JPH02196175A - Brake for linear movement equipment - Google Patents

Abstract

PURPOSE: To determine an accurate stopping position with a simple device by providing a structure for performing damping by applying a pressure to connect a slide surface on the side of a piston of a linear motion apparatus such as a pressurized fluid cylinder or the like to a damping surface outside the apparatus at suitable time. CONSTITUTION: A piston 2 reciprocating in a cylinder 1 is provided with a dog 4 projecting outward through a slit 5, and additionally provided with a bar section 9 via an adapter member 8 over a whole length of the cylinder 1. The bar section 9 comprises two legs 10, 11 connected to each other by a web 12. A groove 15 is formed in a side of each leg 10, 11 facing a narrow space 13 between the legs 10 and 11 to accommodate a T-shaped scaling strip 16. Further, when a pressure is applied into the space 13, the legs 10 and 11 are separated from each other, thus permitting the movement of a damping device 17 integrated with the dog 4 having a flange portion 8 entering the space 13. When the pressure is eliminated from the space 13, the movement of the damping device 17 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a braking device for a linear motion device comprising an elongated section and a section movable relative to the elongated section.

In pressurized fluid cylinders operating with a compressible medium such as compressed air, it is very difficult to brake and hold the piston, or piston rod, linearly in position 19 or more along the stroke of the piston. be.

The piston must be stopped and held in its intended position, whether loaded or not. 19 for stopping and fixing the piston at the intended resting position
The solution is to provide the piston, ie the piston rod, with a belt or chain that can be actuated directly by the braking device. However, this solution presents a significant risk of belt or chain wear and breakage. Careful maintenance and smooth braking are required for the device to function properly.

Another solution is disclosed in European Patent Publication 0104364. This concerns a braking device associated with a working cylinder without a piston rod. A fluid-driven brake device is integrated into the movable dog of the device, the brake device acting on the working cylinder. This implies a relatively complex construction of the fluid-driven brake system and the need for flexible tubing to supply fluid to the brake system that moves with the dog.

It is extremely difficult to efficiently brake and lock a dog or rider in a cylinder with a magnetic piston located outside the cylinder and guided by the cylinder or driving the dog or rider. A similar situation exists for so-called linear motors, in which the movable body is moved by electromagnets along a linear rail or the like.

The present invention is intended to eliminate the head closure associated with prior art braking linear motion devices, such as piston-cylinder devices, when the movable part moves linearly along an elongated section, and at the same time is much easier to make than was previously possible. This is achieved by the invention having the features specified in the claims.

Next, the present invention will be explained with reference to the drawings.

In order to more easily understand the present invention shown in FIGS. 2 to 6, a known piston cylinder device to which the present invention is applied will be briefly described with the piston rod omitted. This type of screw-in-cylinder device mainly consists of a cylinder 1 and a piston 2, with seals 3 provided at both ends of the piston.

The piston 2 is also provided with a propulsion dog 4 extending from the piston through a longitudinal sleeve (c-i) of the cylinder wall.
It is being A sealing strip 6 seals the slit. Both ends of the cylinder are sealed by end covers, which are provided with compressed air connections 7.

The invention will be explained below based on this summarized cylinder format.

A first embodiment of the invention is shown in FIG.

The cylinder 1 is shown very schematically, the end cover is not shown, and the piston 2 is provided with a dog 4 moving within the cylinder 1. The slit is indicated by 5.

A bar section 9 extending along the entire length of the cylinder is attached to the cylinder via an adapter member 8, which also extends along the entire length of the cylinder. Basically, this bar section is formed by two legs 10 and 11 connected to each other by a web 12. The space between the legs is a narrow space 13,
The space 13 opens out into a wide groove 14 near the edge of the leg. At the junction between the space 13 and the groove 14, each leg is provided with a groove 15 along the section 9 for accommodating a sealing strip 16 in the T-shape 4. section 9 is sealed at both ends. There is a coupling (not shown) connecting space 13 to a source of fluidizing medium. Braking device] 7 is dog 4
and has a flange portion 18 extending downwardly into the groove 14. The free end of the flange portion terminates away from the outer surface of the sealing strip 16.

When there is pressure in space 13, legs 0 and 11 are cantered, allowing the flange part of device 17 to move unhindered in trough 14 as piston 3 and dog 4 move in cylinder j. Can be done. When the pressure is reduced in the space 13, the leg 10 springs back towards the leg 11, and the control surfaces 19 and 20 contained in the lever 14 clamp the flange portion 18 between the legs; In this way, the piston and dog are braked into a fixed position.

In a practical embodiment, the movement of the piston 2 within the cylinder 1 can be sensed by a conventional pulse counter (not shown). The pulse counter includes a belt wrapped around return pulleys at each end of the cylinder, with a portion attached to the dog. This lick pulse counter sends a signal when a predetermined stop position for the piston is reached. The opposite pressure of the fluid in the cylinder causes the piston to stop while the brake system of the present invention is actuated to lock the piston in the stopped position.

FIG. 3 shows a second embodiment of the invention, in which:
A space 13 is formed directly within the cylinder material.

In this embodiment, the movable leg 10 has a braking surface on the inside edge of the -F section. The space is sealed in this embodiment with an O-section sealing member 3. The sealing members are arranged in arcuate longitudinal grooves formed in the cylinder wall and the leg, respectively. A braking device 17° is fixed to the dog 4 and has a braking surface engaging the braking surface 19. As mentioned in connection with Figure 2, space 1
3 is connected to a source of pressurized fluid and can be placed under pressure. The mechanism of the device in FIG. 3 corresponds to the function of the device in FIG. 2, the difference being that here only 19 braking surfaces are used to perform the braking function, and the braking device 1
7'' and the dog are supported by the cylinder wall when acted upon by the braking surface 19.

FIG. 4 shows a third embodiment of the present invention which basically corresponds to the embodiment shown in FIG.
is formed with a yoke or caliper with two flanges 2) and 22, each flange extending outside a section 9 fixed to the cylinder via an adapter 8.The ends of the legs of the bar are connected to each other. The braking surfaces 19, 20 of the legs have braking surfaces 19, 20 on the remote side.The function is explained as follows: when pressure is supplied to the space 13 via the coupling (indicated at 23), the braking surfaces 19 and 20 of the legs are connected to the braking device 17. ”
engages the braking surface of the FIG. 4 also shows how the brake device is attached to the dog 4 so that it is given a certain amount of movement in a plane perpendicular to the central axis of the cylinder. The braking device is floating and can be adjusted to accommodate small dimensional changes along the bar 9.

This means that the mounting on the dog 4, which is provided with a longitudinal projection 25, is carried out by means of a device 24, in which flanges 26 and 27 of the caliper 17'° are engaged in a sliding fit on both sides of the projection 25. ing. The caliper 17'' is prevented from moving axially relative to the assembly 24 (see FIG. 5) by stop plates 28 fixed to each end of the assembly.

A fourth embodiment is shown schematically in FIG.

In this embodiment, the bar section is replaced by two bars 10' and 11', which occupy the position of the legs and are not connected to each other. 2 bars 10' 11
' is supported on two U-shaped rails in the same way as the aforementioned bar section 9 extends along the length of the cylinder 1. The previously described longitudinal seals have been replaced by steel strips 30 housed in grooves in the bar. At the same height as the strip 30, each bar 10”
, 11' are provided with vertical beads 31, etc.
This bead seats in a corresponding groove inside the leg of the rail 29. The tube 32 is arranged downwardly between the bars and, as can be seen in FIG. 6, is arranged in a longitudinal recess inside the bars. The tube is connected to a source of pressurized fluid.

Bar 10', similar to that described in connection with FIG.
, 11' form a gap 14 upwardly into which a flange portion 18 of the brake device 17''' extends. Braking device 17 similar to that described in connection with FIG.
''' can be displaced relative to the device 24 in a plane perpendicular to the central axis of the cylinder 1. An axial displacement of the braking device relative to the mounting device 24 is likewise prevented by a stop plate 28, as before. When pressurized fluid is supplied to the tube 32, the ends of the bar are pushed outward and the upper end with the braking surfaces 19 and 20 reaches the braking device 17°.
Tighten and brake around the flange portion of the piston to hold it in place.

In summary, as is clear from the foregoing description, the present invention is a simple device and at the same time achieves reliable and reliable operation. The brake device is configured such that the brake device brakes and holds the piston, either when pressure is removed from the brake device or when pressure is applied to the brake device.
Can be formed.

As mentioned regarding the function of the brake device, its parts have minimal wear, since when the brake device is activated, the piston is already at rest in its rest position. Of course, the precise order is not necessarily a requirement for the functionality of the invention.

As mentioned above, although the invention is schematically illustrated in the drawings, the details of the invention may be varied within the knowledge of those skilled in the art.

Thus, the y410 can be screwed to the leg 11 or the cylinder 1 or connected by a steel leaf spring. The adapter member 8 shown in FIG. 2 may be provided solely for connecting the lower part of the bar section 9 to the cylinder, so that the leg 11 is movable relative to the cylinder.

In the device shown in FIG. 6, 19 legs can also be used to force the tube against the fixed surface of the cylinder.

Although devices have been described that operate on compressible media such as compressed air, the invention is also applicable to piston-cylinder devices that operate on incompressible media such as hydraulic oil. In this case, the braking device can be used as a safety device or as an emergency brake in case the hydraulic pressure fails. As stated in the introduction, the invention is, of course, useful for linear motion, for example in linear motors, ribbon or belt cylinders, and in cylinders with magnetic pistons and external riders that are not mechanically attached to the piston. It can equally be used in certain other connections.

Both gases (air) and liquids are used as working fluids for the brake system of the present invention. The braking device may be configured to be actuated by an electromagnet.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram, partially in section, of a known type of piston-cylinder to which the invention shown in the following figures applies. FIG. 2 is a schematic perspective view of the first embodiment of the invention. FIG. 3 is a schematic perspective view of a second embodiment of the invention.6 FIG. 4 is a schematic sectional view of a third embodiment of the invention. 5 is a plan view of the apparatus of FIG. 4; FIG. FIG. 6 is a schematic cross-sectional view of a fourth embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Cylinder, 2...Bissline, 3...Seal, 4...Dog, 5...Slit, 6...Sealing stop, 9...Bar section, 16...・Sealing strip, 17.17.17" 18...flange part, ]9.20...braking surface, 32...tube. 1.7'''...braking device, jq 2 FB 4

Claims (11)

[Claims] (1) In a braking device for a linear motion device, the elongated part (
1) and a part (2) movable relative to the elongated part (2), wherein at least one braking surface (19, 20) movable relative to the central axis of the elongated part (1) Braking device, characterized in that it is arranged along substantially the entire stroke of the braking surface and is configured such that said braking surface interacts with a second braking surface assigned to the movable part (2). (2) In the braking device according to claim 1, at least one
The two legs (10, 11; 10', 11') are elongated (
1), the leg is pivotable about an axis parallel to the central axis of the elongated portion, and the first braking surface (19, 20) extends along one longitudinal edge of the leg. A device characterized in that it is arranged along a section. (3) In the braking device according to claim 2, the legs (10, 1
1; 10', 11') is the second longitudinal edge of the longitudinal part (
1), the braking device being rigidly attached to the braking device, characterized in that the legs are arranged at a distance from the fixed surface with respect to the elongated portion (FIGS. 2, 3, 4). (4) A braking device according to claim 3, wherein the space between the fixed surface and the leg (10, 11; 10', 11') is sealed at both ends and along the edge of the leg;
Braking device, characterized in that pressurized fluid can be inserted into the space (13) created in this way. (5) A braking device according to any one of claims 1 to 4, wherein the elongated part is a cylinder (1), the movable part is a piston (2), and the other longitudinal edge of the leg (10). Braking device characterized in that the part is integrally connected to the elongated part (1). (6) A braking device according to any one of claims 4 or 5, in which the first braking surface (19) comprises a space (13).
A braking device characterized in that it is arranged on the side part of the leg (10) facing the. (7) A braking device according to claim 6, in which a further first braking surface (20) is arranged facing the first braking surface (19) and is arranged on the movable part (2 and 4) and A braking device (17) having a braking surface is connected to a first braking surface (19).
. (8) A braking device according to any one of claims 4 or 5, in which the first braking surface (19) comprises a space (13).
A braking device characterized in that it is arranged on the side of the leg (10) facing away from the. (9) A braking device according to claim 8, wherein a yoke or caliper-shaped braking device (17”) is connected to the movable parts (2 and 4) and adapted to interact with the first braking surface (19). A braking device, characterized in that the braking device is located at the edge and has a second braking surface. (10) In the braking device according to claim 2, the axis about which the leg (10') pivots is arranged between the edges of the leg, and the axis is applied along the other edge of the leg. Braking device characterized in that there is a tube (32) inflated by fluid, which tube is arranged between the leg and a bolster arranged along the elongated section. (11) The braking device according to claim 10, wherein the bolster surface has a mirror image relationship with respect to the second leg (10').
a braking device (24, 17''') formed by a second braking surface and arranged on the movable part (2, 4);
) is configured to extend downwardly between the gap (14) formed between the two first braking surfaces (19, 20) of the two legs.