A fastener for calibrating and adjusting the gap of automobile parts assembly

Abstract

The invention discloses a fastener for calibrating and adjusting the gap of automobile parts assembly, which relates to the technical field of automobile parts assembly, and includes a screw and a nut. The fastener for calibrating and adjusting the gap of automobile parts assembly can drive two driven gears to rotate through a driving rod when the gap calibration of automobile parts is completed, so that the upper and lower groups of symmetrically arranged slide cylinders move away from each other to move in the gap between two automobile parts, and simultaneously fit and extrude the side surfaces of the two automobile parts that are close to each other, and cooperate with the arrangement of two nuts, so that the inner and outer surfaces of the two automobile parts can be doubly fixed, and in the process of moving away, the extension rod in the storage groove can be brought out for cooperative extrusion, thereby increasing the extrusion area and avoiding excessive extrusion force on the local inner surface of the automobile part, thereby facilitating the improvement of the installation fastening when using the fastener, and ensuring the driving safety of the automobile.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts assembly, in particular to a fastener for calibrating and adjusting the assembly gap of automobile parts. Background Art

[0002] Fasteners refer to a type of mechanical parts used for fastening and connection and are extremely widely used. They are usually used to fasten two or more parts (or components) together to form a whole. They are widely used in industries including electronics, energy, electrical appliances, machinery, chemicals, etc. When assembling automotive parts, the assembly gap refers to the reasonable gap set during the design and manufacturing process to ensure the smooth assembly of parts. This gap allows a certain amount of room for movement between parts to ensure that they can move and install normally.

[0003] During the actual assembly of automobile parts, excessive assembly clearance may lead to increased friction, wear and vibration between parts, thus affecting the overall performance and reliability of the vehicle equipment, while too small a clearance may cause jamming or excessive wear between parts, which also has an adverse effect on the performance of the automobile equipment. Therefore, during assembly, bolts, nuts and other fasteners are used to adjust the positional relationship between fixed parts to ensure the driving safety of the vehicle. However, due to the gaps between parts, when the vehicle is driving, the vehicle suspension system may vibrate frequently due to the influence of road conditions and other factors, and the automobile parts may move relative to the bolts and nuts, resulting in changes in the clearance between parts, making it impossible to ensure the driving safety of the vehicle. Summary of the invention

[0004] The object of the present invention is to provide a fastener for calibrating and adjusting the assembly gap of automobile parts to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fastener for calibrating and adjusting the gap of automobile parts assembly, comprising a screw rod and a nut, wherein two nuts are threadedly connected to the outer walls at both ends of the screw rod, and an inner groove is provided inside the screw rod, a driving rod is rotatably connected to the inner wall of the inner groove, and a driving gear is fixedly connected to the middle outer wall of the driving rod, and a slide groove is symmetrically provided through both sides of the screw rod;

[0006] The inner wall of the first slide groove is provided with a fastening and anti-slipping mechanism, so as to fit and squeeze the adjacent side surfaces of the two automobile parts when the assembly gap is adjusted;

[0007] The inner wall of the first slide groove is provided with an auxiliary mechanism, so as to automatically complete the squeezing and locking of the driving rod when the inner side surface of the automobile part is fixed.

[0008] Preferably, the fastening and anti-slip mechanism includes a rotating rod 1, and the two ends of the rotating rod 1 are rotatably connected to the inner wall of the slide groove 1, the middle outer wall of the rotating rod 1 is fixedly connected to a driven gear corresponding to the driving gear, and a side wall of the driven gear is meshed and matched with a side wall of the driving gear, the outer wall thread of the rotating rod 1 is oppositely arranged with the driven gear as the mid-vertical line, and the outer wall of the rotating rod 1 is equidistantly threadedly connected to a base, the two side outer walls of the base are fitted and slid with the inner wall of the slide groove 1, and the two side outer walls of the base are provided with side grooves, the inner wall of the side groove is fitted and slidably connected with a slide cylinder, and the outer walls of the two slide cylinders that are far away from each other are fitted and slid with the inner wall of the slide groove 1.

[0009] Preferably, a block is fixedly connected to the bottom of the slide cylinder, and the block has a T-shaped appearance. A slot is provided on the inner wall of the side groove corresponding to the block, and the outer wall of the block slides in contact with the inner wall of the slot. A spring is fixedly connected to a side wall of the block away from the driving rod, and the other end of the spring is fixedly connected to the inner wall of the slot.

[0010] Preferably, the slide cylinder forms a telescopic structure through a block and a spring, and one end of the slide cylinder facing the driving rod is squeezed and set on the outer wall of the driving rod by a spring, the outer wall of the driving rod is symmetrically fixedly connected with an extension slide column corresponding to the base, and the outer wall of the extension slide column rotates in fit with the inner wall of the inner groove, the bottom of the extension slide column is fixedly connected with a guide slide plate, and the inside of the guide slide plate is fixedly connected to the outer wall of the driving rod, and the bottom of the guide slide plate is truncated cone-shaped corresponding to the slide cylinder.

[0011] Preferably, the outer walls on both sides of one end of the slide cylinder away from the driving rod are fixedly connected with an extension rod, the outer wall of the screw rod is provided with a storage groove corresponding to the extension rod, and the outer wall of the extension rod is fitted with the inner wall of the storage groove, and the side wall where the two slide cylinders are close to each other is provided with a cavity corresponding to the auxiliary mechanism.

[0012] Preferably, the auxiliary mechanism includes a fixed block, and the outer wall of the fixed block is fixedly connected to the inner wall of the cavity, the internal thread of the fixed block is connected to a rotating rod 2, and the outer wall of an end of the rotating rod 2 away from the driving rod is fixedly connected to a connecting gear, a side wall of the two slide cylinders close to each other is correspondingly provided with a sliding groove 2, and the inner wall of the sliding groove 2 is slidably connected with a movable plate, and the two side walls of the movable plate are provided with tooth grooves corresponding to the connecting gear, and the inner wall of the tooth groove is meshed and matched with the gear teeth of the connecting gear.

[0013] Preferably, the top of the movable plate is fixedly connected with a pressure rod, and the bottom of the pressure rod is symmetrically fixedly connected with a second spring, the other end of the second spring is fixedly connected to the top of the slide cylinder, and the movable plate forms a telescopic structure through the pressure rod and the second spring.

[0014] Preferably, a rubber pressing block is threadedly connected to the outer wall of one end of the rotating rod facing the driving rod, and the outer wall of the rubber pressing block slides in contact with the inner wall of the cavity, and the end of the rubber pressing block facing the driving rod is in contact with the outer wall of the driving rod.

[0015] Preferably, a rotating groove is opened on the middle inner wall of the inner groove corresponding to the driving gear, a connecting head is provided at one end of the screw, and a clamping notch is provided at one end of the connecting head, and the other end of the connecting head passes through the interior of the screw and is fixedly connected to one end of the driving rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When the gap calibration of the automobile parts is completed, the two driven gears can be driven to rotate by the driving rod, so that the upper and lower groups of symmetrically arranged slide cylinders move away from each other to move in the gap between the two automobile parts, and simultaneously fit and extrude the side surfaces of the two automobile parts that are close to each other, and cooperate with the setting of the two nuts, so that the inner and outer surfaces of the two automobile parts can be doubly fixed, and the gap between the automobile parts can be locked. In the process of moving away, the extension rod in the storage groove can be brought out for cooperative extrusion, thereby increasing the extrusion area and avoiding excessive extrusion force on the local inner surface of the automobile part, which is beneficial to improve the installation tightness when using the fastener and ensure the driving safety of the car.

[0018] 2. When the clearance calibration of automobile parts is completed, the rubber pressure block close to the driving rod can be synchronously driven to move when the slides move away from each other. When the slides fit the side of the two automobile parts close to each other, the pressure rod can be squeezed, so that the rubber pressure block gradually fits and squeezes the driving rod. When the inner side of the automobile part is fixed, the driving rod is automatically squeezed and locked to avoid accidental loosening of the driving rod, which is beneficial to improve the installation stability of the fastener when it is used. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure inside the screw of the present invention;

[0021] Figure 3 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the first part of the fastening and anti-slipping mechanism of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the second part of the fastening and anti-slipping mechanism of the present invention;

[0024] Figure 6 It is a structural schematic diagram of the auxiliary mechanism of the present invention.

[0025] In the figure: 1. screw rod; 2. nut; 3. inner groove; 4. driving rod; 5. driving gear; 6. slide groove 1; 9. storage groove; 10. cavity; 11. slide groove 2; 12. rotating groove; 13. connector; 7. fastening and anti-slip mechanism; 701. rotating rod 1; 702. driven gear; 703. base; 704. side groove; 705. slide cylinder; 706. block; 707. slot; 708. spring 1; 709. extension slide column; 710. guide slide plate; 711. extension rod; 8. auxiliary mechanism; 801. fixed block; 802. rotating rod 2; 803. connecting gear; 804. moving plate; 805. tooth groove; 806. pressure rod; 807. spring 2; 808. rubber pressure block. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] For example, see Figure 1-6 The present invention provides a fastener for calibrating and adjusting the gap of automobile parts assembly, comprising a screw rod 1 and a nut 2. The two nuts 2 are threadedly connected to the outer walls at both ends of the screw rod 1, and an inner groove 3 is provided inside the screw rod 1. A driving rod 4 is rotatably connected to the inner wall of the inner groove 3, and a driving gear 5 is fixedly connected to the middle outer wall of the driving rod 4. A slide groove 6 is symmetrically penetrated on both sides of the screw rod 1.

[0028] The inner wall of the slide groove 6 is provided with a fastening and anti-slip mechanism 7.

[0029] Furthermore, the fastening anti-slip mechanism 7 includes a rotating rod 701, and the two ends of the rotating rod 701 are rotatably connected to the inner wall of the slide groove 6, the middle outer wall of the rotating rod 701 is fixedly connected to the driven gear 702 corresponding to the driving gear 5, and one side wall of the driven gear 702 is meshed and matched with the one side wall of the driving gear 5, the outer wall thread of the rotating rod 701 is oppositely arranged with the driven gear 702 as the mid-vertical line, and the outer wall of the rotating rod 701 is equidistantly threadedly connected to the base 703, the outer walls of the two sides of the base 703 are fitted and slid with the inner wall of the slide groove 6, and the outer walls of the two sides of the base 703 are provided with side grooves 704, the inner wall of the side groove 704 is fitted and slidably connected with a slide cylinder 705, and the outer walls of the two slide cylinders 705 that are far away from each other are fitted and slid with the inner wall of the slide groove 6;

[0030] In this embodiment, when the fastener is used, the screw rod 1 is first passed through the holes opened in the two automobile parts, and then two nuts 2 are screwed in from both ends of the screw rod 1 to squeeze and fix the side surfaces of the two automobile parts that are away from each other, and adjust the gap between the automobile parts.

[0031] Then, when the gap adjustment is completed, a connecting head 13 is provided through one end of the screw rod 1, and a clamping notch is provided at one end of the connecting head 13, and the other end of the connecting head 13 passes through the interior of the screw rod 1 and is fixedly connected to one end of the driving rod 4, so that a rotating member matched with the notch of the connecting head 13 can be taken out to rotate the connecting head 13, so that the connecting head 13 can drive the driving rod 4 to rotate, and then a driving gear 5 is fixedly connected through the middle outer wall of the driving rod 4, and a slide groove 6 is symmetrically penetrated on both sides of the screw rod 1, and the two ends of the rotating rod 701 are rotatably connected to the inner wall of the slide groove 6, and at the same time, a driven gear 702 is fixedly connected to the middle outer wall of the rotating rod 701 corresponding to the driving gear 5, and a side wall of the driven gear 702 is meshed and matched with a side wall of the driving gear 5, so that the driving gear 5 can be driven to rotate by the driving rod 4, and then the two driven gears 702 are used to drive the two rotating rods 701 to rotate.

[0032] Then, the outer wall thread of the rotating rod 701 is arranged oppositely with the driven gear 702 as the mid-vertical line, and the outer wall of the rotating rod 701 is equidistantly threadedly connected to the base 703, and the outer walls of the base 703 on both sides slide in contact with the inner wall of the slide groove 6, and at the same time, the outer walls of the base 703 on both sides are provided with side grooves 704, and the inner wall of the side groove 704 is slidably connected with a slide cylinder 705, and the outer wall of the side away from the two slide cylinders 705 slides in contact with the inner wall of the slide groove 6, so that the base 703 can be restricted by the slide groove 6, so that When the rotating rod 1 701 rotates, the two bases 703 can be synchronously driven to move away from or close to each other, so that the upper and lower bases 703 on both sides of the screw rod 1 can move away from each other and move toward the side where the two auto parts are close to each other through the rotation of the rotating rod 1 701, so that the upper and lower two groups of symmetrically arranged slide cylinders 705 can fit and extrude the side where the two auto parts are close to each other, and cooperate with the arrangement of the two nuts 2, so that the inner and outer surfaces of the two auto parts can be doubly fixed, and the gap between the auto parts can be locked;

[0033] Next, in order to improve the extrusion effect and avoid the extrusion point being too small and the extrusion force being too large, which causes the local inner surface of the automobile part to be subjected to excessive extrusion force, a block 706 is fixedly connected to the bottom of the slide 705, and the shape of the block 706 is T-shaped, and the inner wall of the side groove 704 is provided with a slot 707 corresponding to the block 706, and at the same time, the outer wall of the block 706 slides in contact with the inner wall of the slot 707, and a spring 708 is fixedly connected to a side wall of the block 706 away from the driving rod 4, and the other end of the spring 708 is fixedly connected to the inner wall of the slot 707, and at the same time, the slide 705 forms a telescopic structure with the spring 708 through the block 706, and one end of the slide 705 toward the driving rod 4 is squeezed by the spring 708 on the outer wall of the driving rod 4. Wall, so that in a normal state, that is, when the drive rod 4 is not rotated, one end of the multiple slides 705 will be fitted on the outer wall of the drive rod 4 under the drive of the spring 708. When the slides 705 move away from each other, the outer wall of the drive rod 4 is symmetrically fixedly connected with the base 703, and the outer wall of the extension slide 709 is fitted and rotated with the inner wall of the inner groove 3, and the bottom of the extension slide 709 is fixedly connected with a guide slide 710, and at the same time, the inside of the guide slide 710 is fixedly connected to the outer wall of the drive rod 4, and the bottom of the guide slide 710 is truncated cone-shaped corresponding to the slide 705, so that the slide 705 can be squeezed and guided by the inclined surface of the guide slide 710, so that the multiple slides 705 move from the inside of the screw 1 to the outside.

[0034] Then, the extension rod 711 is fixedly connected to the outer walls of both sides of the end of the slide 705 away from the driving rod 4, and the outer wall of the screw 1 is provided with a receiving groove 9 corresponding to the extension rod 711, and the outer wall of the extension rod 711 is matched with the inner wall of the receiving groove 9, so that when the multiple slides 705 move away from each other, the extension rod 711 can be synchronously driven to slide out of the receiving groove 9, and under the guidance of the extension slide column 709, the extension rod 711 can keep sliding out and move, so as to cooperate and squeeze, increase the squeezing area, avoid excessive squeezing force on the local inner surface of the automobile parts, and thus help to improve the installation tightness when using the fastener;

[0035] As described above, when the gap calibration of the automobile parts is completed, the two driven gears 702 can be driven to rotate by the driving rod 4, so that the upper and lower groups of symmetrically arranged slide cylinders 705 move away from each other to move in the gap between the two automobile parts, and simultaneously fit and extrude the side surfaces of the two automobile parts that are close to each other, and cooperate with the setting of the two nuts 2, so that the inner and outer surfaces of the two automobile parts can be doubly fixed, and the gap between the automobile parts can be locked. In the process of moving away, the extension rod 711 in the storage groove 9 can be brought out for cooperative extrusion, thereby increasing the extrusion area and avoiding excessive extrusion force on the local inner surface of the automobile part, which is beneficial to improve the installation tightness when using the fastener and ensure the safety of automobile driving.

[0036] Embodiment 2: Based on the above embodiment, an auxiliary mechanism 8 is provided on the inner wall of the slide groove 6 .

[0037] Furthermore, the auxiliary mechanism 8 includes a fixed block 801, and the outer wall of the fixed block 801 is fixedly connected to the inner wall of the cavity 10, the internal thread of the fixed block 801 is connected to the rotating rod 802, and the outer wall of the end of the rotating rod 802 away from the driving rod 4 is fixedly connected to the connecting gear 803, and the side wall where the two slide cylinders 705 are close to each other is correspondingly provided with a sliding groove 11, and the inner wall of the sliding groove 11 is slidably connected with a movable plate 804, and the two side walls of the movable plate 804 are provided with tooth grooves 805 corresponding to the connecting gear 803, and the inner wall of the tooth groove 805 is meshed and matched with the gear teeth of the connecting gear 803.

[0038] In this embodiment, when the slides 705 move away from each other, a cavity 10 is opened on the auxiliary mechanism 8 corresponding to the side wall of the two slides 705 that are close to each other, and the outer wall of the fixed block 801 is fixedly connected to the inner wall of the cavity 10, and the internal thread of the fixed block 801 is connected to the second rotating rod 802, and at the same time, the outer wall of the end of the second rotating rod 802 away from the driving rod 4 is fixedly connected to the connecting gear 803, and the side wall of the two slides 705 that are close to each other is correspondingly opened with a second sliding groove 11, and the inner wall of the second sliding groove 11 is slidably connected with a moving plate 804, and at the same time, the two side walls of the moving plate 804 are opened with tooth grooves 805 corresponding to the connecting gear 803, and the inner wall of the tooth groove 805 is meshed and matched with the gear teeth of the connecting gear 803, so that when the slides 705 move away from each other, the moving plate 804 will be synchronously driven to move;

[0039] When the slide 705 is in contact with one side of the two automobile parts, a pressure rod 806 is fixedly connected to the top of the movable plate 804, and a spring 807 is symmetrically fixedly connected to the bottom of the pressure rod 806, and the other end of the spring 807 is fixedly connected to the top of the slide 705. At the same time, the movable plate 804 forms a telescopic structure with the spring 807 through the pressure rod 806. Therefore, under normal circumstances, the current height of the movable plate 804 is controlled by the spring 807, so that the height range of the movable plate 804 is greater than the range of the slide 705. That is, when the pressure rod 806 contacts the side of the two automobile parts, the slide 705 has not yet pressed the inner side of the automobile parts. The side of the automobile part that is close to each other is pressed against the pressure rod 806, so that the pressure rod 806 moves, so that the two connecting gears 803 can be driven to rotate through the tooth groove 805, so that the second rotating rod 802 rotates synchronously. At this time, a rubber pressure block 808 is threadedly connected to the outer wall of one end of the second rotating rod 802 toward the driving rod 4, and the outer wall of the rubber pressure block 808 is fitted and slid with the inner wall of the cavity 10, and the end of the rubber pressure block 808 toward the driving rod 4 is fitted with the outer wall of the driving rod 4, so that the second rotating rod 802 can drive the rubber pressure block 808 to gradually squeeze and fit the driving rod 4, so that when the inner side of the automobile part is fixed, the driving rod 4 can be squeezed and locked by the rubber pressure block 808;

[0040] As described above, when the gap calibration of the automobile parts is completed, the rubber pressure block 808 close to the drive rod 4 can be synchronously driven to move when the slide cylinders 705 move away from each other. When the slide cylinder 705 is in contact with the side surface of the two automobile parts, the pressure rod 806 can be squeezed, so that the rubber pressure block 808 gradually fits and squeezes the drive rod 4. When the fixation of the inner side of the automobile part is completed, the drive rod 4 is automatically squeezed and locked, avoiding the accidental loosening of the drive rod 4 later, which is beneficial to improving the installation stability of the fastener when it is used.

[0041] Working principle: First, the screw rod 1 is passed through the holes opened in the two auto parts, and then two nuts 2 are screwed in from both ends of the screw rod 1 to squeeze and fix the two auto parts on the side away from each other, and adjust the gap between the auto parts. When the gap adjustment is completed, the rotating part matched with the notch of the connector 13 can be taken out to rotate the connector 13, so that the connector 13 can drive the driving rod 4 to rotate;

[0042] Then, the driving gear 5 is driven to rotate by the driving rod 4, and then the two driven gears 702 are used to drive the two rotating rods 1 701 to rotate, and the base 703 is restricted by the slide groove 1 6, so that when the rotating rod 1 701 rotates, the two bases 703 can be synchronously driven to move away from or close to each other, so that the upper and lower bases 703 on both sides of the screw rod 1 can move away from each other and move toward the side where the two automobile parts are close to each other through the rotation of the rotating rod 1 701, so that the upper and lower two groups of symmetrically arranged slide cylinders 705 can fit and extrude the side where the two automobile parts are close to each other, and cooperate with the arrangement of the two nuts 2, so that the inner and outer surfaces of the two automobile parts can be doubly fixed, and the gap between the automobile parts can be locked;

[0043] Then, in a normal state, that is, when the driving rod 4 is not rotated, one end of the plurality of slide cylinders 705 will be attached to the outer wall of the driving rod 4 under the drive of the spring 1 708. When the slide cylinders 705 move away from each other, the inclined surface of the guide slide plate 710 can be used to squeeze and guide the slide cylinders 705, so that the plurality of slide cylinders 705 move outward from the inside of the screw rod 1, and synchronously drive the extension rod 711 to slide out of the storage groove 9, and under the guidance of the extension slide column 709, the extension rod 711 can keep sliding out and move, thereby performing cooperative extrusion, increasing the extrusion area, and preventing the inner surface of the automobile parts from being subjected to excessive extrusion force.

[0044] Next, when the slide 705 is in contact with the side surface of the two automobile parts, the pressure rod 806 is squeezed through the side surface of the two automobile parts, so that the pressure rod 806 moves, thereby driving the two connecting gears 803 to rotate through the tooth groove 805, so that the rotating rod 802 rotates synchronously, and then the rotating rod 802 can drive the rubber pressure block 808 to gradually squeeze and fit the driving rod 4, so that when the inner side of the automobile parts is fixed, the driving rod 4 can be squeezed and locked by the rubber pressure block 808.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fastener for calibrating and adjusting the gap of automobile parts assembly, comprising a screw (1) and a nut (2), characterized in that: The two nuts (2) are threadedly connected to the outer walls of both ends of the screw rod (1), and an inner groove (3) is provided inside the screw rod (1). The inner wall of the inner groove (3) is rotatably connected to a driving rod (4), and the middle outer wall of the driving rod (4) is fixedly connected to a driving gear (5). A sliding groove (6) is symmetrically provided on both sides of the screw rod (1); The inner wall of the first slide groove (6) is provided with a fastening and anti-slipping mechanism (7) so as to fit and extrude the adjacent side surfaces of the two automobile parts when the assembly gap is adjusted; The inner wall of the first slide groove (6) is provided with an auxiliary mechanism (8) to automatically complete the squeezing and locking of the driving rod (4) when the inner side surface of the automobile part is fixed; The fastening and anti-slipping mechanism (7) comprises a rotating rod (701), and the two ends of the rotating rod (701) are rotatably connected to the inner wall of the slide groove (6); the middle outer wall of the rotating rod (701) is fixedly connected to a driven gear (702) corresponding to the driving gear (5), the outer wall threads of the rotating rod (701) are arranged oppositely with the driven gear (702) as the mid-vertical line, and the outer wall of the rotating rod (701) is equidistantly threadedly connected to a base (703); the outer walls of both sides of the base (703) are fitted and slidably connected to the inner wall of the slide groove (6), and the outer walls of both sides of the base (703) are provided with side grooves (704), and the inner walls of the side grooves (704) are fitted and slidably connected to the sliding grooves (704). The outer walls of the two sliding cylinders (705) that are away from each other are fitted and slid with the inner wall of the sliding groove (6); one side wall of the driven gear (702) is meshed and matched with the side wall of the driving gear (5); one end of the screw rod (1) is provided with a connector (13), and one end of the connector (13) is provided with a snap-fit ​​notch, and the other end of the connector (13) passes through the interior of the screw rod (1) and is fixedly connected to one end of the driving rod (4); a clamping block (706) is fixedly connected to the bottom of the sliding cylinder (705), and the outer shape of the clamping block (706) is T-shaped, and the inner wall of the side groove (704) is provided with a clamping groove (706) corresponding to the clamping block (706). 7), and the outer wall of the block (706) is fitted and slid with the inner wall of the slot (707), and a side wall of the block (706) away from the driving rod (4) is fixedly connected to a spring 1 (708), and the other end of the spring 1 (708) is fixedly connected to the inner wall of the slot (707); the slide cylinder (705) forms a telescopic structure through the block (706) and the spring 1 (708), and one end of the slide cylinder (705) facing the driving rod (4) is squeezed and set on the outer wall of the driving rod (4) through the spring 1 (708), and the outer wall of the driving rod (4) is symmetrically fixedly connected to an extension slide column (709) corresponding to the base (703), and the outer wall of the extension slide column (709) is aligned with the inner slot. (3) are fitted and rotated, the bottom of the extension slide column (709) is fixedly connected to a guide slide plate (710), and the inside of the guide slide plate (710) is fixedly connected to the outer wall of the driving rod (4), and the bottom of the guide slide plate (710) corresponds to the slide cylinder (705) in a truncated cone shape; the outer walls of the slide cylinder (705) on both sides of the end away from the driving rod (4) are fixedly connected to an extension rod (711), the outer wall of the screw rod (1) corresponds to the extension rod (711) and is provided with a storage groove (9), and the outer wall of the extension rod (711) is fitted and matched with the inner wall of the storage groove (9), and the side wall of the two slide cylinders (705) close to each other is provided with a cavity (10) corresponding to the auxiliary mechanism (8);The auxiliary mechanism (8) comprises a fixed block (801), and the outer wall of the fixed block (801) is fixedly connected to the inner wall of the cavity (10); the internal thread of the fixed block (801) is connected to the second rotating rod (802), and the outer wall of the end of the second rotating rod (802) away from the driving rod (4) is fixedly connected to the connecting gear (803); the side wall of the two slide cylinders (705) close to each other is correspondingly provided with a second sliding groove (11), and the inner wall of the second sliding groove (11) is slidably connected with a moving plate (804); the two side walls of the moving plate (804) are correspondingly provided with tooth grooves (805) corresponding to the connecting gear (803), and the inner wall of the tooth groove (805) is meshed and matched with the gear teeth of the connecting gear (803); the moving plate (804) is provided with a tooth groove (805) on each side wall thereof. A pressure rod (806) is fixedly connected to the top, and a spring 2 (807) is symmetrically fixedly connected to the bottom of the pressure rod (806); the other end of the spring 2 (807) is fixedly connected to the top of the slide cylinder (705), and the movable plate (804) forms a telescopic structure with the spring 2 (807) through the pressure rod (806); a rubber pressure block (808) is threadedly connected to the outer wall of one end of the rotating rod 2 (802) facing the driving rod (4), and the outer wall of the rubber pressure block (808) is fitted and slid with the inner wall of the cavity (10), and the end of the rubber pressure block (808) facing the driving rod (4) is fitted with the outer wall of the driving rod (4); a rotating groove (12) is opened on the middle inner wall of the inner groove (3) corresponding to the driving gear (5). ;

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