A ball screw drive with reverse stop

Abstract

This invention discloses a ball screw drive with reverse stop, belonging to the field of mechanical transmission technology. Compared with the prior art, when the screw nut rises to a suitable height, it will contact the self-locking component, which locks the screw nut, thereby fixing the screw nut to the screw body. This solves the problem of the screw nut reversing or falling under load or vibration, resulting in high safety. Since the screw nut is fixed to the load and bears the working load, the load on the self-locking block is also relatively large during self-locking. The force dissipation component can achieve a force dissipation effect on the self-locking block. When the load changes, the self-locking block is less likely to have a rigid impact with the self-locking groove, thus improving the service life of the self-locking block. The shielding component allows the brush layer to form a filter layer to effectively filter dust from the external environment, preventing dust from accumulating in the self-locking groove. The brush layer can also rub against the self-locking groove, thereby effectively solving the problem of dust accumulation.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission technology, and in particular to a ball screw transmission with reverse stop. Background Technology

[0002] For today's machining and manufacturing industry, the transmission efficiency of ball screws is as high as 85% to 98%, which is 2 to 4 times that of ordinary sliding screws. Using ball screws is one of the effective measures to improve the sensitivity of the feed system, positioning accuracy and prevent crawling. Therefore, it is widely used in CNC machine tools and the technical transformation of old equipment.

[0003] After reaching the top, a vertically moving ball screw needs to bear the load for a long time and maintain its original position to prevent it from falling. However, the ball screw is a point contact rolling motion with a low coefficient of friction and no self-locking property.

[0004] When the motor stops rotating, the existing ball screw bears the working load because the screw nut is fixed to the load. When the load changes, the ball screw will reverse the transmission, resulting in poor safety. In addition, the load equipment may generate a lot of dust during subsequent grinding or cutting, which will affect the performance. Summary of the Invention

[0005] 1. Technical problems to be solved

[0006] To address the problems existing in the prior art, the present invention aims to provide a ball screw drive with reverse stop. Compared with the prior art, when the screw nut rises to a suitable height, it will contact the self-locking component, which locks the screw nut, thereby fixing the screw nut to the screw body. This solves the problem of the screw nut reversing or falling under load or vibration, resulting in high safety. Since the screw nut is fixed to the load and bears the working load, the load on the self-locking block is also relatively large during self-locking. The force-dissipating component can achieve a force-dissipating effect on the self-locking block. When the load changes, the self-locking block is less likely to have a rigid impact with the self-locking groove, thus improving the service life of the self-locking block. The shielding component allows the brush layer to form a filter layer to effectively filter dust from the external environment, preventing dust from accumulating in the self-locking groove. The brush layer can also rub against the self-locking groove, thereby effectively solving the problem of dust accumulation.

[0007] 2. Technical Solution

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] A ball screw drive with reverse stop includes a screw body and a screw nut mounted on the screw body. A self-locking assembly is mounted on the top of the screw body. The self-locking assembly includes a self-locking seat fixed to the top of the screw body and a self-locking ring mounted below the self-locking seat. At least two staggered self-locking grooves are carved on the outer surface of the self-locking ring. A rotating ring is rotatably connected to the top of the screw nut. A self-locking block movably passes through the top of the rotating ring. A locking block is hinged in the self-locking groove and abuts against the self-locking block. A force-relieving assembly is provided between the self-locking seat and the self-locking ring. The force-relieving assembly includes a force-relieving ring and a... The first compression spring, the outer side of the stress-relieving ring is chiseled with a buffer groove, the inner wall of the self-locking seat is provided with a positioning block that is slidably connected to the buffer groove, the inner wall of the stress-relieving ring is fixed with a lower limit block, the inner wall of the self-locking seat is fixed with an upper limit block, and the first compression spring is fixed between the upper limit block and the lower limit block, and the outer surface of the self-locking seat is fixed with a shielding assembly; the shielding assembly includes a shielding layer, a brush layer fixed to the inner wall of the shielding layer, an upper adsorption layer provided on the inner wall of the shielding layer, a lower adsorption layer provided on the outer surface of the self-rotating ring, and a tapping rod that fits against the shielding layer is provided above the shielding layer, and the tapping rod is fixed to the self-locking seat.

[0010] Furthermore, one end of the self-locking groove is inclined downwards, the inner wall of the self-locking groove is smooth, and the distance between the bottom of the locking block and the self-locking groove is less than the diameter of the self-locking block.

[0011] Furthermore, the locking block and the self-locking groove rotate at an angle of 90°, an elastic sheet is fixedly connected between the locking block and the self-locking groove, and the locking block is made of metal.

[0012] Furthermore, a second compression spring is fixedly connected between the self-locking block and the lead screw nut, and a ball bearing is embedded in the end of the self-locking block facing the self-locking ring.

[0013] Furthermore, the upper limit block and the lower limit block have a buffer gap in the initial state, so that when the lower limit block rotates at a predetermined angle, it will abut against the upper limit block.

[0014] Furthermore, the upper limit block and the lower limit block are both covered with a rubber buffer layer on their opposite surfaces, and the inner wall of the stress-relieving ring is fixed with suction cotton.

[0015] Furthermore, a bending layer is provided at the connection between the shielding layer and the self-locking seat, and the bending layer is made of an elastic material.

[0016] Furthermore, the shielding layer is composed of several rigid and flexible shielding layers spliced ​​together, and the shielding layer has a trumpet-shaped cross-section.

[0017] Furthermore, an electromagnetic block is embedded inside the self-locking ring, and the electromagnetic block corresponds to the self-locking groove. A magnetic block with the same magnetism as the electromagnetic block is embedded in the self-locking block.

[0018] Furthermore, at least two buffer grooves are provided, symmetrically distributed on the surface of the stress-relief ring, the number of positioning blocks is the same as the number of buffer grooves, and the buffer grooves are inclined.

[0019] 3. Beneficial Effects

[0020] Compared with the prior art, the advantages of this invention are:

[0021] (1) Compared with the prior art, when the lead screw nut rises to a suitable height, it will contact the self-locking component. The self-locking component locks the lead screw nut, thereby fixing the lead screw nut to the lead screw body. This solves the problem of the lead screw nut reversing or falling under load or vibration, and the safety of use is high. Since the lead screw nut is fixed to the load and bears the working load, the load borne by the self-locking block is also large when self-locking. The force dissipation component can achieve the force dissipation effect on the self-locking block. When the load changes, the self-locking block is not easy to have a rigid impact with the self-locking groove, thus improving the service life of the self-locking block. The shielding component can make the brush layer form a filter layer to effectively filter the dust in the external environment, so that the dust is not easy to accumulate in the self-locking groove. The brush layer can rub against the self-locking groove, thereby effectively solving the problem of dust accumulation.

[0022] (2) When the self-locking component is in use, the lead screw nut will drive the self-rotating ring to rise under the drive of the lead screw body until the self-locking block on the self-rotating ring is screwed into the inclined self-locking groove. During the movement of the self-locking block in the self-locking groove, it will squeeze the locking block, causing the locking block to rotate so as not to interfere with the movement of the locking block. When the self-locking block and the locking block are separated, the locking block will rotate back under the push of the metal or plastic elastic element. Since the locking block rotates in one direction, it can lock the self-locking block firmly and the self-locking effect is good.

[0023] (3) When the stress dissipation component is in use, the stress dissipation ring can slide down with the impact caused by the load change on the self-locking ring. Due to the cooperation of the buffer groove and positioning block on the outer side of the stress dissipation ring, the stress dissipation ring will rotate and slide down. During the rotation, the stress dissipation ring will squeeze the first compression spring, so that the first compression spring absorbs part of the impact force, increases the rotation damping, consumes kinetic energy, and thus reduces the impact on the self-locking block. Since the self-locking ring is connected to the stress dissipation ring, when the stress dissipation ring slides down, the self-locking ring will also slide down, thus leaving a buffer gap between the self-locking block and the self-locking groove, making it less likely to generate rigid impact, thereby improving the service life of the self-locking block.

[0024] (4) When the adsorption layer rises to a suitable distance, the upper adsorption layer will bend the shielding layer downward under the action of magnetic attraction, so that the brush layer on its inner wall will be attached to the outside of the self-rotating ring. The attached brush layer can form a filter layer that can effectively filter dust in the external environment, making it difficult for dust to accumulate in the self-locking groove, thus affecting the self-locking performance of the self-locking groove.

[0025] (5) When the load changes, the self-rotating ring can move up and down through the force dissipation component, thereby causing the brush layer to rub against the self-locking groove, thus cleaning the dust in the self-locking groove and effectively solving the problem of dust accumulation.

[0026] (6) When the rotating ring moves up and down, it will change the magnetic force of the upper adsorption layer. The magnetic force will weaken, causing the shielding layer to rise under the action of elasticity and collide with the beater. On the one hand, it cleans the dust deposited on the top, and on the other hand, it can shake off the dust on the brush layer to achieve cleaning. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a partially enlarged structural diagram of the self-locking groove of the present invention;

[0029] Figure 3 This is a partially enlarged structural diagram of the self-locking block of the present invention;

[0030] Figure 4 This is a schematic cross-sectional view of the self-locking block structure of the present invention;

[0031] Figure 5 This is a top cross-sectional view of the stress-relieving ring and self-locking seat of the present invention;

[0032] Figure 6 This is a front cross-sectional view of the stress-relieving ring and self-locking structure of the present invention;

[0033] Figure 7 This is a front view schematic diagram of the stress-relief ring structure of the present invention;

[0034] Figure 8 This is a schematic diagram of the initial state structure of the shielding layer of the present invention;

[0035] Figure 9 This is a schematic diagram of the shielding layer of the present invention moving downward under magnetic force;

[0036] Figure 10 This is a partially enlarged structural diagram of the shielding layer of the present invention.

[0037] Explanation of the labels in the diagram:

[0038] 1. Lead screw body; 2. Lead screw nut; 3. Self-locking seat; 4. Self-locking ring; 5. Self-locking groove; 6. Rotating ring; 7. Self-locking block; 8. Locking block; 9. Force-dissipating ring; 10. First compression spring; 11. Buffer groove; 13. Shielding layer; 14. Brush layer; 15. Lower adsorption layer; 16. Beating rod; 17. Electromagnetic block. Detailed Implementation

[0039] Example:

[0040] Please see Figure 1 A ball screw drive with reverse stop includes a screw body 1 and a screw nut 2 mounted on the screw body 1. A self-locking component is installed on the top of the screw body 1. Specifically, when the screw nut 2 rises to a suitable height, it will contact the self-locking component, which will lock the screw nut 2, thereby fixing the screw nut 2 to the screw body 1. This solves the problem of the screw nut 2 reversing or falling under load or vibration, and ensures high safety in use.

[0041] Please see Figure 2-4 The self-locking assembly includes a self-locking seat 3 fixed to the top of the lead screw body 1, and a self-locking ring 4 installed below the self-locking seat 3. At least two staggered self-locking grooves 5 are carved on the outer surface of the self-locking ring 4. A rotating ring 6 is rotatably connected to the top of the lead screw nut 2. A self-locking block 7 moves through the top of the rotating ring 6. A locking block 8, which abuts against the self-locking block 7, is hinged in the self-locking groove 5. A force-relieving component is provided between the self-locking seat 3 and the self-locking ring 4. Specifically, when the self-locking assembly is in use, the lead screw nut 2 is fixed to the top of the lead screw body 1. Driven by the mechanism, the self-rotating ring 6 will rise until the self-locking block 7 on the self-rotating ring 6 is screwed into the inclined self-locking groove 5. As the self-locking block 7 moves in the self-locking groove 5, it will squeeze the locking block 8, causing the locking block 8 to rotate, thus preventing interference with the movement of the locking block 8. When the self-locking block 7 separates from the locking block 8, the locking block 8 will rotate back to its original position under the push of the metal or plastic elastic element. Since the locking block 8 rotates in one direction, it can securely lock the self-locking block 7, resulting in a good self-locking effect.

[0042] Please see Figure 1 and Figure 5-7The stress-relieving assembly includes a stress-relieving ring 9 and a first compression spring 10. A buffer groove 11 is cut into the outer side of the stress-relieving ring 9. A positioning block that slides through the buffer groove 11 is provided on the inner wall of the self-locking seat 3. A lower limit block is fixed to the inner wall of the stress-relieving ring 9, and an upper limit block is fixed to the inner wall of the self-locking seat 3. The first compression spring 10 is fixed between the upper and lower limit blocks. A shielding assembly is fixed to the outer surface of the self-locking seat 3. Specifically, since the lead screw nut 2 is fixed to the load and bears the working load, the load on the self-locking block 7 is also relatively large during self-locking. The stress-relieving assembly can achieve a stress-relieving effect on the self-locking block 7. When the load changes, it prevents the self-locking block 7 from rigidly impacting the self-locking groove 5, thus improving the service life of the self-locking block 7. When the stress-relieving assembly is in use, the stress-relieving ring 9 can cause changes in the load to the self-locking ring 4. The impact of the force-dissipating ring 9 causing it to slide down is mitigated by the cooperation of the buffer groove 11 and the positioning block on its outer side. During rotation, the force-dissipating ring 9 compresses the first compression spring 10, which absorbs part of the impact force, increases rotational damping, and consumes kinetic energy, thereby reducing the impact on the self-locking block 7. Since the self-locking ring 4 is connected to the force-dissipating ring 9, it also slides down when the force-dissipating ring 9 slides down, thus leaving a buffer gap between the self-locking block 7 and the self-locking groove 5, making it less likely to generate rigid impacts and improving the service life of the self-locking block 7. It should be noted that the rotation angle of the force-dissipating ring 9 is limited, for example, 30°, so that the force-dissipating ring 9 can both buffer and dissipate force without affecting the self-locking effect on the lead screw nut 2.

[0043] Please see Figure 8-10 The shielding assembly includes a shielding layer 13 and a brush layer 14 fixed to the inner wall of the shielding layer 13. The inner wall of the shielding layer 13 is provided with an upper adsorption layer, and the outer surface of the self-rotating ring 6 is provided with a lower adsorption layer 15. A tapping rod 16 is provided above the shielding layer 13 and is attached to the shielding layer 13. The tapping rod 16 is fixed to the self-locking seat 3. Specifically, both the upper and lower adsorption layers 15 are magnetically coated. When the lower adsorption layer 15 rises to a suitable distance, the upper adsorption layer, under the influence of magnetic attraction, causes the shielding layer 13 to bend downwards, thereby causing the brush layer 14 on its inner wall to adhere to the outer side of the rotating ring 6. The adhered brush layer 14 can form a filter layer that can effectively filter dust from the external environment, making it difficult for dust to accumulate in the self-locking groove 5, thus affecting the self-locking performance of the self-locking groove 5. When the load changes, the rotating ring 6 can move up and down through the force-dissipating component, thereby causing the brush layer 14 to rub against the self-locking groove 5, cleaning the dust in the self-locking groove 5, thus effectively solving the problem of dust accumulation. Furthermore, when the rotating ring 6 moves up and down, it will change the magnetic force of the upper adsorption layer, weakening the magnetic force and causing the shielding layer 13 to rise under the action of elasticity and collide with the beater 16. On the one hand, it cleans the dust deposited on the top, and on the other hand, it shakes off the dust on the brush layer 14 to achieve cleaning.

[0044] Please see Figure 2-4The self-locking groove 5 is inclined downwards at one end, and its inner wall is smooth. The distance between the bottom of the locking block 8 and the self-locking groove 5 is less than the diameter of the self-locking block 7. The rotation angle between the locking block 8 and the self-locking groove 5 is 90°. An elastic sheet is fixedly connected between the locking block 8 and the self-locking groove 5. The locking block 8 is made of metal. A second compression spring is fixedly connected between the self-locking block 7 and the lead screw nut 2. A ball bearing is embedded in the end of the self-locking block 7 facing the self-locking ring 4. Specifically, the downward inclination of the self-locking groove 5 facilitates the upward screwing of the self-locking block 7. The distance between the bottom of the locking block 8 and the self-locking groove 5 is less than the diameter of the self-locking block 7, effectively locking the self-locking block 7. The second compression spring is fixedly connected between the self-locking block 7 and the lead screw nut 2, ensuring that the self-locking block 7 can effectively fit against the self-locking groove 5, guaranteeing the stability of the self-locking. The ball bearing is embedded in the end of the self-locking block 7 facing the self-locking ring 4, reducing frictional wear between the self-locking block 7 and the self-locking groove 5.

[0045] Please see Figure 5-6 The upper and lower limit blocks have a buffer gap in the initial state. When the lower limit block rotates to a predetermined angle, it will abut against the upper limit block. The opposing surfaces of the upper and lower limit blocks are covered with a rubber buffer layer, and the inner wall of the stress-relieving ring 9 is fixed with suction cotton. Specifically, the buffer gap between the upper and lower limit blocks in the initial state ensures that the stress-relieving ring 9, while providing buffering and stress relief, will not affect the self-locking effect on the lead screw nut 2. The rubber buffer layer and sound-absorbing cotton can effectively absorb the noise generated between the upper and lower limit blocks, and the first compression spring 10 is connected to the rubber buffer layer. The two work together to achieve the stress-relieving effect.

[0046] Please see Figure 8-9 A bending layer, made of elastic material, is provided at the connection between the shielding layer 13 and the self-locking seat 3. The shielding layer 13 is composed of several rigid shielding layers 13 and flexible shielding layers 13 spliced ​​together, and the shielding layer 13 has a trumpet-shaped cross-section. Specifically, the bending layer is made of elastic material, which facilitates the bending of the shielding layer 13 under magnetic force. The shielding layer 13 is composed of several rigid shielding layers 13 and flexible shielding layers 13 spliced ​​together, so that when the shielding layer 13 bends downward, the rigid shielding layer 13 can compress the flexible shielding layer 13, thereby reducing the gap between it and the self-locking groove 5. The shielding layer 13 is made of elastic rubber and flexible rubber material.

[0047] Please see Figure 2 An electromagnetic block 17 is embedded inside the self-locking ring 4, and the electromagnetic block 17 corresponds to the self-locking groove 5. A magnetic block with the same magnetism as the electromagnetic block 17 is embedded in the self-locking block 7. Specifically, the self-locking block 7 has a magnetic block with the same magnetism as the electromagnetic block 17. When the electromagnetic block 17 is activated, it generates a repulsive magnetic force, causing the self-locking block 7 to slide away from the self-locking groove 5, thereby achieving the unlocking operation.

[0048] Please see Figure 7At least two buffer grooves 11 are provided, symmetrically distributed on the surface of the stress-relief ring 9. The number of positioning blocks is the same as the number of buffer grooves 11. The buffer grooves 11 are inclined. Specifically, at least two buffer grooves 11 are provided, symmetrically distributed on the surface of the stress-relief ring 9, thereby improving the stability of the buffer grooves 11 when rotating and sliding down.

[0049] Compared with existing technologies, when the lead screw nut 2 rises to a suitable height, it will contact the self-locking component, which will lock the lead screw nut 2, thereby fixing the lead screw nut 2 to the lead screw body 1. This solves the problem of the lead screw nut 2 reversing or falling under load or vibration, resulting in high safety. Since the lead screw nut 2 is fixed to the load and bears the working load, the load borne by the self-locking block 7 is also relatively large during self-locking. The force dissipation component can achieve a force dissipation effect on the self-locking block 7. When the load changes, the self-locking block 7 is less likely to have a rigid impact with the self-locking groove 5, thus improving the service life of the self-locking block 7. The shielding component allows the brush layer 14 to form a filter layer to effectively filter dust from the external environment, making it less likely for dust to accumulate in the self-locking groove 5. The brush layer 14 can also rub against the self-locking groove 5, thereby effectively solving the problem of dust accumulation.

[0050] The above are merely preferred embodiments of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A ball screw drive with reverse stop, comprising a screw body (1) and a screw nut (2) mounted on the screw body (1), characterized in that: A self-locking assembly is installed on the top of the lead screw body (1); The self-locking assembly includes a self-locking seat (3) fixed to the top of the lead screw body (1) and a self-locking ring (4) installed below the self-locking seat (3). The outer surface of the self-locking ring (4) has at least two staggered self-locking grooves (5). The top of the lead screw nut (2) is rotatably connected to a self-rotating ring (6). A self-locking block (7) is movably passed through the top of the self-rotating ring (6). A locking block (8) that abuts against the self-locking block (7) is hinged in the self-locking groove (5). A force-dissipating assembly is provided between the self-locking seat (3) and the self-locking ring (4). The force-relieving component includes a force-relieving ring (9) and a first compression spring (10). A buffer groove (11) is chiseled on the outer side of the force-relieving ring (9). A positioning block that is slidably connected to the buffer groove (11) is provided on the inner wall of the self-locking seat (3). A lower limit block is fixed on the inner wall of the force-relieving ring (9). An upper limit block is fixed on the inner wall of the self-locking seat (3). A first compression spring (10) is fixed between the upper limit block and the lower limit block. A shielding component is fixed on the outer surface of the self-locking seat (3). The shielding assembly includes a shielding layer (13) and a brush layer (14) fixed to the inner wall of the shielding layer (13). The inner wall of the shielding layer (13) is provided with an upper adsorption layer, and the outer surface of the self-rotating ring (6) is provided with a lower adsorption layer (15). A tapping rod (16) is provided above the shielding layer (13) and is attached to the shielding layer (13). The tapping rod (16) is fixed to the self-locking seat (3).

2. A ball screw drive with reverse stop according to claim 1, characterized in that: One end of the self-locking groove (5) is inclined downwards, the inner wall of the self-locking groove (5) is smooth, and the distance between the bottom of the locking block (8) and the self-locking groove (5) is less than the diameter of the self-locking block (7).

3. A ball screw drive with reverse stop according to claim 2, characterized in that: The locking block (8) rotates at a 90° angle with the self-locking groove (5). An elastic sheet is fixedly connected between the locking block (8) and the self-locking groove (5). The locking block (8) is made of metal.

4. A ball screw drive with reverse stop according to claim 3, characterized in that: A second compression spring is fixedly connected between the self-locking block (7) and the lead screw nut (2), and a ball is embedded in one end of the self-locking block (7) facing the self-locking ring (4).

5. A ball screw drive with reverse stop according to claim 1, characterized in that: The upper limit block and the lower limit block have a buffer gap in the initial state. When the lower limit block rotates at a predetermined angle, it will abut against the upper limit block.

6. A ball screw drive with reverse stop according to claim 5, characterized in that: The upper limit block and the lower limit block are both covered with a rubber buffer layer on their opposite surfaces, and the inner wall of the stress relief ring (9) is fixed with suction cotton.

7. A ball screw drive with reverse stop according to claim 1, characterized in that: A bending layer is provided at the connection between the shielding layer (13) and the self-locking seat (3), and the bending layer is made of elastic material.

8. A ball screw drive with reverse stop according to claim 7, characterized in that: The shielding layer (13) is composed of several rigid shielding layers (13) and flexible shielding layers (13) spliced ​​together, and the shielding layer (13) has a trumpet-shaped cross section.

9. A ball screw drive with reverse stop according to claim 1, characterized in that: The self-locking ring (4) is inlaid with an electromagnetic block (17), and the electromagnetic block (17) corresponds to the self-locking groove (5). The self-locking block (7) is inlaid with a magnetic block with the same magnetism as the electromagnetic block (17).

10. A ball screw drive with reverse stop according to claim 1, characterized in that: At least two buffer grooves (11) are provided and symmetrically distributed on the surface of the stress-relieving ring (9). The number of positioning blocks is the same as that of buffer grooves (11). The buffer grooves (11) are set at an angle.

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