Automatic braking system for power failure of linear motor

Abstract

The invention relates to the technical field of motor braking, and discloses an automatic braking system for power failure of a linear motor. A braking mechanism is arranged between a secondary transplanting block and a linear rail; the braking mechanism comprises a base block and a sliding block, a magnetic attraction assembly is arranged between the base block and the sliding block, and a hydraulic band-type brake assembly used for braking is arranged on the sliding block; the hydraulic band-type brake assembly used for braking is driven by the magnetic attraction assembly to work, that is, after the linear motor is powered off, a coil is automatically powered on and magnetized, a magnetic attraction piece is attracted to the base block, then the magnetic attraction piece drives a piston to move through a connecting rod, a profiling push block is driven to stretch out through the hydraulic effect to tightly hold a linear rail, and therefore the braking function is achieved; under the action of external atmospheric pressure, the piston and the profiling push block are shrunk and reset again; the system is exquisite in structural design, high in response speed, low in space requirement and easy to install, the cost is greatly reduced, and the occupied space is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of motor brakes, and in particular to an automatic brake system for powering off a linear motor. Background Art

[0002] A linear motor is a transmission device that converts electrical energy directly into linear motion mechanical energy without any intermediate conversion mechanism. Its working principle is to generate a traveling wave magnetic field in the stator, which interacts with the magnetic field in the mover, thereby generating a thrust in a linear direction, causing the mover to move linearly along the stator; similar to the radial section of a rotary motor, it converts rotary motion into linear motion. It can be understood as the most primitive linear motor that is obtained by radially cutting a rotary motor and expanding the circumference of the motor into a straight line. The side evolved from the stator is called the primary side, and the side evolved from the rotor is called the secondary side.

[0003] For some equipment that requires high-precision positioning, the unexpected movement of the linear motor after power failure will destroy the positioning accuracy of the equipment and affect subsequent production or experiments. In addition, in many application scenarios, the equipment driven by the linear motor may be in a dangerous position or carry important loads. If there is no braking device after power failure, the linear motor may continue to move due to inertia, causing collision and damage to the equipment. Therefore, the braking device can ensure that the equipment remains stable after power failure and does not shift in position.

[0004] However, most of the existing linear motor brake devices on the market currently use pneumatic or hydraulic brakes. This type of braking method requires an air / hydraulic pump, which is not only costly and occupies a large space, but also has a slow braking response speed and is prone to the aforementioned accuracy and safety issues. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an automatic braking system for a linear motor when power is cut off. The hydraulic connecting rod piston is driven by electromagnetic force so that the piston pushes a push block through hydraulic pressure to achieve a holding brake. The system uses an electromagnetically driven hydraulic piston push block to achieve a holding brake, thereby ensuring that the linear motor can respond accurately and quickly to a brake stop.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: An automatic brake system for power failure of a linear motor, comprising a secondary transfer block slidably mounted on a linear rail, a brake mechanism being arranged between the secondary transfer block and the linear rail; the brake mechanism comprising a base block connected to the secondary transfer block, a slider being connected to one side of the base block, a slide slot being provided on the slider, and the linear rail being slidably embedded in the slide slot; a magnetic attraction component being arranged between the base block and the slider, and a hydraulic brake component for braking being arranged on the slider; the magnetic attraction component comprising an energized magnetic coil, the coil being mounted on the base block, and a magnetic attraction sheet capable of being attracted by the magnetic coil being further arranged between the base block and the slider; the hydraulic brake component comprising a hydraulic chamber and a contour push block arranged on the slider, the rear end of the contour push block being located in the hydraulic chamber, the front end extending into the slide slot, and the front end of the contour push block being capable of abutting against the linear rail; a piston capable of driving the contour push block to extend out by hydraulic pressure being arranged in the hydraulic chamber, and the piston being connected to the magnetic attraction sheet through a connecting rod.

[0007] Optionally, a fluid medium is provided in the hydraulic chamber, the fluid medium is located on the rod side of the piston, and the rear end of the contoured push block is immersed in the fluid medium.

[0008] Optionally, the base block is fixedly connected to the slider via a fastener, and a gap is provided between the base block and the slider for movement of the magnetic attraction sheet.

[0009] Optionally, the magnetic sheet is slidably mounted on the fastener, a bushing is further mounted on the fastener, and the bushing is located between the magnetic sheet and the fastener.

[0010] Optionally, the connecting rod is movably arranged on the sliding block, and one end of the connecting rod is fixedly connected to the magnetic sheet, and the other end extends into the hydraulic chamber and is fixedly connected to the piston.

[0011] Optionally, a friction plate for increasing friction force is fixedly mounted on the front end of the contoured push block, and the friction plate is pressed against the linear rail during braking.

[0012] Optionally, a plurality of coils are provided, and the plurality of coils are distributed in a straight line and equidistantly at intervals on a side of the base block close to the magnetic attraction sheet.

[0013] Optionally, the magnetic attraction component is located above the linear rail, and two groups of hydraulic brake components are provided, which are symmetrically distributed on both sides of the linear rail.

[0014] Compared with the prior art, the present invention has the following beneficial effects: (1) The hydraulic brake assembly used for braking is driven by the magnetic suction assembly. That is, after the linear motor is powered off, the coil is automatically energized and magnetized, and the magnetic suction sheet is attracted to the base block. The magnetic suction sheet then drives the piston to move through the connecting rod, and drives the contour push block to extend through the hydraulic action to hold the linear rail, thereby realizing the braking function. After the coil is powered off, the piston and the contour push block retract and return to their original position under the action of the external atmospheric pressure. The system has a sophisticated structural design, fast response speed, low space requirements, and is easy to install. It does not require additional air pumps or hydraulic pumps, which greatly reduces costs and reduces space occupied. (2) In order to increase the friction between the profiling push block and the linear rail, a friction plate is also provided at the front end of the profiling push block. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an automatic braking system for a linear motor power failure according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the top view of the structure of the automatic braking system when the linear motor is powered off according to an embodiment of the present invention; Figure 3 is a schematic structural diagram of a brake mechanism in an embodiment of the present invention; Figure 4 is a side structural schematic diagram of a brake mechanism in an embodiment of the present invention; Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure of the middle AA section (in the unbraked state); Figure 6 yes Figure 4 Schematic diagram of the cross-sectional structure of the middle BB section; Figure 7 It is a schematic diagram of the position structure of the contour push block and the linear rail in the braking state in the embodiment of the present invention; Among them, 1. base; 2. linear rail; 3. Braking mechanism; 31. Base block; 32. Sliding block; 33. Magnetic sheet; 34. Sliding groove; 35. Connecting rod; 36. Piston; 37. Profile push block; 38. Friction sheet; 4. Secondary transplant block; 5. Cover plate; 6. Fasteners; 7. Bushing; 8. Coil. DETAILED DESCRIPTION

[0016] The present invention will now be further described in detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0017] Embodiment 1, as Figure 1-Figure 2As shown, an automatic braking system for power failure of a linear motor includes a base 1, a linear rail 2 is fixedly mounted on the base 1, a secondary transfer block 4 is slidably mounted on the linear rail 2, a cover plate 5 is also arranged above the linear rail 2, the cover plate 5 is fixedly connected to the base 1, and both ends of the secondary transfer block 4 bypass the cover plate 5 and extend upward to the outside thereof to facilitate the installation of the components to be driven, and a braking mechanism 3 is arranged between the secondary transfer block 4 and the linear rail 2.

[0018] As mentioned above, driven by the magnetic field, the secondary transfer block 4 of the linear motor can make reciprocating linear motion along the linear rail 2, and when the linear motor is powered off, the braking mechanism 3 is immediately powered on to brake the secondary transfer block 4 to ensure that it remains stable after power failure and does not shift in position; for this purpose, a 24V DC power supply independent of the device circuit is required to be separately equipped to power the braking mechanism 3 separately when the device is powered off; when the main device is powered off, in order to achieve rapid response and precise braking of the high-speed moving and extremely large inertia transfer block, the 24V DC power supply is powered on to drive the control switch and incorporate it into the main circuit, that is, when the main device loses power for the first time, the braking mechanism 3 can achieve rapid response.

[0019] Embodiment 2: Based on embodiment 1, the present invention further proposes a specific structure of the braking mechanism 3 .

[0020] like Figure 3-Figure 7 As shown, the braking mechanism 3 includes a base block 31, a slider 32, a magnetic attraction component and a hydraulic brake component. The base block 31 is fixedly connected to the secondary transfer block 4, and the slider 32 is fixedly connected to the base block 31 through a fastener 6. A slide groove 34 is provided on the slider 32, and the linear rail 2 is slidably embedded in the slide groove 34; and the magnetic attraction component is arranged between the base block 31 and the slider 32, and the hydraulic brake component is arranged on the slider 32.

[0021] Among them, the base block 31, the slider 32 and the secondary transfer block 4 can realize synchronous movement along the linear rail 2, the hydraulic brake assembly is used for braking the secondary transfer block 4, and the magnetic suction assembly is used to drive the hydraulic brake assembly to work.

[0022] As mentioned above, the magnetic attraction component includes a coil 8 and a magnetic attraction sheet 33. The coil 8 is fixedly mounted on the base block 31, and the magnetic attraction sheet 33 is arranged between the base block 31 and the slider 32. When the coil 8 is energized, it becomes magnetic, and the generated magnetic field can attract the magnetic attraction sheet 33, causing it to move from the initial position to the adsorption position.

[0023] The hydraulic brake assembly includes a hydraulic chamber and a contoured push block 37, the former is opened inside the slider 32, and the latter is movably arranged on the slider 32, and the rear end of the contoured push block 37 is located in the hydraulic chamber, and the front end extends into the slide groove 34. After the front end of the contoured push block 37 is extended, it can be against the linear rail 2, and the friction force generated by the brake structure is used to brake the secondary transfer block 4.

[0024] A piston 36 is installed in the hydraulic chamber, and the piston 36 is connected to the magnetic sheet 33 through a connecting rod 35. A fluid medium is provided in the hydraulic chamber, and the fluid medium is located on the rod side of the piston 36, and the rear end of the contoured push block 37 is immersed in the fluid medium; the connecting rod 35 is movably inserted into the slider 32, and one end of the connecting rod 35 is fixedly connected to the magnetic sheet 33, and the other end extends into the hydraulic chamber and is fixedly connected to the piston 36.

[0025] Specifically, the fluid medium and the contour push block 37 are both located on the rod chamber side of the hydraulic chamber. After the coil 8 is energized, the magnetic attraction sheet 33 is attracted to move it from the initial position to the adsorption position, and then the piston 36 is driven to move upward in the hydraulic chamber through the connecting rod 35, squeezing the closed fluid medium in the hydraulic chamber to generate a strong hydraulic pressure. Under the action of the strong hydraulic pressure, the contour push block 37 moves horizontally outward in the hydraulic chamber, that is, the front end extends until it fits with the linear rail 2. At this time, the brake mechanism 3 is in a braking state (such as Figure 7 The system has a sophisticated structural design, fast response speed, low space requirements, easy installation, and does not require additional air pressure pumps or hydraulic pumps, which greatly reduces costs and space occupation.

[0026] Among them, the fluid medium uses common hydraulic oil, and the hydraulic oil does not completely fill the rod cavity of the hydraulic chamber, so that the piston 36 can move in the hydraulic chamber; the side of the linear rail 2 is usually provided with a guide groove, and the shape of the front end of the contoured push block 37 is similar to the internal contour of the groove, so as to achieve a close fit.

[0027] After the linear motor is powered on, the 24V DC power supply integrated into the main circuit is powered off, that is, the magnetic attraction component loses power, and the magnetic force generated by the coil 8 disappears; since the rodless chamber of the hydraulic chamber is in a negative pressure state in the braking state, after the magnetic attraction disappears, under the action of the external atmospheric pressure, the magnetic attraction sheet 33 drives the piston 36 to reset through the connecting rod 35, and the contoured push block 37 is also reset under the same action, and then the brake mechanism 3 returns to the non-braking state (such as Figure 5 as shown).

[0028] Furthermore, the fastener 6 preferably adopts a screw, which passes through the base block 31 from top to bottom and is connected to the slider 32, and a gap is set between the base block 31 and the slider 32 to ensure that the magnetic attraction sheet 33 has room for movement, and can move close to the base block 31 when the magnetic force is generated, and move close to the slider 32 after the magnetic force disappears.

[0029] The fastener 6 also passes through the magnetic sheet 33, that is, the magnetic sheet 33 is slidably sleeved on the fastener 6, and the fastener 6 is also sleeved with a bushing 7, and the bushing 7 is located between the magnetic sheet 33 and the fastener 6. The bushing 7 can not only reduce the friction and wear between the magnetic sheet 33 and the fastener 6, but also play a guiding role; and the two ends of the bushing 7 are respectively in contact with the base block 31 and the slider 32, which can play a supporting role, so that there is enough space between the base block 31 and the slider 32 for the magnetic sheet 33 to move.

[0030] In order to increase the friction between the profiling push block 37 and the linear rail 2 to ensure the braking effect, a friction plate 38 is fixedly installed at the front end of the profiling push block 37, which can increase the friction and can move synchronously with the profiling push block 37. In the braking state, the friction plate 38 presses against the linear rail 2.

[0031] The magnetic suction component is located above the linear rail 2. In order to improve the braking effect of the brake, multiple hydraulic brake components are evenly divided into two groups and symmetrically distributed on both sides of the linear rail 2, which can ensure that the thrusts received by the linear rail 2 during braking are balanced, the brake mechanism 3 can operate stably, and the braking effect can be improved. The more hydraulic brake components there are, the greater the total friction generated during braking, and the better the braking effect on the secondary transfer block 4.

[0032] In order to ensure that multiple hydraulic brake components can work synchronously, that is, the magnetic sheet 33 can rise horizontally, multiple coils 8 are provided and spaced in a straight line and equidistantly on one side of the base block 31 close to the magnetic sheet 33. Under the premise of constant power supply, the more coils 8 there are, the stronger the total magnetic force generated after power is turned on, the stronger the adsorption effect on the magnetic sheet 33, and the shorter the response time.

[0033] After the linear motor is powered off, the magnetic attraction component of the brake mechanism 3 is immediately energized, and the coil 8 generates a strong magnetic attraction force under the action of the current. The magnetic attraction plate 33 drives the piston 36 to move upward through the connecting rod 35 under the action of the magnetic attraction force until the magnetic attraction plate 33 is completely in contact with the base surface of the coil 8; at this time, the piston 36 moves upward to squeeze the closed hydraulic oil in the rod cavity to generate a strong liquid pressure. Under the action of the liquid pressure, the contour push block 37 moves horizontally outward in the hydraulic chamber until the friction plate 38 fixed on the front end surface of the contour push block 37 is in close contact with the linear rail 2, generating a strong squeezing force and friction force, thereby realizing the braking work of the brake mechanism 3 on the secondary transplanting block 4.

[0034] After the linear motor is powered on, the 24V DC power supply integrated into the main circuit is powered off, that is, the magnetic attraction component loses power, and the magnetic attraction force disappears after the coil 8 loses power; due to the previous action, the rodless cavity of the hydraulic chamber is in a negative pressure state, so after the magnetic force disappears, under the action of the external atmospheric pressure, the magnetic attraction plate 33 pushes the piston 36 downward through the connecting rod 35 until the piston 36 fits the bottom of the rodless cavity; similarly, the contoured push block 37 also drives the friction plate 38 to separate from the fitted linear rail 2 under the action of the external atmospheric pressure until the contoured push block 37 fits the inner side of the slide groove 34, and then the braking mechanism 3 returns to the non-braking state.

[0035] Embodiment 3: Based on Embodiment 1 and Embodiment 2, the present invention further proposes an automatic braking method for a linear motor when power is cut off, comprising the following steps.

[0036] Step S1: After the linear motor is powered off, the brake mechanism 3 is powered on immediately.

[0037] The system is equipped with a 24V DC power supply independent of the equipment circuit, which is used to power the brake mechanism 3 separately when the equipment is powered off, and the 24V DC power supply is powered on to drive the control switch and integrate it into the main circuit; when the main equipment loses power immediately, the brake mechanism 3 can achieve a quick response, allowing the transplanting block with high-speed movement and large inertia to respond quickly and brake accurately.

[0038] Step S2: After the coil 8 of the magnetic attraction component is energized, a magnetic attraction force is generated, so that the magnetic attraction sheet 33 moves closer to the base block 31 until the magnetic attraction sheet 33 is completely in contact with the base surface of the coil 8 .

[0039] The coil 8 generates a strong magnetic attraction force under the action of the electric current, and the magnetic attraction force can attract the magnetic attraction sheet 33 to make it move between the base block 31 and the slider 32 .

[0040] Step S3: During the movement of the magnetic sheet 33 , the piston 36 is driven to move upwards through the connecting rod 35 , so as to squeeze the closed fluid medium in the rod chamber to generate a strong hydraulic pressure.

[0041] The connecting rod 35 is movably arranged on the slider 32, and one end of the connecting rod 35 is fixedly connected to the magnetic sheet 33, and the other end extends into the hydraulic chamber and is fixedly connected to the piston 36, so the magnetic sheet 33 can drive the piston 36 to move through the connecting rod 35; the fluid medium uses common hydraulic oil, and the hydraulic oil does not completely fill the rod cavity of the hydraulic chamber, so that the piston 36 can move in the hydraulic chamber and squeeze the hydraulic oil to generate a strong hydraulic pressure.

[0042] Step S4: Under the action of the hydraulic pressure, the contour push block 37 moves horizontally outward in the hydraulic chamber until the friction plate 38 fixed on the front end surface of the contour push block 37 is tightly fitted with the linear rail 2.

[0043] Since the contoured push block 37 is passed through the slider 32, and its rear end is located in the hydraulic chamber, and its front end extends into the slide groove 34, the front end of the contoured push block 37 can extend outward under the action of hydraulic pressure, and the friction plate 38 and the linear rail 2 are in contact to generate strong extrusion force and friction force to achieve friction braking.

[0044] Step S5: After the linear motor is powered on, the magnetic attraction component loses power, the magnetic attraction force of the coil 8 disappears, and under the action of the external atmospheric pressure, the magnetic attraction component and the hydraulic brake component are reset.

[0045] Since the rodless cavity of the hydraulic chamber is in a negative pressure state in the early stage, after the magnetic force disappears, under the action of the external atmospheric pressure, the magnetic attraction plate 33 pushes the piston 36 downward through the connecting rod 35 until the piston 36 fits the bottom of the rodless cavity, and the contoured push block 37 drives the friction plate 38 to separate from the fitted linear rail 2 until the contoured push block 37 fits the inner side of the slide groove 34.

[0046] In summary, the automatic braking system proposed in the present invention has a sophisticated structural design, fast response speed, low space requirement, easy installation, and does not require additional air pumps or hydraulic pumps, which greatly reduces costs and reduces occupied space.

[0047] The braking mechanism 3 is assembled on the secondary transfer block 4, and is assembled together with the secondary transfer block 4 to the linear rail 2 of the linear motor to achieve synchronous movement with the secondary transfer block 4; the braking mechanism 3 is also separately equipped with a 24V DC power supply independent of the device circuit, which is used to power the braking mechanism 3 separately when the device is powered off, and to energize the 24V DC power supply to drive the control switch and integrate it into the main circuit; when the main device loses power for the first time, the braking mechanism 3 can achieve a quick response, which can enable the transfer block with high-speed movement and large inertia to respond quickly and brake accurately.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0049] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0050] The above is based on the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention. The technical scope of the present invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. An automatic braking system for a linear motor power failure, comprising a secondary transfer block (4) slidably mounted on a linear rail (2), characterized in that: A braking mechanism (3) is provided between the secondary transplanting block (4) and the linear rail (2); The braking mechanism (3) comprises a base block (31) connected to the secondary transfer block (4); a slider (32) is connected to one side of the base block (31); a slide groove (34) is provided on the slide groove (32); and the linear rail (2) is slidably embedded in the slide groove (34); A magnetic attraction component is provided between the base block (31) and the slider (32), and a hydraulic brake component for braking is provided on the slider (32); The magnetic attraction component comprises a coil (8) that is energized and magnetic, the coil (8) being mounted on the base block (31), and a magnetic attraction sheet (33) that can be attracted by the magnetic coil (8) being arranged between the base block (31) and the slider (32); The hydraulic brake assembly comprises a hydraulic chamber and a contoured push block (37) arranged on the slider (32); the rear end of the contoured push block (37) is located in the hydraulic chamber, the front end extends into the slide groove (34), and the front end of the contoured push block (37) can abut against the linear rail (2); A piston (36) capable of driving the contoured push block (37) to extend out through hydraulic pressure is installed in the hydraulic chamber, and the piston (36) is connected to the magnetic attraction sheet (33) through a connecting rod (35).

2. The automatic braking system for linear motor power failure according to claim 1, characterized in that: A fluid medium is arranged in the hydraulic chamber, the fluid medium is located on the rod side of the piston (36), and the rear end of the contoured push block (37) is immersed in the fluid medium.

3. The automatic braking system for linear motor power failure according to claim 1, characterized in that: The base block (31) is fixedly connected to the slider (32) via a fastener (6), and a gap for the magnetic attraction sheet (33) to move is provided between the base block (31) and the slider (32).

4. The automatic braking system for linear motor power failure according to claim 3, characterized in that: The magnetic attraction sheet (33) is slidably sleeved on the fastener (6), and a bushing (7) is also sleeved on the fastener (6), and the bushing (7) is located between the magnetic attraction sheet (33) and the fastener (6).

5. The automatic braking system for linear motor power failure according to claim 1, characterized in that: The connecting rod (35) is movably mounted on the slider (32), and one end of the connecting rod (35) is fixedly connected to the magnetic sheet (33), while the other end extends into the hydraulic chamber and is fixedly connected to the piston (36).

6. The automatic braking system for linear motor power failure according to claim 1, characterized in that: A friction plate (38) for increasing friction force is fixedly mounted on the front end of the contoured push block (37), and the friction plate (38) is pressed against the linear rail (2) during braking.

7. The automatic braking system for linear motor power failure according to claim 1, characterized in that: A plurality of the coils (8) are provided, and the plurality of coils (8) are distributed in a straight line and at equal intervals on a side of the base block (31) close to the magnetic attraction sheet (33).

8. The automatic braking system for linear motor power failure according to claim 1, characterized in that: The magnetic attraction component is located above the linear rail (2), and two groups of hydraulic brake components are provided, which are symmetrically distributed on both sides of the linear rail (2).

Images