JP2574469Y2 - Linear actuator with brake device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear actuator having a brake device for stopping a slide table, which is used for operating an operating member of various machines.

[0002]

2. Description of the Related Art The present applicant has a slide table reciprocating on a cylinder tube (cylinder body) and a brake device for stopping the slide table. Both ends of a brake plate disposed in the axial direction are provided. A brake shoe, which is fixed to the cylinder tube and presses the brake plate, and an operating part for operating the brake shoe by supplying and discharging the pressurized fluid are attached to the slide table, and an axial flow path is provided in the cylinder tube. A tube for supplying and discharging pressure fluid is disposed along the axial direction of the cylinder body, one end of the tube is connected to the slider, and the other end of the tube is provided with an air supply piston that slides tightly in the flow path. A patent application (Japanese Patent Application No. 3-50508) was filed for a linear motion actuator with a brake device. Also the length of the base
The cylinder hole and the fluid flow path are arranged side by side
And a longitudinally extending slit at the top of the fluid flow path.
And each slit is closed individually with a flexible band
And the port block body is slidably mounted on the base
Rodless for moving the port block body
Use a cylinder hole as the cylinder
Fluid supply channel using a fluid flow path as the fluid supply path to the
A feeding device (see Japanese Utility Model Laid-Open No. 2-143504) is known.
ing. In this fluid supply device, the port block
Connect the upper part of the port guide to the two grooves on the body, and
Pass the narrow part of the guide through the slit
Is fixed to the guide cover with a semi-circular cross section.
Guide cover slidable in the upper half of the fluid flow path
And a passage is provided in the port guide and guide cover.
Tei Ru.

[0003] The conventional undisclosed linear motion a with brake device
In the actuator , as described above, an axial flow path is provided in the cylinder tube, and a tube for supplying and discharging pressure fluid along the axial direction of the cylinder tube is disposed in the flow path, and one end of the tube is connected to a slide table. Connected to
The other end of the tube is fitted with an air supply piston that slides tightly into the flow path. Therefore, a flow path for arranging the tube is required, and the tube and the air supply piston slide in the flow path, so that there is a disadvantage that friction occurs. Further, since the tube also passes through the inside of the end plate, the flow passage becomes long, and it takes a long time for air to reach the brake device of the rodless cylinder after operating the directional control valve for air supply. Was. In the above fluid supply device
, Arrange the seal packing under the guide cover,
Seal packing between the inner surface of the fluid flow path and the band
Is trying to seal, but the guide cover is
Connected to the port block via the
Maintain a constant distance between the inner surface of the body channel and the guide cover
It is difficult to achieve
It was not enough.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a linear motion actuator with a brake device, wherein the length of the air supply passage from the directional control valve to the brake device for air supply is short, and The time during which air is supplied from the operation to the brake device is short, and the
It is an object to reduce leakage of air from a passage .

[0005]

This invention SUMMARY OF THE INVENTION In order to achieve the above objects, the slide table is slidably held on the track rail, both ends raceway base ends of the inserted through the brake plate in the slide table In a linear motion actuator with a brake device, which is fixed to a section and has a brake device for clamping a brake plate on a slide table, an upper slit extending in a longitudinal direction is provided on a guide member provided on a track base.
And the air passage at the center are formed, and the slide table
Coupled port block is linearly movably supported by the guide members on hand, the strip above and below the slits are arranged, narrow portion of the central portion slit port guides the guide member is inserted into, Port guide has upper and lower ends
Connected to port block and slide block respectively
The lower part of the port guide and the slide block
A reciprocatingly arranged in the flow path,
Annular packing and wear ring are provided on the outer periphery of both ends.
Outside of both ends of the slide block with annular packing
The gap between the circumference and the inner surface of the air flow path is sealed, and the slide block
The passage formed in the block is the air passage of the slide block,
Port guide air passage and port block air passage
Through the brake device . A head cover is continuously provided at both ends of the way, and both ends of the brake plate can be fixed and connected to the head cover. A rodless cylinder, a motor, a ball screw, and a linear motion actuator for moving the slide table. Nuts can be used.

[0006]

[Operation] Through an air passage of a port guide and a passage communicated with a brake device and an air passage in a guide member,
When the air for releasing the brake device is supplied to the brake device, the brake is released and the slide table becomes movable. When the slide table is moved, a port guide connected to the slide table via a port block is moved together with the slide table. When the air for releasing the brake device is discharged and the air for brake lock is supplied through another air supply path as needed, a braking force is generated and the slide table stops.

[0007]

EXAMPLES with reference to FIGS. 1 to 5, will be described linear actuator with a brake device to a first embodiment of the present invention.
FIG. 1 shows a linear actuator with a brake device according to a first embodiment .
A longitudinal sectional front view of the data (the longitudinal appropriately in order to clearly show the main part.), The left half shows a state in which the brake device is locked, the right half shows the state of the brake system is opened. 2 is a partial cross-sectional view of the side view of FIG. 1, and FIG. 3 is a partial cross-sectional view of the air supply device. FIG. 4 is an enlarged view of a main part (air supply device) of FIG. 1, and FIG. 5 is an enlarged view of a main part of FIG. First head covers 4 on both ends of way 1
And a second head cover 5 are connected to each other, and a slide base of the slide table 2 is provided on the track base 1 via guides 6 and 7.
29 is slidably supported. Directly moves into lateral groove 23 of way 1
Rodless cylinder tube as actuator
24 are arranged, and both ends of the tube 24 are connected to the first head cover 4.
And is fixed to the second head cover 5. The external mover 3 is slidably fitted to the outer peripheral surface of the tube 24 of the rodless cylinder, and two yokes 35 and 36 are mounted on the tube 24 at positions before and after the external mover 3. Two yokes
The upper ends of the slides 35 and 36 are fixed to the lower surface of the slide base 29, and the linear movement of the external mover 3 is transmitted to the slide base 29 and the slide table 2 via the two yokes 35 and 36.

Next, the brake device will be described. Center plate 28, table 27 on top of slide base 29
Air chambers (upper air chamber 25 and lower air chamber 26) are formed between the table 27 and the center plate 28, and the brake chambers 10, 11 (2 chambers each, 4 chambers in total) are formed. A slide base 29, a center plate 28, and a table 27 connected in series are referred to as a slide table 2. The brake plates 8 and 9 are used as brake chambers 10 and 11 of the slide table 2.
And the brake plate passage 32 between the center plate 28 and the slide base 29 is inserted and disposed above the track base 1. One end (left end in FIG. 2) of each of the brake plates 8 and 9 is pulled by a tension bolt 71 and a lock nut 70, and is fixed to a brake plate mounting base 72 by bolts 80.
The other end (right end in FIG. 2) of 9 is also fixed in the same manner as the one end. In the brake chambers 10, 11, a pair of brake shoes 12, 13, 14, 15 are disposed above and below the brake plates 8, 9, respectively. The upper brake shoes 12, 14 are mounted on brake holders 16, 17, respectively. The lower brake shoes 13, 15 are fixed to the bottom surfaces of the brake chambers 10, 11, respectively. The lower portions of the brake holders 16 and 17 are slidably and airtightly fitted into the recesses of the slide table 2, and the brake holders
Spring holders 18 and 19 at the top of 16 and 17 are tables 27
Are slidably fitted in the recesses 20 and 21, respectively, so that the brake holders 16 and 17 do not shift or wobble. The outer peripheral portion of the diaphragm device 22 disposed in the air chamber is sandwiched between a table 27 and a center plate 28,
The holes of the diaphragm device 22 are fitted into the lower portions of the flanges 33, 34 on the upper portions of the brake holders 16, 17, and the space therebetween is sealed. The air chamber is moved to the upper air chamber 25 by the diaphragm device 22.
And a lower air chamber 26. Brake holder-16,
An annular groove is formed in the upper surface of the spring 17, and springs 30 and 31 are inserted into the annular groove. The upper ends of the springs 30 and 31 come into contact with the upper surface of the upper air chamber 25, and a downward elastic force is applied to the diaphragm device 22. Add. Thus, a brake device is configured.

Next, an air supply device 40 for supplying air to the brake device will be described. The air supply device 40 is disposed at a position on the side of the tube 24 at the upper part of the track base 1.
The guide member 41 is fixed to the upper part of the way 1.
End blocks 42 and 43 are connected to both ends of the head cover so as to maintain an airtight state.
And 5. A port block 44 is supported on the track base 1 by a guide roller 45 so as to be linearly movable. The port block 44 is connected to the slide base 29 via a port cover 46. An air channel 47 having a circular cross section is formed at the center of the guide member 41, and a slit 48 extending in the longitudinal direction with a predetermined width is formed at an upper portion of the air channel 47,
It can communicate with the outside through the slit 48. slit
The lower and upper surfaces of 48 are sealed by flexible upper and lower strips 50 and 49, and both ends of the upper and lower strips 50 and 49 are fixed to end blocks 42 and 43. Due to the pressure of the air acting on the lower surface of the lower band 49, the lower band 49 is pressed into the groove below the slit 48 to prevent the air in the air flow path 47 from leaking. The upper band 50 is considerably wider than the slit 48, and the wide upper band 50 widely covers the upper surface of the slit 48 to form a slit for foreign matter.
Prevent entry into 48. The upper portion of the port guide 52 is inserted and connected to the concave groove 51 of the port block 44, and an end cover 53, a scraper 54, and a backup plate 55 are connected to both ends of the concave groove 51. As clearly shown in FIG. 4, a narrow portion at the center of the port guide 52 is inserted through the slit 48,
In the air passage 47, a slide block 56 is connected to a lower end of the port guide 52. The combined body of the port guide 52 and the slide block 56 moves in the air passage 47 as the slide table 2 moves. Slide block 56
Wear ring 57, annular packing 58, cover on both ends of
59 is disposed, slide by means of an annular packing 58 blocks
Outer periphery air passage inner surface of the wear ring 57 at both ends of the click 56 and
Is sealed. Penetration path 60 becomes slide block 56
The both ends of the through passage 60 are formed so as to communicate with the air flow path 47 through the holes of the cover 59. The air passage 47 is connected to the end block 42 (4
3) The supply port 68 is connected to an air pressure source (not shown) through a direction control valve (not shown). The slide block 56, the port guide 52, the port block 44, the port cover 46 and the slide table 2 have air passages 61, 62, 63, 64 and
65 are respectively formed, and the through-path 60 is provided with the air passages 61, 62, 6
It communicates with the lower air chamber 26 via 3, 64 and 65. Figure 5
As shown in the figure, a guide roller 66 and a coupler 67 are provided in the concave portion above the port guide 52, and the upper band-shaped body 50 is placed in the space above the port guide 52 and the guide roller 66 in the concave groove 51 of the port block 44. It is inserted. The lower band 49 is inserted into a space surrounded by the port guide 52 and the slide block 56. The airtight state is also maintained by the insertion of the upper and lower strips 50 and 49. A seal guide 79 is connected to both ends of the port guide 52, and an air passage 69 is provided along the air supply device 40 of the track base 1.

[0010] Air is supplied to the air supply port 68, the air flow path 47, and the through passage.
60, lower air chamber through air passages 61, 62, 63, 64 and 65
When the air flows into the upper air chamber 25 and the air in the upper air chamber 25 is appropriately discharged, the diaphragm device 22 moves upward against the resiliency of the springs 30 and 31, and the brake is released as shown in the right half of FIG. Become. When the rodless cylinder is operated at the same time as or after the supply of air to the lower air chamber 26, the slide table 2 moves on the track base 1 and the port block 44 (integrated with the combined port guide 52 and slide block 56) is moved. When the movement of the slide table 2 moving on the guide member 41 is stopped, the operation of the rodless cylinder is stopped and the air in the lower air chamber 26 is discharged. The spring force of the springs 30 and 31 allows the brake holder 16
17 moves downward, and the brake plates 8 and 9 are pressed by the pair of brake shoes 12, 13, 14 and 15 (being pinched by a strong force) to generate a braking force, and the slide table 2 stops. 1 is in the locked state of the brake shown in the left half.
In this state, the elasticity of the springs 30 and 31 is used for the brake operation (exhaust brake).
It can also be activated by supplying air to the upper air chamber 25 (pressure brake).

[0011] Figure 6, with reference to FIG. 7, described linear actuator with a brake device to a second embodiment of the present invention. The second embodiment of the present invention is characterized in that a motor (servo motor, stepping motor) as a linear motion actuator is used for driving the slide table 2. A ball screw 74 is provided in the lateral groove 23 of the track base 1, and both ends of the ball screw 74 are connected to the first head cover 4 and the second head cover 4.
The head cover 5 is supported via a bearing 75. The motor 77 is fixed to the outer surface (the left surface in FIG. 7) of the first head cover 4, and the rotation of the output shaft of the motor 77 is transmitted to the ball screw 74 via the key 76. Ball screw 74
Are screwed into the nut 78, and two yokes 35 and 36 are connected to the side surface of the nut 78 at positions before and after the nut 78. The upper ends of the two yokes 35 and 36 are fixed to the lower surface of the slide base 29, and the rotational movement of the motor 77 is converted into linear movement by the ball screw 74 and the nut 78, and the linear movement is performed via the two yokes 35 and 36. The information is transmitted to the slide base 29 and the slide table 2. The rest of the configuration of the second embodiment is the same as that of the first embodiment, and the same portions as those of the first embodiment are denoted by the same reference numerals in FIGS. 6 and 7, and the description thereof is omitted. .

[0012]

[Effects of the Invention] In the present invention, a direct acting actuator with a brake device is used.
In the estimator, the guide member arranged on the way
Is the upper slit extending in the longitudinal direction and the air passage in the center
: It is formed, linked port block to the slide table is linearly movably supported by the guide members on hand, Po
The port guide has a port block at the top and bottom
Connected to the port guide and slide block.
And a slide block are reciprocally arranged in the air flow path.
And the slide path formed in the slide block
Air passage of port lock, air passage of port guide and port
The brake device is connected to the brake device via an air passage of a heat block . Therefore, the length of the air supply passage from the directional control valve to the brake device for supplying air is short, and the time during which air is supplied to the brake device from the operation of the directional control valve is short. In the present invention,
The lower part of the slider and the slide block reciprocate in the air flow path.
It is arranged movably and rings around both ends of the slide block.
Annular packing and wear ring
Between the outer circumference of both ends of the slide block and the air flow path
Surface is sealed, so that air
Low leakage and high performance of brake system.

[Brief description of the drawings]

FIG. 1 is a perspective view of a linear motion actuator with a brake device according to a first embodiment of the present invention;
It is a longitudinal front view of a tuator .

FIG. 2 is a perspective view of the linear actuator with a brake device according to the first embodiment of the present invention;
A partial cross section is shown in a side view of the tutor .

FIG. 3 is a partial cross-sectional side view of the air supply device according to the first embodiment of the present invention;

FIG. 4 is an enlarged view of a main part (air supply device) of FIG. 1;

FIG. 5 is an enlarged view of a main part of FIG. 3;

[6] linear Accession with brake device of the second embodiment of the present invention
It is a longitudinal front view of a tuator .

[7] linear Accession with brake device of the second embodiment of the present invention
A partial cross section is shown in a side view of the tutor .

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Way table 2 Slide table 8, 9 Brake plate 41 Guide member 44 Port block 46 Port cover 48 Slit 49 Lower band 50 Upper band 52 Port guide 61-65 Air passage

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Fukushima 4-2-2 Kinnodai, Taniwara-mura, Tsukuba-gun, Ibaraki Prefecture SMC Corporation Tsukuba Technical Center (56) References ) Hikaru 2-143504 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A slide table is slidably held on the track rail, both ends of the inserted through the brake plate in the slide table is fixed to the raceway base end portions, a brake device nipping the brake plate to the slide table In a linear motion actuator with a brake device provided therein, a guide member disposed on a track is provided with an upper slit extending in a longitudinal direction.
And the air passage at the center are formed, and the slide table
Coupled port block is linearly movably supported by the guide members on hand, the strip above and below the slits are arranged, narrow portion of the central portion slit port guides the guide member is inserted into, Port guide has upper and lower ends
Connected to port block and slide block respectively
The lower part of the port guide and the slide block
A reciprocatingly arranged in the flow path,
Annular packing and wear ring are provided on the outer periphery of both ends.
Outside of both ends of the slide block with annular packing
The gap between the circumference and the inner surface of the air flow path is sealed, and the slide block
The passage formed in the block is the air passage of the slide block,
Port guide air passage and port block air passage
A linear motion actuator with a brake device, wherein the linear motion actuator is connected to the brake device via