JPH051080U - Vacuum supply unit - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide a vacuum supply unit that more accurately measures the pressure in order to grasp the pressure state of a working device such as a suction pad. In a vacuum supply unit 10 for supplying a negative pressure to a suction pad or the like from a vacuum port 70, a vacuum switch 68 for grasping a suction state or the like is directly communicated from the vacuum port 70 without a filter body 81. A passage 72 is provided. Further, by providing the check valve 79 in the passage 72, it is possible to prevent the vacuum switch 68 from being broken by the compressed air when the negative pressure is released.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is a vacuum supply unit that supplies negative pressure to work equipment such as suction pads. In more detail, it is possible to accurately measure the pressure state of the working equipment. Vacuum supply unit.

[0002]

[Prior art]

  Conventionally, a vacuum supply unit has been used as a power source for suction pads and vacuum packs. Is used. A vacuum supply unit of this type generally has a function of generating negative pressure. Actuator or vacuum pump and a vacuum port that communicates with work equipment such as a suction pad. And a valve mechanism that sends or shuts off compressed air to the ejector or vacuum port. Section, a filter section for removing dirt of air sucked from the working equipment, and the operation section. A detection unit for measuring a negative pressure applied to the industrial equipment and controlling the working equipment is provided. In this case, before The detection unit is generally provided on the downstream side of the filter unit with respect to the vacuum port. It

[0003]   The operation of the vacuum supply unit according to the related art configured as described above will be explained. Reveal

[0004]   When sucking air from the work equipment, first, compressed air is ejected through the valve mechanism. To generate negative pressure. The air drawn from the work equipment is Is sucked into the vacuum supply unit, and dirt such as dust and oil in the intake air is collected at the filter. It is removed and discharged through the passage inside the vacuum supply unit.

[0005]   At that time, the detection unit measures the negative pressure and controls the negative pressure applied to the work equipment. However, the measuring device of the detection unit may be damaged by dust in the intake air, oil, etc. There is a risk of performance degradation and malfunction. Therefore, vacuum supply from the vacuum port The air drawn into the supply unit passes through the filter section to reduce dirt such as dust and oil. After being reduced, the negative pressure of the air is measured at the detector.

[0006]

[Problems to be solved by the device]

  However, in the above-mentioned conventional technique, the work equipment is The dust in the intake air, dirt from oil, etc. causes clogging in the filter section. That Therefore, a pressure difference is generated between the upstream side and the downstream side of the filter section with respect to the vacuum port, and There is a difference between the value of the pressure measured at the outlet and the value of the pressure actually applied to the work equipment. . As a result, it is necessary to obtain a feedback signal from the detection section and try to drive accurately. Since the control of industrial equipment is not performed precisely, the transported object falls from the suction pad, the position There is an inconvenience that causes problems such as misalignment.

[0007]   The present invention solves this kind of problem, and the detector is actually installed in the vacuum port. Provide a vacuum supply unit that can accurately detect the value of the negative pressure that is occurring. The porpose is to do.

[0008]

[Means for Solving the Problems]

  In order to solve the above problems, the present invention provides a vacuum supply unit for supplying a negative pressure. And   A body having a vacuum port communicating with the work equipment,   Provided in the body in a passage that connects the negative pressure source and the vacuum port. The filtered part,   A detection unit for measuring the pressure in the vacuum port,   Furthermore, a passage is provided to directly connect the vacuum port and the detection unit. And

[0009]

[Action]

  In the above vacuum supply unit according to the present invention, the vacuum port and the detection unit are directly connected. By providing a passage to operate, the pressure can be measured by the detection unit without passing through the filter unit. Wear. Therefore, the pressure difference due to clogging of the filter part affects the measurement. It is possible to accurately measure the negative pressure generated in the vacuum port via the detection unit.

[0010]

【Example】

  A preferred embodiment of the vacuum supply unit according to the present invention will be given with reference to the accompanying drawings. A detailed description will be given below with reference to FIG.

[0011]   1 and 2, reference numeral 10 is a vacuum supply unit according to the first embodiment. Indicates a knit.

[0012]   The vacuum supply unit 10 basically includes a solenoid valve unit 12, a valve mechanism unit 14, and a manifold. Field 16, ejector 18, filter section 20, detection section 22, vacuum port section 24 Composed.

[0013]   The solenoid valve unit 12 is attached to the upper portion of the rectangular valve mechanism unit 14 by screws. Is attached, and one side surface portion of the manifold 16 abuts on one side surface portion of the valve mechanism portion 14. It is arranged so that. Air is supplied to the other side surface portion of the valve mechanism portion 14 from below. Port 26, pilot valve supply port 28, vacuum break port 30, pilot valve The exhaust port 32 is formed. Vacuum break with the pilot valve supply port 28 A screw hole is formed in the vicinity of the port 30, and the screw hole substantially constitutes a flow control valve. The valve body 34 is screwed. Inside the valve mechanism 14, the axial direction is orthogonal to the drawing. A two-port two-position type air supply valve 36 and a vacuum break valve 38 extending in the direction, The valves 36, 38, ports 26-32, solenoid valves 40, 42, 44, and manifolds. A passage connecting the holds 16 is defined.

[0014]   In addition, the pilot valve supply port 28 and the pilot of the manifold 16 described later In order to connect the air supply valve 36 and the vacuum break valve 38 from the valve supply passage 48, Check valves 45a, 45b, 47a, 47b are provided (see FIG. 5). Said The check valves 45a, 45b, 47a, 47b may be damaged by accidents such as compressors and piping. If compressed air is no longer supplied, the supply pressure is maintained and the pilot valve and The malfunction of the solenoid valve section 12 that functions as a result is prevented. In other words, it prevents the workpiece from falling. Stop and increase safety.

[0015]   Further, the air supply valve 36 communicates with a passage 54 of the manifold 16 described later. A check valve 49 is provided inside the valve mechanism unit 14. This check valve 49 When the zector 18 is not operating, the exhaust gas is the pilot valve exhaust gas of the manifold 16. Prevent backflow from the passage 52 through the ejector 18 to the air supply valve 36 (Fig. 5).

[0016]   The electromagnetic valve unit 12 installed on the valve mechanism unit 14 constitutes the valve mechanism unit 14. 5 port for ON / OFF operation of the air supply valve 36 and the vacuum break valve 38 A two-position type first solenoid valve 40, a second solenoid valve 42, and a third solenoid valve 44 (see FIG. 2). reference).

[0017]   The manifold 16 formed of a rectangular body has one side surface in contact with the valve mechanism portion 14 and the other side surface. Is in contact with the ejector 18. The inside of the manifold 16 is shown from below. Air supply passage 46, pilot valve supply passage 48, vacuum break passage A passage 50 and a pilot valve exhaust passage 52 are formed, and on the other hand, in the direction of extension of the drawing sheet. Along with the passage 54, which connects the air supply valve 36 and the ejector 18, and the vacuum break valve 38 and the rear. It has a passage 56 communicating with the vacuum port 70 described above.

[0018]   One side surface portion of the ejector 18 contacts the side surface portion of the manifold 16. . The ejector 18 is formed of a rectangular body and has a nozzle portion 58 having a predetermined diameter inside thereof. The diffuser section 60 is connected to the nozzle section 58, and the diffuser section is provided. 60 communicates with the vacuum generating section 61.

[0019]   The outer wall surface of the ejector 18 has a pilot valve exhaust passage 5 of the manifold 16. 2 has an opening 62 communicating therewith, while the diffuser portion 60 has one side It has an open box shape, and this opening has a plurality of slits 63 formed at equal intervals. Is closed by a lid member 64 having an opening, and a siren is provided between the opening 62 and the lid member 64. A support 66 and a check valve 67 are attached.

[0020]   A detector 22 and a vacuum port 24 are attached to the other side surface of the ejector 18. Has been done. The detection unit 22 has a box shape, and a vacuum switch 68 is provided inside the detection unit 22. It is provided. This vacuum switch 68 is preferably a resistive or capacitive half A negative pressure generated by the vacuum generation unit 61, which is composed of a conductor pressure sensor, is applied to a vacuum port described later. Signal is output via a passage 72 communicating with the vehicle 70, and a signal for controlling the work equipment is issued. To do. In addition, the substrate inside the detection unit 22, for example, a flexible substrate, may be Using an electronic computer or a one-chip microcomputer, Obtaining output signals, pressure setting, pressure adjustment, alarm generation and stop, ON / OFF operation Operation, hysteresis removal, mode switching, and internal status monitoring of the vacuum supply unit. Equipped with a failure prediction function and control including the operating status of the entire vacuum supply unit Is possible. Furthermore, it is possible to predict the adsorption state using fuzzy theory. . Automatically set the ON / OFF setting automatically in advance according to the program. After operation, the base pressure fluctuation is detected by another sensor and fed back to set automatically. The value may be moved to the optimum value. For example, the base pressure is set to 50% of the detection signal. In addition, a liquid crystal (color LCD) (not shown), a light emitting diode ( It is also possible to have a digital display such as an LED). On the other hand, the detection unit 22 and The interface with the vacuum port section 24 has a hydrophobic property made of a fluorine resin membrane or the like. A filter 74 as an element is attached.

[0021]   The vacuum port portion 24 has a rectangular shape, and is formed from one side surface portion on the ejector 18 side to the flexible portion. Check valve 76 formed of a material, a passage 78 communicating with the filter portion 20, and another side surface portion And a vacuum port 70 provided on the detection unit 22. It forms a passage 72 facing. Flexibility at the interface between the passage 72 and the detection unit 22 A check valve 79 made of a member is attached. The check valve 79 has a minute hole. A section 80 is provided.

[0022]   The filter unit 20 is adjacent to the detection unit 22 and is connected to the detection unit 22 and the vacuum port unit 2. Fixed to 4. Inside the filter section 20, the oil absorbing element and the water absorbing element are provided. And a filter body 81 including a water repellent element and a hydrophobic element is provided. In addition, the filter portion 20 has a stud 82 having a thread groove at the tip thereof. It is fixed to the vacuum port portion 24 at 84. Therefore, the knob 84 is screwed By doing so, the filter body 81 can be replaced.

[0023]   Further, in place of the check valves 67 and 76, a directional control valve such as the air supply valve 36 is used. Used and interlocked with the first to third solenoid valves 40, 42, 44 which are pilot valves You may give the same function.

[0024]   Next, the operation of the vacuum supply unit configured as described above will be described with reference to FIGS. This will be described with reference to FIGS. However, for the explanation of this operation, Use the vacuum supply units 10 in series to connect the ports of the valve mechanism 14 to the screws. Therefore, it will be performed when it is blocked. Therefore, compressed air supply, pilot valve Pressure for driving the motor, vacuum breaking pressure, pilot valve, and ejector 1 The exhaust from 8 is performed only through the manifold 16 in this operation description. .

[0025]   Therefore, the work device communicating with the vacuum port 70, for example, the suction pad The case of applying pressure will be described.

[0026]   First, a compressed air supply source such as a compressor (not shown) is energized to The first solenoid valve 40 is energized through the pilot valve supply passage 48 of the manifold 16. As a result, the compressed air opens the air supply valve 36. Therefore, Maniho The air supply passage 46 of the shield 16 and the ejector 18 communicate with each other so that the ejector 18 is pressurized. Compressed air is supplied. In this way, negative pressure is generated in the ejector 18 and the suction pad is emptied. Inhale the air. This negative pressure opens the check valve 76 formed of a flexible member. . That is, due to the negative pressure, the air on the vacuum port 70 side removes dust. Suction to the diffuser unit 60 via the filter unit 20, the passage 78, and the vacuum generation unit 61. To be done.

[0027]   At that time, negative pressure is applied to the passage 72 communicating from the vacuum port 70 to the detector 22. Check valve 79 opens (see FIG. 4), and the vacuum switch 68 of the detection unit 22 is turned on. The negative pressure at the port 70 is measured, and the output signal controls the working equipment.

[0028]   On the other hand, the air sucked from the vacuum port 70 to the diffuser section 60 and the nose The compressed air ejected from the nozzle portion 58 flows from the diffuser portion 60 to the cover member 64. A silencer element consisting of a filter having activated carbon after passing through the slit 63. The odor is removed with the inlet 66, and the pilot valve exhaust of the manifold 16 is performed through the opening 62. It is discharged from the passage 52.

[0029]   When the negative pressure applied to the work equipment is released, the second solenoid valve 42 is energized and the air pressure is reduced. The supply valve 36 is closed, and compressed air does not flow into the passage 54 and the ejector 18. In this state, the compressed air supply source such as a compressor (not shown) is first energized to Air passes through the pilot valve supply passage 48 of the manifold 16. With third solenoid valve 44 The vacuum break valve 38 is opened by being energized. Therefore, the manifold 16 The vacuum breaking passage 50 directly communicates with the vacuum port 70 through the passage 56, and Release the negative pressure of.

[0030]   At that time, in the passage 72 communicating from the vacuum port 70 to the detection unit 22, the air pressure is reduced. The check valve 79 is closed by this (see FIG. 3), and air enters the detection unit 22 and the Prevents the vacuum switch 68 from being destroyed by atmospheric pressure. At the same time, check valve Air slightly flows in through the hole 80 of 79, and the negative pressure state on the vacuum switch side is maintained. To release. Therefore, after the vacuum switch 68 releases the negative pressure state of the work equipment, Also keeps signaling.

[0031]   The vacuum supply unit 10 repeats a series of operations as described above. When the pressure is measured as shown in FIG. There is no sound. Further, the detection unit 22 is also provided with a filter 74 as a hydrophobic element. However, since there is almost no air flow in the passage 72, The clogging of 74 is minute. That is, the pressure applied to the work equipment is detected. The part 22 can be accurately measured.

[0032]   Next, a second embodiment will be described with reference to FIG. In this case, the same as in the first embodiment The same reference numerals are given to the constituent elements, and detailed description thereof will be omitted.

[0033]   In the present embodiment, a reduced portion 90 in which a passage cross section is reduced in a conical shape in a part of the passage 72. And a sphere 94 that abuts on the reduced portion 90 by the elastic force of the spring 92. And a small diameter passage that directly connects the upstream side and the downstream side of the reduced portion 90. The difference from the first embodiment is that the passage 96 is provided.

[0034]   Since the fluid circuit is similar to that of the first embodiment, it will be described with reference to FIG. Ejector 1 When a negative pressure is generated in 8, and a negative pressure is supplied to the working equipment from the vacuum port 70, The negative pressure causes the spherical body 94 to compress the spring 92 so that the passage 72 communicates with the detection unit 22. Let Therefore, the detection unit 22 measures the negative pressure and controls the working equipment with the output signal. Control.

[0035]   When releasing the negative pressure state of the work equipment, the sphere 94 moves forward due to the elastic force of the spring 92. The passage 72 is blocked by coming into contact with the reduced portion 90. Therefore, the vacuum port The compressed air that has reached the port 70 does not reach the detection unit 22, and the vacuum switch 68 Prevent being destroyed. At the same time, a small amount of air flows through the passage 96. Turn on to release the negative pressure condition on the vacuum switch side. In addition, the sphere 94 which is the valve body or The same applies by substituting small grooves for the surface micro-grooves of the contracted portion 90 that is the valve seat. The effect of is obtained. Therefore, the vacuum switch 68 releases the negative pressure state of the work equipment. It prevents you from continuing to give a signal even after being told.

[0036]   This embodiment also has the same effect as the first embodiment.

[0037]   The vacuum supply unit with ejector specifications has been described above. Use vacuum pump instead of ejector in vacuum supply unit Therefore, the configuration of the present invention can be adopted.

[0038]

[Effect of device]

  The vacuum supply unit according to the present invention configured as described above has the following effects. It has advantages and benefits.

[0039]   That is, by providing a passage that directly connects the detection unit and the vacuum port, The pressure can be measured by the detection unit without using the filter unit. Therefore, the filter unit The pressure difference due to the clogging of the is prevented from affecting the measurement. Also, make sure that It is optional to attach the filter, but even if it is attached The flow of air is very small, so the filter part of the detection part hardly clogs. The detection unit can accurately measure the pressure applied to the work equipment. Therefore, pressure control This has the effect of enabling more accurate control.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a first embodiment of a vacuum supply unit according to the present invention.

FIG. 2 is a perspective view of the vacuum supply unit.

FIG. 3 is an explanatory diagram showing an open state of the first embodiment of the check valve of the vacuum supply unit.

FIG. 4 is an explanatory view showing a closed state of the check valve.

FIG. 5 is an air circuit diagram for explaining a fluid passage of the vacuum supply unit according to the present invention.

FIG. 6 is a schematic view of the essential portions of a second embodiment of the vacuum supply unit according to the present invention.

[Explanation of symbols]

10 ... Vacuum supply unit 12 ... Electromagnetic valve section 14 ... Valve mechanism section 16 ... Manifold 18 ... Ejector 20 ... Filter section 22 ... Detection section 24 ... Vacuum port sections 45a, 45b, 47a, 47b, 49, 67, 76,
79 ... Check valves 54, 56, 72, 78 ... Passage

Claims (6)

[Scope of utility model registration request] 1. A vacuum supply unit for supplying a negative pressure, the body having a vacuum port communicating with working equipment,
A filter unit provided in a passage that communicates the negative pressure generation source with the vacuum port in the body; and a detection unit for measuring the pressure in the vacuum port. A vacuum supply unit, characterized in that a passage is provided which directly communicates with the detector. 2. The vacuum supply unit according to claim 1, wherein a check valve is provided on a passage that directly connects the vacuum port and the detection unit. 3. The vacuum supply unit according to claim 2, wherein the check valve has a plurality of minute holes in the main body that communicate the upstream side and the downstream side. . 4. The vacuum supply unit according to claim 1, wherein a conical reduced portion is provided on a passage that directly connects the vacuum port and the detection portion so as to be directed toward the filter portion and have a smaller cross-sectional radius. A vacuum supply unit characterized in that a spherical body is brought into contact with a wall surface of the conical reduced portion by an elastic member. 5. The vacuum supply unit according to claim 4, wherein a small-diameter passage is provided to connect the upstream side and the downstream side of the conical reduced portion. 6. The vacuum supply unit according to claim 4, wherein a minute wall surface of the conical reduced portion or a surface microgroove of a sphere is formed.