JPH0570882U - Vacuum pad - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Even if the suction function of any of a plurality of sets of vacuum pads is disturbed, other vacuum pads can function without any hindrance. A suction pad having a suction space formed by the side wall 4 and the lid portion 5, a valve box 6 fixed to the suction pad on the side opposite to the suction space, and a lid portion that is bored inside the valve box to open the lid side. A valve chamber 7 that opens and is connected to a vacuum source, a valve body 10 that is inserted into the valve chamber and is movable back and forth in the direction of the lid, and presses the valve body against a valve seat formed on the lid side of the valve chamber. In the vacuum pad including the urging means 12 for activating, a communication port 9 for communicating the valve chamber and the adsorption space is provided in the lid, and a touch pin 11 is fixedly communicated with the valve body in a direction projecting toward the lid. When the valve body is pressed through the valve seat, the communication between the valve chamber and the suction space is blocked, and the tip of the touch pin is located outside the end of the side wall, and is pushed by the urging means. The pressure is set to be larger than the force that pulls the valve body away from the valve seat by the vacuum source.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vacuum pad that sucks articles in a vacuum for lifting and conveying the articles in a factory or the like. More specifically, the present invention relates to a vacuum pad that can be adsorbed by another vacuum pad without trouble even if one of the plurality of vacuum pads connected to a set of vacuum generation source cannot adsorb.

[0002]

[Prior Art]

 Vacuum pads that are used in factories, truck terminals, etc. to vacuum-adsorb articles for hoisting and transporting articles are used in multiple sets for vacuum generation sources such as one set of vacuum pumps for economical and space reasons. It is desirable to connect the vacuum pads of the above with air piping. However, due to irregularities on the surface of the article, a space may be created between the suction space of the vacuum pad and the surface of the article, and the suction space may become atmospheric pressure, so that the article may not be able to be adsorbed. In that case, the other vacuum pads communicate with the atmospheric pressure, and the entire vacuum pad cannot be adsorbed.

In order to prevent other vacuum pads from being affected in such a case, as an example, a vacuum pad as described in JP-A-52-59475 has been proposed. Immediately, as shown in Fig. 3, when adsorption is normal, the valve body is pressed by the spring and comes into close contact with the bottom of the cylinder hole, and through the communication hole penetrating the valve body, the inside of the vacuum pad and the vacuum source are connected. Are in communication. However, when a gap is created between the suction pad for sucking the article and the surface of the article and the inside of the suction pad becomes atmospheric pressure, the valve body is pushed up, and the inside of the suction pad and the vacuum source are cut off. Only the vacuum pad that interferes with adsorption is blocked from the vacuum source, but the adsorption function of other vacuum pads is not affected. It is not described that one set of the vacuum generation source and a plurality of sets of vacuum pads are connected.

[0004]

[Problems to be solved by the device]

 Since the vacuum pad pushes up the valve element at atmospheric pressure when shutting off from the vacuum source, it takes some time between the start of rising and the start to end of rising, resulting in slow responsiveness. This could lead to a serious accident, in which the atmospheric pressure communicates with the pad and the article comes off. The structure is complicated, the weight is excessive, and it is economically disadvantageous. Further, since it is not required that one set of vacuum source and a plurality of sets of vacuum pads are connected, the economical disadvantage cannot be solved. Therefore, the present invention provides a responsive vacuum pad despite its simple structure.

[0005]

[Means for Solving the Problems]

 As means for achieving the above-mentioned object, the present invention provides a suction pad having a suction space formed by a side wall and a lid, a valve box fixed to a side of the suction pad opposite to the suction space, and an inside of the valve box. A valve chamber that is bored in the valve body and opens on the lid side and is connected to a vacuum source; a valve body that is inserted into the valve chamber and is movable back and forth in the direction of the lid section; And a biasing means for pressing against a valve seat formed on a side of the vacuum pad, wherein the lid portion is provided with a communication port for communicating the valve chamber and the suction space, and the valve body is covered with a touch pin. Part of the contact hole is fixed in a direction protruding toward the side of the valve seat, loosely penetrates the communication port, and when the valve body is pressed against the valve seat, communication between the valve chamber and the suction space is blocked, and the tip of the touch pin is connected to the side wall. Located outside of the end of the It was set to be larger than the separating force applied for a minimum of from. In addition, the valve body is formed integrally with the suction pad so as to be bendable in the direction of the lid portion, the valve body is provided with a through hole concentric with the communication port, and the touch pin having a flange-shaped head portion is penetrated. It penetrates through the hole and protrudes from the communication port, and the biasing means presses the touch pin head to press the valve body against the valve seat, and the valve body connects the adsorption space and the valve chamber. An internal communication port is provided. Further, a set of vacuum generation source and a plurality of sets of vacuum pads were connected.

[0006]

[Action]

 Since the touch pin is pressed against the valve seat by the pressing force of the urging means, even if the suction chamber becomes atmospheric pressure, it is cut off from the vacuum generation source. During use, the tip of the touch pin hits the surface of the object and the valve element separates from the valve seat, so vacuum suction is possible.

[0007]

【Example】

 Hereinafter, a vacuum pad according to the present invention will be described in detail with reference to an embodiment shown in the drawings. FIG. 1 is a cross-sectional view showing a state where the vacuum pad 1 does not perform vacuum suction, that is, a free state. The vacuum pad 1 is composed of a suction pad 2 and a valve box 6. The suction pad 2 forms a suction space 3 by the lid portion 5 and the flexible side wall 4 protruding from the entire circumference of the lid portion 5. In the illustrated example, the side wall 4 has a parachute shape to facilitate deformation. Inside the valve box 6, a valve chamber 7 in the form of a cylindrical hole is formed, which is open on the side of the lid 5. A spherical valve body 10 is inserted into the valve chamber 7 and is movable back and forth in the lid 5 side direction. An annular valve seat 8 is formed near the bottom of the valve chamber 7 on the side of the lid 5. The valve body 10 is pressed toward the cover 5 by an urging means 12 such as a compression coil spring arranged on the opposite side of the cover 5 in the valve chamber 7, and is pressed against the valve seat 8. Reference numeral 13 is an adjusting means for adjusting the pressing force of the urging means 12.

A communication port 9 that communicates the valve chamber 7 and the adsorption space 3 is formed at the center of the lid 5. When the rod-shaped touch pin 11 is fixed to the valve body 10 in the direction of projecting to the lid portion 5 side, is loosely penetrated by the communication port 9 and projects into the adsorption space 3, and the valve body 10 is pressed against the valve seat 8. Is set so that the tip end 11a of the touch pin 11 is located axially outward from the opening side end 4a of the side wall 4.

The valve chamber 7 and the vacuum generating source 15 installed outside are pneumatically connected by an air pipe 17 through a connection port 16 provided on a side wall of the valve chamber 7. During operation of the vacuum generation source 15, the valve chamber 7 has a pressure substantially close to vacuum. Therefore, a force that pulls the valve body 10 away from the valve seat 8 acts. In the present invention, the pressing force by the urging means 12 is set to be larger than the force for pulling the valve body 10 away from the valve seat 8 by the vacuum generation source 15. Therefore, the valve body 10 is not separated from the valve seat 8 by the operation of the vacuum generation source 15.

FIG. 2 is a sectional view showing a case where the article 14 is vacuum-sucked by the vacuum pad 1, that is, a usage state. When the vacuum pad 1 is applied to the surface 14a of the article 14, the touch pin tip 11a first comes into contact. When the vacuum pad 1 is pressed against the article surface 14a, the valve body 10 integrated with the touch pin 11 separates from the valve seat 8 against the pressing force of the biasing means 12, and the touch pin tip 11a hits the article surface 14a. Then, the suction pad 2 and the valve box 6 move forward with the valve body 10 integrated with the touch pin 11 left, and the side wall end 4a hits the article surface 14a. Since the side wall 4 is a flexible parachute shape, it can be easily deformed, and when the vacuum pad 1 is further pressed, the side wall end 4a comes into close contact with the article surface 14a to reliably shut off the suction space 3 from the outside air. Since the valve body 10 separates from the valve seat 8 and the communication port 9 communicates, the adsorption space 3 has a pressure close to the same vacuum as the valve chamber 7 connected to the vacuum generation source 15. Therefore, the article 14 can be vacuum-adsorbed.

If a gap is created between the side wall end 4a and the article surface 14a for some reason and the suction space 3 becomes atmospheric pressure, air also flows into the valve chamber 7 from the communication port 9, The force acting in the direction of pulling the valve body 10 away from the valve seat 8 disappears due to the pressure close to the true sky, and the valve body 10 is immediately brought into close contact with the valve seat 8 by the pressing force of the urging means 12, and the valve chamber 7 The inside is shut off from the atmospheric pressure, and the side wall end 4a is separated from the article surface 14a by the advance of the touch pin 11. Since the close contact with the valve seat 8 is performed by the pressing force of the biasing means 12, the shutoff response is very good. When the inside of the valve chamber 7 is shut off, the vacuum generation source 15 is also shut off from the inside of the adsorption space 3. If the pressing force of the urging means 12 is set to be large, the responsiveness can be made faster.

FIG. 3 is a sectional view showing a free state in another embodiment. The valve body 100 of the vacuum pad 200 has a disk shape with a thickened central portion and is formed integrally with the side wall 40 of the suction pad 20 on the side opposite to the suction space 3 of the lid portion 50. A gap space 21 is formed between the two and is bendable in the direction of the lid 50. The touch pin 110 is the same as the touch pin 11 except that a flange-shaped touch pin head 111 is formed on the head. The valve body 100 is provided with a through-hole 101 penetrating the touch pin 110 at a position concentric with the communication port 9, and the vicinity of the top of the through-hole 101 is enlarged in diameter to form a stepped cross section with which the touch pin head 111 can abut. A seat 102 is formed. The valve body 100 is provided with an inner communication port 61 for communicating the valve chamber 7 and the clearance space 21 at a position different from the through hole 101. The valve box 60 is similar to the valve box 6 except for the structure in which it is fixed to the suction pad 20.

The touch pin 110 is not fixed to the valve body 100, penetrates the through hole 101, and abuts the flange 102 of the touch pin head 111 on the seat 102. A substantially hemispherical valve surface 103 is formed on the lower surface of the valve body 100. An annular valve seat 80 is formed near the outer periphery of the communication port 9 of the lid 50. The biasing means 12 presses the touch pin head portion 111. The valve body 100 is pressed by the touch pin head 111 to bend toward the lid 50 side, presses the valve seat 80 with the valve surface 103, and adsorbs the space 3 and the clearance space 21, and further the valve chamber 7 through the inner communication port 61. Cut off communication with. In this state, the tip 112 of the touch pin 110 is located outside the opening-side end 4a, as in the case of the touch pin 11. Therefore, when the vacuum pad 200 is applied to the article surface 14a, it functions exactly as in the case of the vacuum pad 1.

FIG. 4 is an explanatory view showing a state in which one set of vacuum generation sources 15 is connected to a plurality of sets of other vacuum pads 1 by an air pipe 17. If any one of the vacuum pads 1 interferes with suction, the inside of the valve chamber 7 of the vacuum pad 1 is shut off from the suction space 3 at atmospheric pressure as described above. Since air does not flow into the remaining vacuum pad 1 connected by the pipe 17, the remaining vacuum pad 1 can continue to adsorb without any trouble.

[0015]

[Effect of the device]

 The pressing force that presses the valve body against the valve seat by the urging means is set to be larger than the force that pulls the valve body away from the valve seat due to the pressure generated by the vacuum generation source. I never leave my seat. When the vacuum pad is pressed against the article surface, the valve element separates from the valve seat against the pressing force of the biasing means via the touch pin, the suction space becomes the same pressure as the valve chamber and the vacuum generation source, and vacuum suction does not occur. It will be possible. When the adsorption space communicates with the atmospheric pressure, the pressure of the urging means shuts off the valve chamber, so the shutoff response is extremely good. By setting the pressing force by the biasing means to be large, it is possible to achieve quicker response.

Further, since a plurality of sets of vacuum pads are connected to a set of vacuum generation sources, even if any of the vacuum pads has a problem in adsorption, only the vacuum pads are disconnected from the vacuum generation source and the remaining The vacuum pad can absorb without any trouble.

[Brief description of drawings]

FIG. 1 is a sectional view of a vacuum pad according to the present invention in a free state.

FIG. 2 is a sectional view of the vacuum pad according to the present invention in use.

FIG. 3 is a sectional view of a vacuum pad according to another embodiment of the present invention in a free state.

FIG. 4 is a laterally long explanatory view showing a state in which a plurality of sets of vacuum pads according to the present invention are connected to a set of vacuum generation sources.

[Explanation of symbols]

 1,200 Vacuum pad 2,20 Adsorption pad 3 Adsorption space 4 Side wall 4a Side wall end 5,50 Lid 6,6 Valve box 7 Valve chamber 8,80 Valve seat 9 Communication port 10,100 Valve body 11,110 Touch pin 11a , 112 touch pin tip 12 urging means 14 article 15 vacuum source 61 inner communication port 101 through hole 111 touch pin head

Claims (3)

[Scope of utility model registration request] 1. A suction pad having a suction space formed by a side wall and a lid, a valve box fixed to a side opposite to the suction space of the suction pad, and a lid side formed inside the valve box. A valve chamber that is opened and connected to a vacuum source, a valve body that is inserted into the valve chamber and is movable back and forth in the direction of the lid, and the valve body is a valve seat formed on the lid side of the valve chamber. In a vacuum pad comprising a pressing means for pressing, a communication port that connects the valve chamber and the suction space is provided in the lid, and a touch pin is fixed to the valve body in a direction projecting toward the lid. Then, through the communication port, when the valve body is pressed against the valve seat, the communication between the valve chamber and the adsorption space is blocked, and the tip of the touch pin is located outside the end of the side wall. The pressing force by the urging means is larger than the force that pulls the valve body away from the valve seat by the vacuum generation source. A vacuum pad characterized by being set. 2. The touch pin, wherein the valve body is integrally formed with the suction pad to be bendable toward a lid portion, a through hole is provided in the valve body concentrically with the communication port, and a flange-shaped head is formed. Through the through hole to project from the communication port, and the biasing means presses the touch pin head to press the valve body against the valve seat, and the valve body has the suction space and the valve chamber. The vacuum pad according to claim 1, further comprising an inner communication port that communicates with each other. 3. A set of vacuum generation sources and a plurality of sets of vacuum pads are connected to each other, wherein:
Vacuum pad as described.