of the clamp rod 6 is fixed to an object to be fixed. It was applied from the lower side.

The above structure will be described in more detail as follows.

In a state where the hydraulic cylinder 7 is viewed in the vertical direction, a clamping force interrupting device 8 is provided on the upper side of the hydraulic cylinder 7, and the piston 12 of the hydraulic cylinder 7 is provided with a rod insertion hole 14 in the vertical direction to allow the clamping force interrupting device 8 to operate. A rod insertion path D is formed vertically in the transmission tool 27, and the rod passive portion 25 at the upper end of the clamp rod 6 is inserted upward from the bottom into the rod insertion hole 14 and the rod insertion path D in order, and The transmission tool 27 is configured to be switchable between the transmission position X and the transmission cancellation position Y, and in the transmission cancellation state in which the transmission tool 27 is located at the transmission cancellation position Y, the rod insertion path D is opened and the transmission tool 27.
Is separated from the rod passive portion 25, the rod passive portion 25 can be inserted into and removed from the rod insertion passage D, and in the transmission state where the transmission tool 27 is located at the transmission position X, the rod insertion passage D is closed and the transmission tool is 27 is engaged with the rod passive portion 25 in a power-transmittable manner, and the hydraulic pushing-up force of the piston 12 is transmitted to the rod passive portion 25 via the transmission tool 27 to clamp-drive the clamp rod 6 upward. Is.

In the basic structure described above, as a structure of a portion of the clamping force connecting / disconnecting device 8 that switches the transmission 27 between the transmission X and the transmission release position Y, there is a conventional structure shown in FIGS. 17 to 19 above.

The clamp force connecting / disconnecting device 8 has a structure in which the push / pull drive device 85 pushes and pulls the sliding plate type transmission 27.

The above sliding plate type transmission 27 is formed by opening a rod insertion passage D having a Dharma hole shape in the sliding plate 79. As shown in FIG. 19 (a), in the transmission released state in which the transmission tool 27 is pulled to the transmission release position Y on the left side, the large diameter portion 80 of the dharma hole is fitted to the rod neck portion 6 b at the upper end of the clamp rod 6. Accordingly, the head-shaped rod passive portion 25 can be freely inserted into and removed from the large diameter hole portion 80. As shown in FIG. 19B, in the transmission state in which the transmission tool 27 is pushed to the transmission position X on the right side, the small diameter hole portion 81 of the dharma hole is fitted into the rod neck portion 6b, and the rod passive portion 25 Engages with the engagement wall portion 81a around the small diameter hole portion 81 so as to be engageable therewith.

The push-pull driving device 85 has a structure for performing push-pull switching operation of the sliding plate 79 via the pinion 83 and the rack 84 by the power of the pneumatic motor 82.

Further, in order to prevent an operation sequence error between the switching operation between the transmission position X and the transmission release position Y of the sliding plate 79 by the push / pull drive device 85 and the clamp / unclamp drive of the clamp rod 6 by the hydraulic cylinder 7, the clamping force is eliminated. It is necessary to control the sequence of the intermittent device 8 and the hydraulic cylinder 7 by using the sequence controller 88. When the transmission device 27 is operated to the transmission position X, the sequence control device 88 detects this by the one proximity switch 86, and sets the hydraulic cylinder 7 in a clamp driveable state via the control circuit 87. On the other hand, when the hydraulic cylinder 7 is unclamped, this is detected by the other proximity switch 86 ', and the control circuit 87
The transmission tool 27 can be switched from the transmission position X to the transmission release position Y via the.

<< Problems to be Solved by the Invention >> The above conventional structure has the following problems.

(B) The clamping capacity of the hydraulic clamp is small.

The hydraulic pressure of the hydraulic cylinder 7 is transmitted from the piston 12 to the transmission tool 27.
When the power is transmitted to the rod passive portion 25 via the, the portion of the outer peripheral portion of the small diameter hole portion 81 of the transmission 27 that communicates with the large diameter hole portion 80 becomes a non-transmissible region without a wall. Therefore, the transmission surface area of the engagement wall portion 81a is reduced, and the transmission ability of the transmission tool 27 is reduced. Therefore, the hydraulic clamp 3
The clamping capacity of is limited to a small value.

(B) The durability of the clamp rod is low.

First, since the transmission surface area of the engagement wall portion 81a is small by the amount of the non-transmission area, the surface pressure becomes high. In addition, the transmission force that should be borne by the non-transmissible region is U of the engaging wall portion 81a.
Concentrate on the letter-shaped opening 90. Therefore, the engaging wall portion 8
The U-shaped opening portion 90 of 1a and the rod passive portion 25 abutting on the U-shaped opening portion 90 have an abnormally high surface pressure, and are easily deformed or sheared.

In addition, the rod neck portion 6b of the clamp rod 6 is bent toward the non-transmissible region side because the non-transmissible region of the engagement wall portion 81a cannot bear the power transmission, and a large bending stress is generated.

As described above, the clamp rod 6 has low durability.

(C) The entire structure of the hydraulic clamp is complicated.

In order to switch the transmission tool 27 between the transmission position X and the transmission release position Y, a large-scale push-pull drive device 85 including the pneumatic motor 82, the pinion 83, and the rack 84 is required. The structure is complicated and the manufacturing cost is high.

(D) It is difficult to handle the hydraulic clamp.

Since the hydraulic clamp 3 needs the push-pull drive device 85,
The total weight is heavy. Moreover, since the push-pull drive device 85 largely projects laterally outward of the hydraulic cylinder 7, and the transmission tool 27 also moves and projects to the lateral outer side of the hydraulic cylinder 7, the lateral width of the hydraulic clamp 3 is large.

As described above, the hydraulic clamp 3 is heavy and has a large outer shape, which makes it difficult to handle.

(E) The total clamping force within a fixed installation space is small.

For example, when a large number of hydraulic clamps 3 are mounted in a fixed mounting space and used, such as a large mold for molding rubber tires, the hydraulic clamps 3 have a large lateral width, so the mounting pitch is large, and the number of mounted units is large. Less. Therefore, the total clamping force, which is the sum of the clamping forces of all the hydraulic clamps 3, is small.

The present invention increases the clamping capacity of a hydraulic clamp, enhances the durability of a clamp rod, simplifies the structure of the hydraulic clamp, facilitates the handling of the hydraulic clamp, and reduces the space required for installation within a certain mounting space. The purpose is to increase the total clamping force.

<< Means for Solving the Problems >> In order to achieve the above-mentioned object, the present invention has a hydraulic clamp configured as follows.

For example, as shown in FIG. 1 to FIG. 7, the drive oil chamber 15, the piston 12, and the transmission tool 27 are sequentially provided between one end and the other end of the clamp body 5, and the piston 12 and the transmission are transmitted. The clamp rod 6 is inserted into the tool 27 and the rod passive portion 2 at the other end of the clamp rod 6 is inserted.
5, the transmission surface 28 at the other end of the transmission 27 is engageable, and the hydraulic pressure of the drive oil chamber 15 passes through the piston 12 and the transmission 27 in order, and the rod passive The clamp body 5 is configured to be able to be pressed to one end side while pressing the part 25 to the other end side, and one end part of the clamp rod 6 is attached to one member A of the fixed side member A and the fixed side member B. In a hydraulic clamp main body with a detachable clamp rod in which the clamp main body 5 is connectable to the other member B, the transmission tool 27 is disengaged from the axial center of the clamp rod 6. The position Y and the transmission position X, which is close to the axial center of the clamp rod 6, are configured to be able to be expanded and contracted substantially uniformly in the radial direction, and the movable position X can be moved back and forth along the axial center of the clamp rod 6. The opening means 30 for expanding the diameter of the transmission member 27 from the transmission position X to the transmission release position Y is provided, and the transmission device 27 is moved from the transmission release position Y to the transmission position X. The taper cam 31 for reducing the diameter is clamped in the clamp body 5 in a state where it can be moved back and forth along the axis of the clamp rod 6.
It is provided inside.

<< Operation >> The present invention operates as follows, for example, as shown in FIG. 1 and FIG.

1 and 2, the lower end which is one end of the clamp rod 6 is fixed to the fixed member A, and the lower end which is one end of the clamp body 5 is fixed to the fixed member B. It is constructed so that it can be applied from the upper side.

When the hydraulic clamp 3 is switched from the unclamped state of FIG. 1 (a) to the clamped state of FIG. 1 (c) through the switching transition state of FIG. 1 (b), first, FIG. As shown in FIG. 3, the taper cam 31 reduces the diameter of the transmission tool 27 substantially uniformly toward the axial center of the clamp rod 6, and the transmission surface 28 formed on the upper end of the transmission tool 27 is moved to the lower surface of the rod passive portion 25. Face to face. Subsequently, as shown in FIG. 1 (c), the piston 12 pushes the rod passive portion 25 upward via the transmission tool 27 by the hydraulic pressure of the drive oil chamber 15, and the same drive operation is performed. The clamp body 5 is pressed downward by the hydraulic pressure of the oil chamber 15. As a result, the clamp body 5 and the fixed side member A are
The member B to be fixed is sandwiched and fixed between and.

When the transmission tool 27 is switched from the transmission release position Y to the transmission position X, the transmission tool 27 reduces the diameter of the clamp rod 6 substantially evenly on the axial center of the transmission surface 28 so that the transmission surface 28 extends over the entire circumference of the rod passive portion 25. Since they are arranged, the number of openings that cannot be transmitted is small, and a large transmission area can be secured. Therefore, the transmission tool 27
Of the hydraulic clamp 3 increases, and the clamping capacity of the hydraulic clamp 3 increases.

Further, as described above, since the transmission area of the transmission surface 28 of the transmission 27 is large, the surface pressure of the contact surface between the transmission 27 and the rod passive portion 25 is small. Moreover, since the transmission surface 28 is arranged substantially evenly over the entire circumference of the rod passive portion 25, stress concentration and bending stress are unlikely to occur in the clamp rod 6. Therefore, the durability of the clamp rod 6 is improved.

Further, since the transmission tool 27 can be switched between the transmission release position Y and the transmission position X by a simple structure of the opening means 30 such as a spring and the taper cam 31, the above-mentioned conventional structure (the seventeenth structure) can be used.
It is possible to omit the large-scale push-pull drive device 85 including the pneumatic motor 82, the pinion 83, and the rack 84 shown in FIG. Therefore, the entire structure of the hydraulic clamp 3 is simplified.

<< Effects of the Invention >> The present invention has the following effects.

(B) The clamping ability of the hydraulic clamp is enhanced.

Since the transmission tool can be reduced in diameter on the axial center of the clamp rod to secure a large transmission area, the transmission capability is improved. This enhances the clamping capacity of the hydraulic clamp.

(B) The durability of the clamp rod is increased.

Since the transmission area of the transmission is large, the surface pressure of the rod passive portion can be small. In addition, since the transmission surface of the transmission is arranged substantially evenly over the entire circumference of the rod passive portion, stress concentration is prevented and bending stress is unlikely to occur. In this way, since the surface pressure is small and stress concentration and bending stress are prevented from occurring, the durability of the clamp rod is enhanced.

(C) The entire structure of the hydraulic clamp is simplified.

Since a large-scale push-pull drive device can be omitted from the clamp force connection / disconnection device, the overall structure of the hydraulic clamp can be simplified and the manufacturing cost can be reduced.

(D) The hydraulic clamp is easy to handle.

Further, by omitting the large-scale push-pull drive device described above, the hydraulic clamp can be made small and lightweight, which facilitates the handling of the hydraulic clamp and improves work efficiency.

(E) The total clamping force within a fixed mounting space is increased.

Since the installation space for the hydraulic clamps is reduced due to the above-mentioned small size, when a large number of hydraulic clamps are installed and used within a fixed installation space, the installation pitch can be small and the number of hydraulic clamps to be installed increases. As a result,
The total clamping force, which is the sum of the clamping forces of all hydraulic clamps, is increased.

<< Example >> Hereinafter, the Example of this invention is described with reference to drawings.

(First Embodiment) FIGS. 1 to 7 show a first embodiment.

FIG. 2 shows an overall view, and a mold 2 which is a member B to be fixed is fixed to an upper surface of a fixing base 1 which is a member A to be fixed via a hydraulic clamp 3. The hydraulic clamp 3 includes a clamp body 5 and a clamp rod 6 that vertically penetrates a fastening hole 4 of the mold 2. The clamp rod 6 is screwed and fixed to the fixing base 1 by legs 6a.
A hydraulic cylinder 7 is provided in the lower part of the clamp body 5,
A clamp force connecting / disconnecting device 8 is provided above the hydraulic cylinder 7.

Then, first, the operator grasps the clamp body 5 by hand and inserts it into the clamp rod 6 from above. Then, a pulling force is applied to the clamp rod 6 by the hydraulic pressure of the hydraulic cylinder 7 via the clamp force connecting / disconnecting device 8. As a result, the mold 2 is pressed and fixed to the fixed base 1 by the clamp body 5.

The structure of the hydraulic clamp 3 will be described in more detail with reference to FIGS. 1 (a) to 1 (c).

First, the hydraulic cylinder 7 of the clamp body 5 will be described as follows.

This has a cylinder 9 and a cover plate 10 fixed to the upper portion of the cylinder 9 with a screw, and is constructed as a single-action spring return type. That is, the piston 2 is vertically slidably inserted in the lower portion of the cylinder 9 in an oil-tight manner. This piston 12
A guide rod 13 is provided so as to project from the lower surface side of the rod, and a rod insertion hole 14 is vertically penetrated between the piston 12 and the guide rod 13. A drive oil chamber 15 is formed below the piston 12, and a spring chamber 16 is formed above the piston 12.
Is formed. The drive oil chamber 15 is, as shown in FIG.
It is connected to a hydraulic power source (not shown) through the oil supply / drain passage 18, the connection port 19, and the hydraulic hose 20. A piston return spring 21 which is a compression coil spring is mounted in the spring chamber 16.

Further, the Kunramp rod 6 has a rod passive portion 25 formed above the insertion portion 24 which is inserted into the clamp body 5. The rod passive portion 25 has a larger diameter than the insertion portion 24.

Next, the clamp force connecting / disconnecting device 8 will be described.

This includes an upper-recessed transmission member 27 mounted on the upper surface of the piston 12, an opening means 30 arranged in the transmission member 27 for expanding the diameter of the transmission member 27, and an upper surface on the outer peripheral surface of the transmission member 27. And a taper cam 31 that abuts from the
It is constructed as shown in FIGS.

The transmission 27 is a collet 27a, 27a divided into three pieces.
The rod insertion passage D is formed of 27a and extends in the vertical direction in the inner peripheral surface thereof. Each collet 27a is configured such that it can be expanded / contracted in the radial direction of the rod insertion passage D by the guide means 33. That is, the disc-shaped guide plate 34 is placed on the peripheral portion of the upper surface of the piston 12. In addition, an annular spring receiving plate 36 is received at the mid-height portion of the lid plate 10. The piston return spring 21 is mounted between the spring receiving plate 36 and the guide plate 34, and the guide plate 34 is attached to the piston 1
It is designed to move together with the vertical movement of 2.
A guide groove 3 extending in the circumferential direction at the lower outer periphery of each collet 27a.
5 is formed, and the guide groove 35 is radially slidably fitted to the inner peripheral edge of the guide plate 34.

The opening means 30 is as follows. Transmission 2
Spring insertion holes 38, 38 extending in the tangential direction are formed facing each other in the adjacent collets 27a, 27a of 7,
The positioning pin 39 is inserted into the spring insertion holes 38. Open springs 41, which are compression coil springs, are mounted between a spring seat 40 formed by expanding the axial center portion of the positioning pin 39 and the bottom wall of each spring insertion hole 38.

Further, the taper cam 31 is formed in a tubular shape, and a cam surface 43 is formed by an inner peripheral surface whose diameter increases as it goes downward. Upper part of peripheral wall of taper cam 31 or flange 4
4 is projected outward in the radial direction, and the flange portion 44 is placed on the upper surface of the spring receiving plate 36. Further, the taper cam 31
A transmission canceling spring 47, which is a compression coil spring, is mounted between the cylindrical spring holder 46 placed on the upper surface of the cover and the upper wall of the cover plate 10. The elastic force of the transmission release spring 47 is set to be weaker than the elastic pressure of the piston return spring 21.

The unclamping state shown in FIG. 1 (a) is switched to the clamping state shown in FIG. 1 (c) by the following procedure.

As shown in FIG. 1 (a), in the state where the pressure oil is discharged from the drive oil chamber 15 and the piston 12 is lowered by the spring force of the piston return spring 21, the collet 27 a of the transmission 27 is opened by the opening means 30. The opening spring 41 expands the diameter along the guide plate 34, and the transmission 27 is switched to the transmission release position Y.
(See Figures 5 and 7). In this unclamped state,
The rod insertion passage D is opened, the diameter of the inner peripheral surface of the transmission 27 becomes larger than the outer diameter of the rod passive portion 25, and the rod passive portion 25 can be inserted into and removed from the rod insertion passage D.

Further, as shown in FIG. 1 (b), when the pressure oil is supplied to the drive oil chamber 15 to drive the piston 12 upward, the transmission drive 27 is driven by the upward drive force when driving the piston 12 upward. The outer peripheral surface of the collet 27a is pressed inward by the cam surface 43 of the taper cam 31, and the transmission 27 is opened.
Is contracted and moved along the guide plate 34 to the transmission position X (see FIGS. 4 and 6). As a result, the rod insertion passage D is closed, and a switching transition state in which the upper surface of the collet 27a of the transmission 27 faces the lower surface of the rod passive portion 25 is obtained.

Further, when the piston 12 is driven to move upward, FIG. 1 (c)
The clamp state shown in is entered. That is, with the latter-stage upward drive force of the piston 12, the transmission tool 27 is raised against the elastic force of the transmission release spring 47 while the transmission tool 27 is kept at the transmission position X, and the transmission surface 28 at the upper end of the collet 27a is moved to the rod passive portion. Abut the lower surface of 25. As a result, the hydraulic pushing force of the piston 12 is transmitted to the rod passive portion 25 via the transmission tool 27, and the clamp rod 6 is clamp-driven upward to obtain a clamped state.

On the other hand, from the clamped state shown in FIG. 1 (c) to FIG.
The switching to the unclamped state shown in (a) is performed in the reverse order of the above.

According to the above embodiment, the following advantages can be obtained. Opening means 3
0 and the taper cam 31 can switch the transmission device 27, so that the large-scale push-pull drive device 85 shown in the conventional example (see FIGS. 17 to 19) can be omitted from the clamping force interrupting device 8. In addition, since the operation order of the position switching operation of the transmission 27 and the clamp / unclamp drive operation can be discriminated by the early ascending driving force and the late ascending driving force of the piston 12, the sequence control device 88 is different from the conventional example. Can also be omitted. In this way, since the push-pull drive device 85 and the sequence control device 88 can be omitted, the overall structure of the hydraulic clamp 3 is further simplified.

8 to 10 each show a modification of the hydraulic clamp 3 described above.

The one shown in FIG. 8 is as follows.

A flange 53 is formed on the output end 52 of the slide 51 of the press mechanism that is the fixed member A, and the clamp body 5 of the hydraulic clamp 3 is provided with a plurality of bolts 54 on the upper surface of the flange 53.
Fixed by. On the other hand, the clamp rod 6 is screwed and fixed to the upper surface of the upper mold 56 which is the member B to be fixed. Then, when the upper mold 56 is attached to the slide 51, first, the slide 51 is lowered and the clamp rod 6 is placed in the clamp main body 5 that has been operated to the unclamped state.
The upper half part is inserted, and then the clamp body 5 is operated in a clamped state.

The configuration shown in FIG. 9 is as follows. The clamp body 5 is fixed to the lower surface of the fixed side member A by a plurality of bolts 54, and the clamped side member B is placed on the upper surface of the fixed side member A while the fixed side member B is placed on the upper surface of the fixed side member A. Is inserted from above, the lower half part of the clamp rod is inserted into the clamp main body 5, and the clamp main body 5 is operated in a clamped state. The clamp rod 6
Is received on the upper surface of the fixed side member B by a retaining portion 58 formed by expanding the diameter of the upper portion.

Further, in FIG. 10, a plurality of fixed side members B and B ′ mounted on the upper surface of the fixed side member A are pressed by a clamp tool 59 pivotally supported on the upper end of the clamp rod 6. is there. Reference numeral 59a is a pivot pin.

Another embodiment of FIGS. 11 to 16 is shown, and a configuration different from that of the first embodiment will be described. In addition,
Members having the same functions as those in the first embodiment are designated by the same reference numerals.

(Second Embodiment) FIG. 11 shows a second embodiment.

In this case, the cylindrical taper cam 31 is abutted from the upper surface side of the piston 12. An upwardly expanding cam surface 43 is formed in the cylindrical hole of the taper cam 31, and the lower conical transmission 27 is placed on the cam surface 43. The guide means 33 of the transmission 27 includes a guide groove 35 formed on the upper peripheral wall of the collet 27a, and a disc-shaped guide plate 34 fitted into the guide groove 35.
Consists of. The lower surface of the guide plate 34 is received by the upper surface of the spring receiving plate 36 of the piston return spring 21, and the guide plate 34 is inserted into the lower portion of the transmission release spring spring receiving member 46 placed on the upper surface of the transmitting device 27. It

(Third Embodiment) FIGS. 12 and 13 show a third embodiment, in which the guide means 3 is used.
3 is configured as follows.

A T-shaped groove 60 extending in the radial direction is formed in the lower portion of each collet 27 a of the transmission tool 27. A T block 61 which is fitted in the T-shaped groove 60 to guide and slide the transmission tool 27 in the radial direction.
Is provided. The T block 61 is fixed to the upper portion of the piston 12 with a countersunk screw 62.

The rod passive portion 25 of the clamp rod 6 is composed of a nut 63 screwed and fixed to the upper end portion of the clamp rod.

(Fourth Embodiment) FIGS. 14 and 15 show a fourth embodiment.

In this case, the guide means 33 is changed as follows.
That is, the horizontal guide pin 65 is provided in the T-shaped groove 60 of the transmission 27.
Of the horizontal guide pin 65 is screwed and fixed to the upper portion of the piston 12.

Further, the opening means 30 is configured as follows instead of the opening spring 41 described above. That is, each collet 27 of the transmission tool 27
A T-shaped groove 66 for expanding the diameter extending downward is formed on the peripheral wall of a. The head of the diameter-increasing operation pin 67 is fitted into the diameter-increasing T-shaped groove 66, and the leg portion of the diameter-increasing operation pin 67 is screwed and fixed to the collet 27a.

(Fifth Embodiment) FIG. 16 shows a fifth embodiment.

In this case, the transmission tool 27 is composed of a plurality of transmission rods 70, and the lower portion of each transmission rod 70 is rotatably supported by the upper portion of the piston 12. An annular expanding coil spring 71 is mounted in a plan view at an intermediate height portion on the inner peripheral side of the transmission rod 70, and the upper portion of the transmission rod 70 is brought into contact with the cam surface 43 of the taper cam 31 by the spring force. It And
When the piston 12 is raised, the upper portion of the transmission rod 70 is guided inward in the radial direction along the cam surface 43 and engages with the rod passive portion 25 in a transmittable manner.

[Brief description of drawings]

1 to 16 show an embodiment of the present invention. 1 to 7 show the first embodiment, FIG. 1 is an operation explanatory view, FIG. 1 (a) shows an unclamped state, and FIG. 1 (b) shows a switching transient state. Figure, Figure 1
(c) is a view showing a clamped state, FIG. 2 is an overall view of a hydraulic clamp, FIG. 3 is a perspective view of a main part, FIG. 4 is a plan view showing a transmission position of a transmission, and FIG. 5 is a transmission. Fig. 6 is a plan view showing a transmission release position of Fig. 6, Fig. 6 is a sectional view taken along the line VI-VI in Fig. 4, Fig. 7 is a sectional view taken along the line VII-VII in Fig. 5, and Fig. 8 is the above-mentioned first. It is a whole figure showing the modification of an example. FIG. 9 is an overall view showing another modification of the first embodiment. FIG. 10 is an overall view showing still another modification of the first embodiment. FIG. 11 is a view corresponding to FIG. 1 (a) showing the second embodiment. 12 and 13 show a third embodiment, FIG. 12 is a view corresponding to FIG. 1 (a), and FIG. 13 is a sectional view taken along the line XIII-XIII in FIG. 14 and 15 show a fourth embodiment, FIG. 14 is a longitudinal sectional view of a main part, and FIG. 15 is a sectional view taken along the line XV-XV of FIG. FIG. 16 is a view corresponding to FIG. 1 (a) showing the fifth embodiment. 17 to 19 show a conventional example, FIG. 17 is a vertical sectional view of a hydraulic clamp, FIG. 18 is a horizontal sectional view of a hydraulic clamp, FIG. 19 is an operation explanatory view, and FIG. 19 (a). Is a diagram showing a transmission release position, and FIG. 19 (b) is a diagram showing a transmission position. 5 ... Clamp body, 6 ... Clamp rod, 12 ...
Piston, 15 ... Drive oil chamber, 25 ... Rod passive part,
27 ... transmission tool, 28 ... transmission surface, 30 ... opening means,
31 ... Taper cam, A ... Fixed side member (fixed base), B ...
... Fixed side member (mold), X ... transmission position, Y ... transmission release position.

Claims (1)

[Claims] 1. A drive oil chamber (15), a piston (12) and a transmission (27) are provided in order between one end and the other end of a clamp body (5), and these pistons (12) and The clamp rod (6) is inserted into the transmission tool (27), and the rod passive portion (25) at the other end of the clamp rod (6) is connected to the transmission surface (28) at the other end of the transmission tool (27). ) Can be engaged, and the hydraulic pressure of the drive oil chamber (15) passes through the piston (12) and the transmission (27) in this order, and the rod passive portion (25) is connected to the other end side. The clamp body (5) and the fixed side member (A) and the fixed side member.
The clamp rod (6) is attached to one member (A) of (B).
Clamp rod detachable hydraulic clamp, in which one end of the clamp is connectable and the clamp body (5) is connectable to the other member (B). Same as the transmission release position (Y) away from the shaft center of the rod (6) Clamp rod (6)
And a transmission position (X) that approaches the shaft center of the clamp rod (6) can be expanded and contracted substantially evenly in the radial direction, and can be moved forward and backward along the shaft center of the clamp rod (6) at the transmission position (X). Then, an opening means (30) for expanding the diameter of the transmission (27) from the transmission position (X) to the transmission release position (Y) is provided, and the transmission (27) is moved to the transmission release position. A taper cam (31) for reducing the diameter from (Y) to the transmission position (X) is provided in the clamp body (5) so as to be able to move back and forth along the axis of the clamp rod (6). Clamp rod detachable hydraulic clamp characterized by: