Hand wheel sliding table with locking function

Abstract

The application discloses a hand wheel sliding table with locking function, comprising a base, a linear guide rod, a ball screw, a sliding platform and a hand wheel assembly. An annular scale line is arranged on the outer edge of the hand wheel, and a reference line is arranged on the supporting block, so that parallax-free reading is realized by combining the lead and the rotation angle conversion. An eccentric friction type or electromagnetic bolt type first locking mechanism is arranged between the hand wheel and the bearing seat. A second locking mechanism is arranged in the sliding platform, the handle drives the worm gear, the worm and the screw nut assembly, and drives the positioning cylinder to press down and lock in the locking groove of the base. The application adopts double locking mechanism, effectively prevents the displacement of the sliding table and the screw rod, has the advantages of reliable locking, simple operation, no damage to the precision shaft neck and accurate reading.

Description

Technical Field

[0001] This invention relates to the field of precision mechanical transmission and micro-displacement adjustment technology, specifically to a manual linear slide with a double locking mechanism suitable for precision micro-adjustment. Background Technology

[0002] Manual slides are widely used for high-precision micro-displacement adjustments in fields such as optical inspection, semiconductor packaging, medical instruments, and precision machine tools. Existing manual slides typically employ a ball screw and linear guide transmission system, where the user rotates a handwheel at the end to drive the screw, thus achieving minute displacement of the work platform. However, in precision machining and testing, existing manual slides suffer from the following drawbacks: the locking method is simplistic and unreliable, prone to retraction; and the locking operation can easily damage core precision components. Summary of the Invention

[0003] To address the aforementioned shortcomings in the existing technology, this invention provides a hand-cranked wheel slide with a locking function. It aims to solve the following technical problems: 1) solving the problem of insufficient locking force and easy backlash displacement caused by a single locking structure; 2) solving the problem of easy damage to the surface of the precision shaft by the rotating shaft locking mechanism.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A hand-cranked slide with a locking function includes a base, a linear guide rod, a ball screw, a sliding platform, bearing seats, and a hand-cranked wheel assembly. Two bearing seats are fixed to both ends of the base; the linear guide rod is connected to the two bearing seats and is parallel to the base; both ends of the ball screw are rotatably connected to the two bearing seats; the sliding platform is driven by the ball screw via a screw nut, and a sliding hole is provided on the sliding platform, through which it is slidably connected to the linear guide rod. Mounting holes are provided at the four corners of the top surface of the sliding platform for mounting external accessories. The core features of this hand-cranked slide table are as follows: the hand-cranked wheel assembly is coaxially connected to one end of the ball screw for driving the ball screw to rotate; a first locking mechanism is installed between the hand-cranked wheel assembly and its proximal bearing seat, which can lock or unlock the ball screw to lock the hand-cranked wheel assembly at any rotation angle; at the same time, a second locking mechanism that can extend downward is installed inside the sliding platform, which can lock the sliding platform by controlling the second locking mechanism to extend downward and press against the base.

[0006] Furthermore, the handwheel assembly includes a support block and a handwheel body. The support block is U-shaped, with its open end fixedly connected to an adjacent bearing seat. A shaft hole is provided on the side of the support block away from the bearing seat, and a drive shaft is provided at one end of the ball screw. The drive shaft passes through the shaft hole, and its protruding end is fixedly connected to the handwheel body. To facilitate intuitive reading of the displacement by the operator, a first scale line distributed in a circle is engraved on the outer periphery of the handwheel body near the support block. A second scale line is provided on the support block that mates with the first scale line. Adjacent first scale lines represent the step displacement of the sliding platform.

[0007] Furthermore, the present invention provides a first preferred embodiment of the first locking mechanism. The first locking mechanism includes a knob and an annular cylinder coaxially fixed to one side of the knob. The annular cylinder is rotatably connected to a bearing seat at its proximal end via a bearing. An eccentric through-hole is formed on the inner side of the annular cylinder on the knob. A drive shaft is located within the through-hole, and the diameter of the drive shaft is smaller than the diameter of the through-hole. The axis of the drive shaft coincides with the axis of the knob. An arc-shaped friction block that engages with the drive shaft is provided on the inner wall of the through-hole closest to the drive shaft. The outer wall of the knob is provided with anti-slip texture. Its operating principle is as follows: by rotating the knob, the geometric position of the eccentric through-hole changes, causing the friction block to rotate. The gradual reduction of the eccentricity causes the friction block to press tightly against the drive shaft, thus locking the mechanism.

[0008] Furthermore, to further improve the reliability of locking and protect the shaft surface, the friction block is made of polyoxymethylene or polytetrafluoroethylene, and its contact surface with the ball screw rotating shaft is provided with annular V-shaped microgrooves, the cross-sectional angle of which is 60°. These V-shaped microgrooves increase the contact friction coefficient and guide away wear debris, preventing slippage.

[0009] Furthermore, the present invention also provides a second preferred embodiment of the first locking mechanism (electromagnetically controlled). The first locking mechanism includes an external spline disposed on the outer wall of the drive shaft and located between the bearing seat and the support block, a locking sleeve slidably connected to the external spline, a locking block fixed to the side of the locking sleeve facing the bearing seat, a locking groove formed on the bearing seat at the proximal end and opposite to the locking block, and an electromagnet disposed within the bearing seat. Simultaneously, the support block and the locking sleeve are connected by a return spring, which, through the action of the return spring, separates the locking sleeve from the bearing seat at the proximal end. Both the locking sleeve and the locking block are made of ferromagnetic material. When energized, the electromagnet can attract the locking sleeve and the locking block to move axially, causing the locking block to insert into the locking groove. The locking sleeve is simultaneously splined to the external spline, thereby achieving a combination of mechanical locking and electrical control.

[0010] Furthermore, the present invention provides a detailed definition of the second locking mechanism. Two locking grooves are formed along the length of the top surface of the base; receiving grooves are formed on both sides of the bottom surface of the sliding platform. The second locking mechanism includes a transmission rod rotatably connected to the sliding platform and locking units drively connected to the transmission rod. Both ends of the transmission rod extend into the receiving grooves, and worm gears are connected to the extended ends. The two worm gears are drively connected to the two locking units respectively. One end of the transmission rod protrudes from the side of the sliding platform, and a handle is connected to the protruding end. By rotating the transmission rod, the locking units can be driven to move downwards from the receiving grooves and press tightly into the locking grooves, thereby achieving physical limitation of the large-mass sliding platform body.

[0011] Furthermore, the present invention discloses in detail the internal transmission structure of the locking unit. The locking unit includes a lead screw vertically disposed in a receiving groove, a worm gear fixedly connected to the upper end of the lead screw, a nut seat threadedly connected to the lead screw, and a positioning cylinder fixed to the bottom surface of the nut seat. The upper end of the worm gear is rotatably connected to the top wall of the receiving groove, and two worm wheels respectively mesh with two worms. The positioning cylinder is located on the periphery of the lead screw, and a limit block is fixedly connected to the lower end of the lead screw to prevent the positioning cylinder from disengaging from the lead screw. The side wall of the receiving groove is provided with a sliding groove, and the outer wall of the nut seat is provided with a slider that cooperates with the sliding groove. The slider is slidably disposed in the corresponding sliding groove, and the positioning cylinder is located above the corresponding locking groove. By driving the lead screw to rotate, the positioning cylinder is moved downward from the receiving groove and pressed tightly into the locking groove, thereby fixing the sliding platform. This structure utilizes the self-locking characteristics of the worm gear, and can maintain locking without continuous force.

[0012] Furthermore, to ensure the straightness, rigidity, and resistance to eccentric loads of the sliding platform, at least two linear guide rods are provided, symmetrically distributed on both sides of the ball screw. This dual-guide rod layout can effectively overcome the overturning moment caused by unilateral force application, improving the overall stability of the equipment.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. This invention incorporates a first locking mechanism and a second locking mechanism, forming a dual guarantee against both screw rotation and slip table creep. Even under extreme vibration or off-center loading, it ensures absolutely constant displacement accuracy.

[0015] 2. The first locking mechanism uses a flexible plastic clamping block for clamping, which completely solves the problem of traditional set screws damaging precision journals; at the same time, an electromagnetic locking mechanism is provided as an alternative to meet different automation needs. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the present invention;

[0017] Figure 2 This is a schematic diagram of the support block;

[0018] Figure 3 This is a cross-sectional view of the first locking mechanism in Embodiment 1;

[0019] Figure 4 yes Figure 3 Cross-sectional view of the locking unit;

[0020] Figure 5 This is a cross-sectional view of the second locking mechanism;

[0021] Figure 6 This is an exploded view of the operation of the first locking mechanism in Embodiment 1;

[0022] Figure 7 This is a cross-sectional view of the first locking mechanism in Embodiment 2;

[0023] In the diagram, 1-base, 11-locking groove, 2-linear guide rod, 3-ball screw, 31-drive shaft, 4-sliding platform, 41-accommodating groove, 5-bearing seat, 6-hand crank assembly, 61-support block, 62-handwheel body, 63-first scale line, 7-first locking mechanism, 71-knob, 72-ring cylinder, 73-through hole, 74-friction pressure block, 75-external spline, 76-locking sleeve, 77-locking block, 78-electromagnet, 79-reset spring, 710-toggle switch, 8-second locking mechanism, 81-drive rod, 82-worm gear, 83-handle, 84-lead screw, 85-worm gear, 86-nut seat, 87-positioning cylinder, 88-slider. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example 1

[0026] Please refer to Figure 1 This embodiment provides a basic assembly method for a hand-cranked wheel slide with locking function, and discloses in detail the implementation scheme of its eccentric first locking mechanism and worm gear driven second locking mechanism.

[0027] The basic structure of the hand-cranked roller slide table includes a long strip of extruded aluminum alloy profile as a base 1. Two bearing seats 5 are fixed at both ends of the base 1. Two linear guide rods 2 are provided, horizontally and symmetrically connected to the two bearing seats 5 and parallel to the base 1. A high-precision ball screw 3 is installed on the center line of symmetry between the two linear guide rods 2, with both ends of the ball screw 3 rotatably connected to the two bearing seats 5 via deep groove ball bearings.

[0028] The sliding platform 4 straddles the linear guide rod 2 and the ball screw 3. A screw nut is fixed inside the sliding platform 4, and the screw nut and ball screw 3 are driven by a screw thread. Simultaneously, sliding holes adapted to the linear guide rod 2 are provided on both sides of the sliding platform 4, allowing for sliding engagement and restricting the sliding platform 4 to linear motion only along the axial direction. Mounting holes are provided at the four corners of the top surface of the sliding platform 4 for connecting external loads, fixtures, or worktables.

[0029] A hand crank assembly 6 is coaxially mounted at the end of the ball screw 3 that extends beyond the near-end bearing housing 5. The hand crank assembly 6 specifically includes a U-shaped support block 61, the open end of which is fixedly connected to the near-end bearing housing 5 by countersunk bolts. A shaft hole is provided on the outer side of the support block 61, away from the bearing housing. The drive shaft 31 at the end of the ball screw 3 extends outward through this shaft hole, and a handwheel body 62 is press-fitted to the extended end by a flat key or set screw.

[0030] To achieve precise fine-tuning, a first scale line 63, evenly distributed in a circle, is laser-engraved on the annular outer circumference of the handwheel body 62 near the support block 61. Simultaneously, a second scale line for alignment is located in the center of the top surface of the support block 61. When the operator rotates the handwheel body 62, the first scale line 63 rotates accordingly and shifts relative to the second scale line. The angle between adjacent first scale lines 63 corresponds to the precise step displacement of the sliding platform 4 after the ball screw 3 rotates by a specific angle; for example, each division represents 0.01mm. This design allows the operator to directly read the fine-tuning value from the front, eliminating parallax.

[0031] The core principle of this hand-cranked wheel reading design lies in the deep integration of mechanical kinematics, circular geometry, and ergonomics, as detailed below:

[0032] Mechanical kinematics conversion principle: The linear displacement L of the sliding platform 4 depends on the lead P of the ball screw 3 and the rotation angle θ of the handwheel body 62. The two satisfy a linear proportional relationship, and the mathematical formula is:

[0033]

[0034] Taking a ball screw with a lead P=2mm preferred in this embodiment as an example, to achieve a feed rate of 0.01mm per division, the central angle between adjacent first graduations 63 must satisfy the following:

[0035]

[0036] Therefore, a calibration of 0.01 mm can be achieved by etching a line every 1.8° on the outer circumference.

[0037] Unlike traditional scales engraved on the end face, this invention features a first scale line 63 arranged in a ring on the outer peripheral wall of the handwheel body 62. Since the support block 61 is absolutely stationary, when the handwheel rotates, the scale line on the outer surface acts like a dynamic ring ruler, continuously sweeping across the second scale line (reference pointer) fixed to the top of the support block. The operator can visually read the accumulated displacement value by pointing to the reference line indicating which revolution and division has been swept.

[0038] In this embodiment, a first locking mechanism 7 is installed between the hand crank assembly 6 and the proximal bearing seat 5. This mechanism specifically includes a knob 71 with knurled anti-slip texture. An annular cylinder 72 is coaxially fixedly connected to one side of the knob 71, and the annular cylinder 72 is rotatably mounted on the end face of the proximal bearing seat 5 via a deep groove ball bearing.

[0039] The core of this locking mechanism lies in its eccentric design. For example... Figure 3 As shown, an eccentric through hole 73 is provided in the area inside the annular cylinder 72 where the knob 71 is located. The drive shaft 31 passes through this eccentric through hole 73. It is worth noting that the axis of the drive shaft 31 coincides with the overall rotation axis of the knob 71, while the center of the through hole 73 is eccentric to the axis of the knob 71. Since the diameter of the drive shaft 31 is smaller than the diameter of the through hole 73, a gap is left between them. In the inner wall of the through hole 73, on the side closest to the drive shaft 31, an arc-shaped friction block 74 adapted to the outer wall of the drive shaft 31 is fixedly embedded.

[0040] Locking principle: such as Figure 6As shown, when the operator rotates the knurled knob 71 forward, the knob 71 revolves around the axis of the drive shaft 31. As the rotation angle of the knob 71 changes, the eccentric position of the eccentric through hole 73 changes, causing the gap between the inner wall of the through hole 73 and the outer wall of the drive shaft 31 to gradually decrease. When rotated to a specific angle, the reduction in gap caused by eccentricity is converted into positive pressure, causing the arc-shaped friction block 74 to be strongly squeezed and deformed, tightly gripping the surface of the drive shaft 31, thereby achieving flexible locking of the hand crank at any rotation angle. At this time, if the friction block 74 is made of polyoxymethylene (POM) or polytetrafluoroethylene (PTFE), it can avoid hard-on-hard damage to the precision journal. At the same time, the 60° angle of the annular V-shaped microgroove section on its contact surface can effectively increase the friction force, improve the gripping coefficient, and promptly remove the dust generated by friction to prevent slippage. Reversing the rotation of the knob 71 restores the eccentricity and releases the gripping force.

[0041] like Figure 4 and Figure 5 As shown, to resist the slight creep that may occur in the sliding platform 4 under high load or off-center load, the present invention provides an independent second locking mechanism 8 inside the sliding platform 4. The specific structure is as follows:

[0042] On the top surface of the base 1, two rectangular locking grooves 11 are formed along its length. On both sides of the bottom surface of the sliding platform 4, two upward receiving grooves 41 are symmetrically formed.

[0043] The second locking mechanism 8 includes a transmission rod 81 that is laterally rotatably connected inside the sliding platform 4. One end of the transmission rod 81 extends out from the side of the sliding platform 4, and a handle 83 for manual operation is fixed to the protruding end by screws. Worm gears 82 are fixedly installed on the rod body corresponding to the positions of the two receiving slots 41.

[0044] Each receiving slot 41 is equipped with a locking unit. The detailed structure of the locking unit is as follows:

[0045] A lead screw 84 is vertically arranged, and a worm gear 85 is coaxially fixed to the upper end of the lead screw 84. The top end of the worm gear 85 is rotatably supported on the top wall of the receiving groove 41 through a miniature thrust bearing. Two worm wheels 82 on the transmission rod 81 are perpendicularly engaged with the worm gears 85 in the two receiving grooves respectively. A nut seat 86 is screwed onto the outer periphery of the lead screw 84. A vertical guide groove is formed on the inner side wall of the receiving groove. A slider 88 that mates with the groove is fixed to the outer wall of the nut seat 86. The slider 88 is locked in the groove, restricting the nut seat 86 from rotating circumferentially with the lead screw 84.

[0046] A hollow cylindrical positioning cylinder 87 is fixedly connected to the bottom of the nut seat 86, and the positioning cylinder 87 is sleeved around the lead screw 84. A limiting block is threaded or riveted to the bottom end of the lead screw 84 to prevent the positioning cylinder 87 and the nut seat 86 from disengaging from the lead screw 84 when moving upward.

[0047] Locking process: When the operator turns the handle 83, the transmission rod 81 rotates, causing the two worm gears 82 on it to rotate synchronously. The worm gears 82 drive the worm 85 meshing with them to rotate, which in turn drives the vertical lead screw 84 to rotate. Since the nut seat 86 is restricted from rotating by the slider 88, the rotational torque of the lead screw 84 is converted into downward linear motion of the nut seat 86 and the positioning cylinder 87. The positioning cylinder 87 moves downward from the bottom of the receiving groove 41 until its bottom end face is tightly pressed into the locking groove 11 of the base 1. Because the worm gear transmission pair formed by the worm gears 82 and the worm 85 has a very strong self-locking characteristic, once pressed, even if the external force of the handle 83 is removed, the positioning cylinder 87 can still be firmly locked in the locking groove 11 by the self-locking force of the transmission system, so as to absolutely fix the physical position of the sliding platform 4. Rotating the handle 83 in the opposite direction will retract the positioning cylinder 87 and restore normal sliding.

[0048] In summary, the first locking mechanism 7 and the second locking mechanism 8 provide dual protection against screw rotation and slippage. Even under extreme vibration or off-center loading, the displacement accuracy remains absolutely constant.

[0049] Example 2

[0050] As an alternative to the eccentric first locking mechanism in Embodiment 1, in order to meet the needs of automated control or one-button locking, this embodiment provides an electromagnetically controlled first locking mechanism 7 implementation.

[0051] like Figure 7 As shown, this structure is located in the area between the bearing housing 5 and the support block 61. An external spline 75 is machined on the outer wall of the drive shaft 31. A locking sleeve 76 with a corresponding spline groove in its inner hole is fitted onto the external spline 75, allowing the locking sleeve 76 to slide freely axially but not to rotate circumferentially relative to the drive shaft 31. A locking block 77 is bolted to the side of the locking sleeve 76 facing the bearing housing 5. A locking groove matching the contour of the locking block 77 is formed on the end face of the bearing housing 5 near the end. The support block 61 and the locking sleeve 76 are connected by a return spring 79, which, under normal conditions, always pushes the locking sleeve 76 away from the bearing housing 5.

[0052] An electromagnet 78 is embedded inside the bearing housing 5. The locking sleeve 76 and the locking block 77 are both made of ferromagnetic materials such as electrical pure iron.

[0053] When the external control system energizes the electromagnet 78, the electromagnet 78 generates magnetic force, which overcomes the elastic force of the return spring 79, attracting the locking sleeve 76 and the locking block 77 along the axial direction of the drive shaft 31 and pulling them towards the bearing seat 5. At this time, the locking block 77 is precisely inserted into the locking groove, and at the same time, the inner spline of the locking sleeve 76 is tightly engaged with the outer spline 75. The two work together to make the drive shaft 31 completely and rigidly locked. After the power is cut off, the magnetic force disappears, the return spring 79 pushes the locking sleeve 76 and the locking block 77 back to their original positions, the pin disengages, and the lock is released.

[0054] Additionally, a locking toggle switch is installed on one side of the sliding platform 4 along its movement direction. When switched to the "ON" position, the electromagnet remains energized and locked; when switched to the "OFF" position, the power is cut off and the switch is unlocked.

[0055] To ensure the stability of the above actions and adaptability to different scenarios, this embodiment discloses a specific power supply and safety protection scheme:

[0056] Industrial external power supply mode: Powered by a standard DC 24V industrial switching power supply with a rated output current of not less than 1.5A (2A recommended). The power module is installed in an external electrical cabinet and connected to the electromagnet terminals of this slide via an aviation plug.

[0057] Portable Battery Powered Mode: To meet the needs of mobile use in environments without external mains power, this slide supports power supply using a seven-cell (7S) 18650 lithium-ion battery pack (nominal voltage 25.2V, full charge 29.4V). Since the full charge voltage of the battery is higher than the rated operating voltage of the electromagnet, a DC-DC step-down regulator module must be connected in series between the battery pack output and the electromagnet coil to constantly step down the maximum input voltage of 29.4V to 24.0V±0.5V. Simultaneously, a 2200μF / 35V electrolytic capacitor is connected in parallel in the circuit to absorb the reverse induced electromotive force generated during coil switching, protecting circuit components. The battery pack can be installed in a dedicated battery compartment at the rear of base 1.

[0058] Safety protection and status feedback components: An NTC thermistor is connected in series inside the electromagnet coil to achieve overheat protection; a Hall position sensor is installed on the side of the locking groove of the near-end bearing seat 5 to provide real-time feedback on whether the locking block has been successfully inserted into place, and corresponding LED indicator lights can be configured on the slide panel: green light for locking / red light for fault or unlocking to achieve closed-loop monitoring.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hand-cranked wheel slide with locking function, comprising a base (1), a linear guide rod (2), a ball screw (3), a sliding platform (4), bearing seats (5), and a hand-cranked wheel assembly (6); two bearing seats (5) are fixed at both ends of the base (1); the linear guide rod (2) is connected to the two bearing seats (5) and is parallel to the base (1); both ends of the ball screw (3) are rotatably connected to the two bearing seats (5); the sliding platform (4) is driven by the ball screw (3) through a screw nut, the sliding platform (4) has a sliding hole and is slidably connected to the linear guide rod (2) through the sliding hole, and mounting holes are provided at the four corners of the top surface of the sliding platform (4); characterized in that: The hand crank assembly (6) is coaxially connected to one end of the ball screw (3) and is used to drive the ball screw (3) to rotate; A first locking mechanism (7) is installed between the hand crank assembly (6) and its proximal bearing seat (5). The ball screw (3) can be locked or unlocked through the first locking mechanism (7) to lock the hand crank assembly (6) at any rotation angle. The sliding platform (4) is equipped with a second locking mechanism (8) that can extend downward. By controlling the second locking mechanism (8) to extend downward and press against the base (1), the sliding platform (4) can be locked.

2. A hand-cranked roller slide with locking function according to claim 1, characterized in that, The handwheel assembly (6) includes a support block (61) and a handwheel body (62). The support block (61) is U-shaped, and its open end is fixedly connected to the adjacent bearing seat (5). The support block (61) has a shaft hole on the side away from the bearing seat. One end of the ball screw (3) is provided with a drive shaft (31). The drive shaft (31) passes through the shaft hole and the end of the drive shaft (31) is fixedly connected to the handwheel body (62). The outer periphery of the handwheel body (62) near the support block (61) is engraved with a first scale line (63) distributed in a circle. The middle of the top surface of the support block (61) is provided with a second scale line that matches the first scale line (63). The adjacent first scale line (63) represents the step displacement of the sliding platform (4).

3. A hand-cranked wheel slide with locking function according to claim 2, characterized in that, The first locking mechanism (7) includes a knob (71) and an annular cylinder (72) coaxially fixed on one side of the knob. The annular cylinder (72) is rotatably connected to the bearing seat (5) at the near end via a bearing. An eccentric through hole (73) is provided on the inner side of the annular cylinder (72) on the knob (71). The transmission shaft (31) is located in the through hole (73), and the diameter of the transmission shaft (31) is smaller than the diameter of the through hole (73). The axis of the transmission shaft (31) coincides with the axis of the knob (71). An arc-shaped friction block (74) that cooperates with the transmission shaft (31) is provided on the inner wall of the through hole (73) that is closest to the transmission shaft (31). The outer wall of the knob (71) is provided with anti-slip texture. By rotating the knob (71) to drive the friction block (74) to rotate, the friction block (74) can be pressed tightly on the transmission shaft (31).

4. A hand-cranked wheel slide with locking function according to claim 3, characterized in that, The friction block (74) is made of polyoxymethylene or polytetrafluoroethylene. It has an annular V-shaped microgroove on its contact surface with the drive shaft (31). The cross-sectional angle of the V-shaped microgroove is 60°, which is used to increase the friction force.

5. A hand-cranked wheel slide with locking function according to claim 2, characterized in that, The first locking mechanism (7) includes an external spline (75) disposed on the outer wall of the transmission shaft (31) and located between the bearing seat (5) and the support block (61), a locking sleeve (76) slidably connected to the external spline (75), a locking block (77) fixed to the side of the locking sleeve (76) facing the bearing seat, a locking groove opened on the corresponding bearing seat (5) and opposite to the locking block, and an electromagnet (78) disposed in the bearing seat. The support block (61) and the locking sleeve (77) 76) are connected by a return spring (79). The return spring (79) separates the locking sleeve (76) from the bearing seat (5) at the near end. The locking sleeve (76) and the locking block (77) are both made of ferromagnetic material. When the electromagnet (78) is energized, it can attract the locking sleeve (76) and the locking block (77) to move axially so that the locking block (77) can be inserted into the locking groove. The locking sleeve (76) is also splined to the external spline (75).

6. A hand-cranked wheel slide with locking function according to claim 1, characterized in that, The base (1) has two locking grooves (11) along its length on its top surface; the sliding platform (4) has receiving grooves (41) on both sides of its bottom surface. The second locking mechanism (8) includes a transmission rod (81) rotatably connected to the sliding platform (4) and a locking unit tractively connected to the transmission rod (81). Both ends of the transmission rod (81) extend into the receiving groove (41), and the extended ends are connected to worm gears (82). The two worm gears (82) are tractively connected to the two locking units respectively. One end of the transmission rod (81) protrudes from the side of the sliding platform (4), and the protruding end is connected to a handle (83). By rotating the transmission rod (81), the locking unit can be driven to move downward from the receiving groove (41) and press tightly into the locking groove (11).

7. A hand-cranked wheel slide with locking function according to claim 6, characterized in that, The locking unit includes a lead screw (84) vertically disposed in a receiving groove (41), a worm gear (85) fixedly connected to the upper end of the lead screw, a nut seat (86) threadedly connected to the lead screw, and a positioning cylinder (87) fixed to the bottom surface of the nut seat. The upper end of the worm gear (85) is rotatably connected to the top wall of the receiving groove (41). Two worm wheels (82) respectively mesh with the two worm gears (85). The positioning cylinder (87) is located around the lead screw (84), and the lower end of the lead screw (84) is fixed. A fixed connection limit block is used to prevent the positioning cylinder (87) from detaching. The side wall of the receiving groove (41) is provided with a sliding groove. The outer wall of the nut seat (86) is provided with a slider (88) that cooperates with the sliding groove. The slider (88) is slidably set in the corresponding sliding groove. The positioning cylinder (87) is located above the corresponding locking groove (11). By rotating the drive screw (84), the positioning cylinder (87) is moved downward from the receiving groove (41) and pressed tightly in the locking groove (11) to fix the sliding platform (4).

8. A hand-cranked wheel slide with locking function according to claim 1, characterized in that, At least two linear guide rods (2) are provided and are symmetrically distributed on both sides of the ball screw (3).

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