JPH11228100A - Air balancer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform an operation for a work itself and fine control with an inexpensive and small structure by incorporating and supporting a load sensor block by a guide, a stopper and automatic adjusting screw to be slightly slid in axial direction. SOLUTION: The inner and outer peripheries of a diaphragm piston 6 are respectively fixed to a stopper 3 and a sensor block, a valve rod 12 is moved up and down based on the relative displacement of the diaphragm piston 6 in an axial direction, and air exhaustion and discharging are performed for a detection chamber 5 from a valve seats 13 and 14. Then, a diaphragm piston 21 is operated by a pressure reducing valve 40 equipped with a relief valve incorporated in the sensor block based on a difference in pressure between a pilot chamber 16 and an operation chamber 17, an air supplying and discharging are performed for the operation chamber 17 by a valve rod 18 from valve seats 19 and 20. When a load is applied on a hook 11, an air cylinder main body is lowered by the set pressure of the pressure reducing valve 40 equipped with the relief valve to close the valve seat 12 and open the valve seat 14, and when the inside of the air cylinder is pressurized through a supply/exhaust port 32 and a pipe route 42 and a shuttle valve 50, the valve seat 14 is closed to complete a balanced state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[Industrial application field] A field in which pneumatic pressure can be used as an auxiliary force when a heavy object is moved with high precision in an assembly operation.

2. Description of the Related Art 1. Load transfer device-Japanese Patent Application Laid-Open No. 3-166200. 2. Balance lifting device for automatic weight sensing
700.

[0003] An inexpensive, compact, and delicate controllable air balancer capable of performing automatic load detection and operating the work itself by one-touch operation is provided. .

[Means for Solving the Problems] 1. A load sensor block 4 having a diaphragm piston 6 having the same area as a piston 5 of an air cylinder is provided on a head side of the air cylinder by a guide 2, a stopper 3, and a dead weight. A slight amount (± 3 mm
The load sensor block 4 is supported so as to be slidable, so that the air cylinder body can move a little by the amount described above. The movement of the cylinder body automatically detects the load. 2. A pressure reducing valve with relief is incorporated in the load sensor block 4.

[Operation] The operation will be described with reference to the drawings. FIG. 1 is a sectional view of the air balancer of the present invention, and FIG. 2 is an air circuit diagram for the air balancer of the present invention. In FIG. 1, the sensor block 4 is supported by an upper support member (not shown). Supply / exhaust ports 31, 32, 33, 34,
35 are conduits 41, 42, 43, 44,
45. A rotary joint 9, a wire 10, and a hook 11 are attached to the tip of the piston rod 8. The diaphragm piston 6 has an inner periphery fixed to the stopper 3 and an outer periphery fixed to the sensor block 4. The axial displacement of the diaphragm piston 6 in the axial direction causes the valve stem 1 to move.
2 is moved up and down to supply and exhaust the detection chamber 15 from the valve seats 13 and 14. Next, the pressure reducing valve with relief incorporated in the sensor block 4 operates the diaphragm piston 21 by the differential pressure between the pilot chamber 16 and the operation chamber 17, and the valve rod 18
Thus, the operation chamber 17 is supplied and exhausted from the valve seats 19 and 20.
Next, the entire operation will be described. The set pressure of the pressure reducing valve with relief 40 in FIG. 2 is adjusted to a no-load state (the weight of the piston 5, the piston rod 8, the rotary joint 9, the wire 10, and the hook 11). This state is a no-load balance state, and the hook 11 can be moved up and down lightly. Next, a load (heavy object) is applied to the hook 11, and FIG.
When the push button valve 46 is pressed, the relay valve 47 is set to the air supply side, and air is supplied to the air supply / exhaust port 33 from the pipe 43.
At this time, due to the set pressure of the pressure reducing valve 40 with relief, the air cylinder main body is lowered, the valve seat 12 is closed and the valve seat 14 is open. The air flowing into the detection chamber 15 from the valve seat 14 is supplied to the air supply / exhaust port 34, the pipe 44, and the pilot check valve 3.
7, 48, the pipe 45, and the supply / exhaust port 35, flow into the pilot chamber 16. At this time, the air operation valve 49 is on the air supply side. When the flow into the pilot chamber 16 continues, the valve seat 20 opens, the operation chamber 17 is supplied with air, and the supply / exhaust port 3 is further supplied.
2. When the inside of the air cylinder is pressurized through the pipeline 42, the shuttle valve 50, and the air supply / exhaust port 31 and enters a balanced state at the time of loading, the valve seat 14 closes and the balanced state is completed. 7 has been adjusted. Next, after the balance state is established, the throttle 51 and the air tank 52
, The air operation valve 49 is in the exhaust state, the pilot check valves 47 and 48 are in the closed state, and the pressure in the balanced state is sealed in the pilot chamber 16. When the load (heavy load) is raised and lowered in this state, the load is supplied and exhausted from the valve seats 19 and 20, and the load can be moved up and down in a balanced state. Next, when the load is fixed at a predetermined position (for example, lowered to the ground) and the push button valve 53 is pressed, the air is exhausted from the relay valve 47, and the pilot chamber 16 and the detection chamber 1 are discharged through the check valves 54 and 55.
5 is evacuated, and then the operation room 17 and the conduit 42 are evacuated. In this state, the air in the air cylinder passes through the shuttle valve 50 and is exhausted up to the set pressure of the pressure-reducing valve 40 with relief, so that a no-load balance state is established. Here, work such as removing the hook is performed. All of the above operations are performed by one-touch operations of the push button valves 46 and 53 only. Next, when a load is applied in the direction in which the piston rod comes out by a link mechanism or the like, the sensor block 4 has a structure shown in FIG.
To the area of the exit side of

[Example] As a result of performing the test under the following conditions, a smooth operation was confirmed with an operating force under load of 3 kgf or less. Air cylinder inner diameter 80mm, stroke 8
00 mm, inner diameter of valve seats 13 and 14 6 mm,
Inner diameter 6 mm, the support form the trunnion support, the maximum air cylinder pressure 5 kgf / ^cm 2 of the valve seat 19, 20,

[Effects of the Invention] The effects of the present invention are the following two points. 1. A balance state can be obtained by one-touch operation of a push button valve or the like. 2. Since there is no pipe to the movable part that moves up and down, integrated miniaturization is possible.

[Brief description of the drawings]

FIG. 1 is a sectional view of the present invention.

FIG. 2 is an air piping diagram used in the present invention.

[Explanation of symbols]

 1 is a head cover. 2 is a guide. 3 is a stopper. 4 is a sensor block. 5 is a piston. 6 is a diaphragm piston. 7 is a spring. 8 is a piston rod. 9 is a rotary joint. 10 is a wire. 11 is a hook. 12 and 18 are valve stems. 13, 14, 19 and 20 are valve seats. 15 is a detection chamber. 16 is a pilot room. 17 is an operation room. 21 is a diaphragm piston. 31, 32, 33, 34 and 35 are piping connection ports. 41, 42, 43, 44 and 45 are connection pipes. 40 is a pressure reducing valve with relief. 46 and 53 are push button switches. 47 is a relay valve. 37 and 48 are pilot check valves. 49 is an air operated valve. 50 is a shuttle valve. 51 is the aperture. 52 is a tank. 54 and 55 are check valves.

Claims (2)

[Claims] An axial guide (2) and a stopper (3) are fixed to a head cover (1) of an air cylinder, and a load sensor block (4) moved between the head cover and the stopper by being guided by the guide. And an air balancer for supporting and using the sensor block. 2. The air balancer according to claim 1, wherein a pressure reducing valve with relief is incorporated in the load sensor block (4).