Bench drill structure

Abstract

The invention provides a bench drill structure which comprises a main body, a workbench, a power motor and a drill bit assembly, a power shaft of the power motor is fixedly connected with a first driving wheel, the first driving wheel is provided with a plurality of first gear grooves which are coaxially arranged, the inner diameters of the first gear grooves are sequentially increased from top to bottom, the drill bit assembly is connected with a second driving wheel, and the second driving wheel is connected with the workbench. A plurality of coaxially arranged second gear grooves are formed in the second driving wheel, the inner diameters of the second gear grooves are sequentially increased from top to bottom, a third driving wheel is rotationally connected to the main body, the axes of the first driving wheel, the second driving wheel and the third driving wheel are parallel, and the third driving wheel is located between the first driving wheel and the second driving wheel; and a plurality of third gear grooves are formed in the third driving wheel, the inner diameters of the third gear grooves are sequentially reduced from top to bottom, the first gear grooves are connected with the third gear grooves through first belts, the second gear grooves are connected with the third gear grooves through second belts, and the purpose of improving practicability is achieved.

Description

Technical Field

[0001] The invention relates to the field of drilling mechanical equipment, in particular to a bench drill structure. Background Art

[0002] At present, a Chinese patent with authorization announcement number CN203003196U discloses a drilling machine, including a machine base, a support arm connected to the machine base, a cantilever connected to the top of the support arm, and an electric motor installed on the cantilever, and a drill bit connected by a belt and a pulley. The machine base is provided with a guide rail, and a slider is installed on the guide rail. The top of the slider is fixedly connected to the support arm. The support arm is a hydraulic cylinder I and a hydraulic cylinder II connected by a hinge at the head of a piston rod.

[0003] This drilling machine has the advantages of simple structure, easy manufacturing, and can complete hole processing in multiple positions and directions with one clamping.

[0004] However, existing drilling machines usually have only a few gears, that is, a few coaxial gear slots are provided on the pulley connected to the motor, and the inner diameters of these gear slots decrease from bottom to top. The faster the belt is hung in the upper gear slot, the faster the drill speed will be. Therefore, the drilling speed adjustment range of the drill bit is small and the practicality is not high. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a bench drill structure, which expands the drilling speed adjustment range by setting a third driving wheel to achieve the purpose of improving practicality.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a bench drill structure, including a main body, a workbench, a power motor, and a drill assembly, the workbench is fixed on the main body and located below the drill assembly, the drill assembly and the power motor are both arranged on the main body, a first driving wheel is fixedly connected to the power shaft of the power motor, a plurality of first gear slots arranged coaxially are opened on the first driving wheel, and the inner diameters of the plurality of first gear slots increase from top to bottom, a second driving wheel is connected to the drill assembly, a plurality of second gear slots arranged coaxially are opened on the second driving wheel, and the inner diameters of the plurality of second gear slots increase from top to bottom, a third driving wheel is rotatably connected to the main body, the axes of the first driving wheel, the second driving wheel, and the third driving wheel are parallel, the third driving wheel is located between the first driving wheel and the second driving wheel, a plurality of third gear slots arranged coaxially are opened on the third driving wheel, and the inner diameters of the plurality of third gear slots decrease from top to bottom, the first gear slot and the third gear slot are connected by a first belt, and the second gear slot and the third gear slot are connected by a second belt.

[0007] To implement the above technical solution, the first belt is connected to the first gear slot located above and the third gear slot located above to reduce the speed of the third drive wheel, and the second belt is connected to the third gear slot located below and the second gear slot located below to further reduce the speed of the second drive wheel. This allows the second drive wheel to have a wider speed reduction range to adapt to different production needs, thereby achieving the purpose of improving practicality.

[0008] As a preferred solution of the present invention, a support shaft is connected to the main body, the axis of the support shaft is parallel to the axis of the third driving wheel, a cross bar is connected to the support shaft, the third driving wheel is rotatably connected to the end of the cross bar away from the support shaft, and an adjustment shaft is rotatably connected to the side wall of the main body, the adjustment shaft rotates and moves the support shaft along the axial direction of the support shaft through the adjustment component.

[0009] To implement the above technical solution, the support shaft is rotated and the support shaft is moved along its own length direction through the adjusting component, so that the height position of the third drive wheel can be adjusted. After the third drive wheel moves up, the first gear slot located at the top can be connected to the third gear slot located at the bottom through the first belt, so that the third drive wheel is accelerated. At the same time, the third gear slot located in the middle can be connected to the second gear slot located at the top through the second belt, so that the second drive wheel can be further accelerated, so that the second drive wheel has more speed-up range; similarly, after the third drive wheel moves down, the second drive wheel can have more speed reduction range to adapt to different production needs and achieve the purpose of improving practicality.

[0010] As a preferred solution of the present invention, the adjustment component includes a slide groove, a slide rod, a screw sleeve, a first gear and a second gear. The slide groove is opened on the outer wall of the support shaft, and the length direction of the slide groove is parallel to the axial direction of the support shaft. One end of the slide rod is fixed to the main body, and the other end of the slide rod is slidably connected to the slide groove. The support shaft is inserted into the screw sleeve and is threadedly connected to the screw sleeve. The screw sleeve is rotatably connected to the main body. The first gear is fixed on the outer wall of the screw sleeve and is coaxially arranged with the screw sleeve. The second gear is fixed on the adjusting shaft and is coaxially arranged with the adjusting shaft. The first gear is meshed with the second gear.

[0011] To implement the above technical solution, the adjusting shaft is rotated, the adjusting shaft drives the second gear to rotate, the second gear drives the first gear to rotate, and the first gear drives the screw sleeve to rotate. Through the conduction effect of the thread, the support shaft moves along the slide groove in its own length direction, so that the height position of the support shaft can be adjusted, that is, the height position of the third drive wheel can be adjusted, and the third drive wheel can be limited by the self-locking property of the thread.

[0012] As a preferred solution of the present invention, the cross bar is rotatably connected to the support shaft, a fixing sleeve is fixedly connected to the cross bar, the fixing sleeve is arranged on the outside of the support shaft, a locking shaft is rotatably connected to the outer wall of the main body, and the locking shaft rotates and causes the fixing sleeve to rotate along the axis of the support shaft through a transmission component.

[0013] To implement the above technical solution, the locking shaft is rotated to make the fixed sleeve rotate along the axis of the support shaft. At the same time, the fixed sleeve drives the cross bar to rotate synchronously, so that the third drive wheel can further tighten the first belt and the second belt to make the second drive wheel rotate more smoothly.

[0014] As a preferred embodiment of the present invention, the transmission component includes a gear ring, a third gear, a fourth gear and a fifth gear, the gear ring is fixed on the outer wall of the fixed sleeve and is coaxially arranged with the fixed sleeve, the third gear is rotatably connected to the main body and meshes with the gear ring, the fourth gear is fixed on the third gear and is coaxially arranged with the third gear, the fifth gear is fixed on the locking shaft and is coaxially arranged with the locking shaft, the fifth gear is meshed with the fourth gear, and a limit assembly for limiting the unidirectional rotation of the third gear is provided on the main body.

[0015] To implement the above technical solution, the locking shaft rotates, the fifth gear drives the fourth gear to rotate, the fourth gear drives the third gear to rotate, the third gear drives the gear ring to rotate, and the gear ring drives the fixed sleeve to rotate, thereby realizing the movement of the third drive wheel to tighten the first belt and the second belt; and in the process of the support shaft moving along its own axial direction, the gear ring can always correspond to the third gear.

[0016] As a preferred solution of the present invention, the third gear includes a fixed ring, a fixed shaft, and connecting teeth. The fixed shaft is fixedly connected to the main body, the fixed ring is rotatably connected to the fixed shaft and is fixedly connected to the fourth gear, a plurality of connecting teeth are fixed on the outer wall of the fixed ring and are located on one side of the fixed ring, and the connecting teeth are meshed with the gear ring.

[0017] To implement the above technical solution, the locking shaft drives the fifth gear to rotate, the fifth gear drives the fourth gear to rotate, the fourth gear drives the fixed ring to rotate, the fixed ring drives the connecting teeth to rotate along the axis of the fixed ring, and the connecting teeth drive the gear ring to rotate, so as to realize the movement of the third driving wheel. As the locking shaft continues to rotate, the first belt and the second belt are further tensioned. When the connecting teeth are separated from the gear ring, the third driving wheel can rotate freely along the axis of the support shaft, thereby achieving the effect of preventing the first belt and the second belt from breaking due to over-tightening. When the first belt and the second belt have been used for a long time and their elasticity is reduced, the locking shaft is rotated to re-tighten the first belt and the second belt to achieve the effect of extending their service life.

[0018] As a preferred solution of the present invention, the limit assembly includes a ratchet, a limit rod and an elastic member, the ratchet is fixed on the outer wall of the fixing ring and is coaxially arranged with the fixing ring, one end of the limit rod is hinged to the main body, and the other end of the limit rod is embedded in the ratchet, and the two ends of the elastic member are respectively connected to the limit rod and the main body, and the elastic member applies a force on the limit rod in the direction close to the ratchet.

[0019] To implement the above technical solution, the third gear drives the toothed ring to rotate in the forward direction, and the outer circle of the ratchet applies a force to the limit rod in the direction away from the ratchet, so that the ratchet can rotate smoothly; through the elastic force of the first belt and the second belt, the toothed ring has a tendency to rotate in the opposite direction, and the ratchet cannot rotate due to the supporting effect of the limit rod, and the limit rod and the ratchet are kept in contact due to the elastic force of the elastic member.

[0020] As a preferred solution of the present invention, the side walls of the first gear slot, the second gear slot and the third gear slot are all provided with guiding inclined surfaces.

[0021] The above technical solution is implemented to prevent the first belt and the second belt from being easily separated.

[0022] As a preferred solution of the present invention, the workbench includes a support base, a support plate and a handle, the support plate is fixed on the support base, the handle is rotatably connected to the support base, the support base is fixed to the main body by a fixing bolt, and the handle rotates and moves the support base along the height direction of the main body through a linkage assembly.

[0023] To implement the above technical solution, the handle is rotated to move the support seat along the height direction of the main body, and the parts are fixed on the support plate to accommodate parts of different heights.

[0024] As a preferred solution of the present invention, the linkage assembly includes a sixth gear, a seventh gear and a rack, the rack is fixed on the main body and arranged along the height direction of the main body, the sixth gear is rotatably connected to the support seat and meshes with the rack, and the seventh gear is fixed on the handle and meshes with the sixth gear.

[0025] To implement the above technical solution, the handle drives the seventh gear to rotate, the seventh gear drives the sixth gear to rotate, the sixth gear moves along the length direction of the rack, and then the support seat is fixed to the main body by a fixing bolt to realize the positioning of the support plate.

[0026] In summary, the present invention has the following beneficial effects: 1. Setting the third drive wheel can increase the speed regulation range of the second drive wheel; 2. By adjusting the rotation of the shaft, the third drive wheel can move along the axial direction of the support shaft, which can further increase the speed regulation range of the second drive wheel. This method can be used to upgrade the traditional bench drill by adding it; 3. After adjusting the height position of the third driving wheel, the length of the first belt and the second belt will be longer or shorter than that of the third driving wheel in the original position. Therefore, it is necessary to rotate the locking shaft in the positive direction to rotate the third driving wheel along the axis of the supporting shaft so that the first belt and the second belt are tensioned at the same time. If the first belt and the second belt have been used for a long time and their elasticity has decreased, they can continue to be used to extend their service life. 4. Continue to rotate the locking shaft in the forward direction, and continue to tighten the first belt and the second belt. When the connecting teeth on the third gear are separated from the gear ring, the third driving wheel can rotate freely along the axis of the support shaft, thereby preventing the first belt and the second belt from breaking due to excessive tension. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the external structure of the present invention; Figure 2 A schematic diagram showing the position of the locking shaft; Figure 3 A schematic diagram showing the positions of the first belt and the second belt; Figure 4 A schematic diagram showing the position of the third driving wheel; Figure 5 A schematic diagram showing the structure of the regulating component; Figure 6 It is a schematic diagram showing the structure of the limit component.

[0028] Figure numerals: 1, main body; 2, workbench; 21, support seat; 22, support plate; 23, handle; 3, linkage assembly; 31, sixth gear; 32, seventh gear; 33, rack; 4, power motor; 41, power shaft; 5, drill assembly; 61, first drive wheel; 62, first gear slot; 63, second drive wheel; 64, second gear slot; 65, third drive wheel; 66, third gear slot; 67, guide ramp; 71, support shaft; 72, crossbar; 73, adjustment The joint shaft; 74, the adjustment component; 75, the slide groove; 76, the slide rod; 77, the screw sleeve; 78, the first gear; 79, the second gear; 81, the fixed sleeve; 82, the locking shaft; 83, the transmission component; 84, the gear ring; 85, the third gear; 851, the fixed ring; 852, the fixed shaft; 853, the connecting tooth; 86, the fourth gear; 87, the fifth gear; 9, the limit assembly; 91, the ratchet; 92, the limit rod; 93, the elastic member; 101, the first belt; 102, the second belt. DETAILED DESCRIPTION

[0029] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp.

[0030] A bench drill structure includes a main body 1, a workbench 2, a power motor 4, and a drill assembly 5. The workbench 2 is fixed on the main body 1 and is located below the drill assembly 5, and the drill assembly 5 is a prior art. The workbench 2 includes a support seat 21, a support plate 22, and a handle 23. The support plate 22 is disc-shaped and fixed on the support seat 21, and the support plate 22 is arranged horizontally. The handle 23 is rotatably connected to the support seat 21, and the support seat 21 is fixed to the main body 1 by a fixing bolt. The handle 23 rotates and moves the support seat 21 along the height direction of the main body 1 through the linkage assembly 3.

[0031] The linkage assembly 3 includes a sixth gear 31, a seventh gear 32 and a rack 33. The rack 33 is fixed to the main body 1 and arranged along the height direction of the main body 1, that is, the rack 33 is arranged vertically. The sixth gear 31 is rotatably connected to the support base 21 and meshed with the rack 33, and the seventh gear 32 is fixed to the handle 23 and meshed with the sixth gear 31.

[0032] The drill assembly 5 and the power motor 4 are both arranged on the main body 1. The power motor 4 is a servo motor, which is placed vertically. A first driving wheel 61 is fixedly connected to the power shaft 41 of the power motor 4, and the first driving wheel 61 is coaxially arranged with the power shaft 41.

[0033] A plurality of coaxially arranged first gear slots 62 are provided on the first driving wheel 61, and the inner diameters of the plurality of first gear slots 62 increase sequentially from top to bottom. A second driving wheel 63 is connected to the drill assembly 5, and a plurality of coaxially arranged second gear slots 64 are provided on the second driving wheel 63, and the inner diameters of the plurality of second gear slots 64 increase sequentially from top to bottom.

[0034] A third driving wheel 65 is rotatably connected to the main body 1. The axes of the first driving wheel 61, the second driving wheel 63 and the third driving wheel 65 are parallel. The third driving wheel 65 is located between the first driving wheel 61 and the second driving wheel 63. The third driving wheel 65 is provided with a plurality of coaxially arranged third gear slots 66. The inner diameters of the plurality of third gear slots 66 decrease sequentially from top to bottom.

[0035] The first gear slot 62 and the third gear slot 66 are connected via a first belt 101 , and the second gear slot 64 and the third gear slot 66 are connected via a second belt 102 .

[0036] The side walls of the first gear slot 62 , the second gear slot 64 , and the third gear slot 66 are all provided with guiding inclined surfaces 67 .

[0037] A vertically arranged support shaft 71 is connected to the main body 1, and the axis of the support shaft 71 is parallel to the axis of the third driving wheel 65. A horizontally arranged cross bar 72 is connected to the support shaft 71. The third driving wheel 65 is rotatably connected to one end of the cross bar 72 away from the support shaft 71. A horizontally arranged adjustment shaft 73 is rotatably connected to the side wall of the main body 1, and the adjustment shaft 73 rotates and moves the support shaft 71 along the axial direction of the support shaft 71 through the adjustment assembly 74.

[0038] The adjustment assembly 74 includes a slide groove 75, a slide rod 76, a screw sleeve 77, a first gear 78 and a second gear 79. The slide groove 75 is provided on the outer wall of the support shaft 71, and the length direction of the slide groove 75 is parallel to the axial direction of the support shaft 71. The slide rod 76 is arranged horizontally, and one end of the slide rod 76 is fixed to the main body 1, and the other end of the slide rod 76 is slidably connected to the slide groove 75 to limit the rotation of the support shaft 71. The support shaft 71 penetrates into the screw sleeve 77 and is threadedly connected with the screw sleeve 77, and the screw sleeve 77 is coaxially arranged with the support shaft 71.

[0039] The screw sleeve 77 is rotatably connected to the main body 1, and the screw sleeve 77 can only rotate horizontally but cannot move. The first gear 78 is fixed on the outer wall of the screw sleeve 77 and is coaxially arranged with the screw sleeve 77, and the second gear 79 is fixed on the adjustment shaft 73 and is coaxially arranged with the adjustment shaft 73, and the first gear 78 is meshed with the second gear 79. The first gear 78 and the second gear 79 are both bevel gears.

[0040] The cross bar 72 is rotatably connected to the support shaft 71, and a fixing sleeve 81 is fixedly connected to the cross bar 72. The fixing sleeve 81 is sleeved on the outside of the support shaft 71, and the length direction of the fixing sleeve 81 extends toward the lower end of the support shaft 71. A locking shaft 82 is rotatably connected to the outer wall of the main body 1, and the locking shaft 82 is horizontally arranged. The locking shaft 82 rotates and causes the fixing sleeve 81 to rotate along the axis of the support shaft 71 through the transmission component 83.

[0041] The transmission component 83 includes a gear ring 84, a third gear 85, a fourth gear 86 and a fifth gear 87. The gear ring 84 is fixed to the outer wall of the fixing sleeve 81 and is coaxially arranged with the fixing sleeve 81. The height of the gear ring 84 is close to the height of the fixing sleeve 81. The third gear 85 is rotatably connected to the main body 1 and meshed with the gear ring 84. The fourth gear 86 is fixed to the lower end of the third gear 85 and is coaxially arranged with the third gear 85. The fifth gear 87 is fixed to the locking shaft 82 and is coaxially arranged with the locking shaft 82. The fifth gear 87 meshes with the fourth gear 86.

[0042] The fourth gear 86 and the fifth gear 87 are bevel gears.

[0043] The third gear 85 includes a fixing ring 851, a fixing shaft 852, and a connecting tooth 853. The fixing shaft 852 is vertically arranged and fixedly connected to the main body 1. The fixing ring 851 is rotatably connected to the fixing shaft 852, and the fixing ring 851 and the fixing shaft 852 are coaxially arranged. The lower end of the fixing ring 851 is fixedly connected to the fourth gear 86.

[0044] A plurality of connecting teeth 853 are fixed on the outer wall of the fixing ring 851 and are located on one side of the fixing ring 851. The connecting teeth 853 are used to mesh with the gear ring 84.

[0045] A limiting assembly 9 for limiting the one-way rotation of the third gear 85 is provided on the main body 1 .

[0046] The limiting assembly 9 includes a ratchet 91, a limiting rod 92 and an elastic member 93. The ratchet 91 is fixed to the outer wall of the fixing ring 851 and is coaxially arranged with the fixing ring 851. One end of the limiting rod 92 is hinged to the main body 1, and the other end of the limiting rod 92 is embedded in the ratchet 91. The two ends of the elastic member 93 are respectively connected to the limiting rod 92 and the main body 1, and the elastic member 93 applies a force to the limiting rod 92 in the direction of approaching the ratchet 91. The elastic member 93 is a spring.

[0047] To sum up, when in use, the adjusting shaft 73 is rotated, the second gear 79 drives the first gear 78 to rotate, and the first gear 78 drives the screw sleeve 77 to rotate. Through the conduction effect of the thread, the support shaft 71 moves along its own axial direction, so that the third driving wheel 65 can move up and down with the support shaft 71, and the support shaft 71 is limited by the self-locking property of the thread.

[0048] When the support shaft 71 moves up and down, the gear ring 84 moves up and down synchronously with the support shaft 71 , and the connecting teeth 853 on the third gear 85 always keep meshing with the gear ring 84 .

[0049] After adjusting the height position of the third driving wheel 65, the first belt 101 and the second belt 102 will be too long or too short, and the first belt 101 and the second belt 102 need to be tightened. First, manually push the third driving wheel 65 toward the outside of the main body 1 to keep the first belt 101 and the second belt 102 in an unopened state, then rotate the locking shaft 82, the fifth gear 87 drives the fourth gear 86 to rotate, the fourth gear 86 drives the fixing ring 851 to rotate, the fixing ring 851 drives the connecting teeth 853 to rotate along the axis of the fixing ring 851, the connecting teeth 853 drives the gear ring 84 to rotate, and the gear ring 84 rotates the cross bar 72 through the fixing sleeve 81, thereby realizing the movement of the third driving wheel 65. By adjusting the gear ratio of all gears, the effect of saving effort in rotating the locking shaft 82 can be achieved.

[0050] As the locking shaft 82 continues to rotate, the first belt 101 and the second belt 102 are further tightened. When the connecting tooth 853 is separated from the gear ring 84, the third driving wheel 65 can rotate freely along the axis of the support shaft 71, thereby preventing the first belt 101 and the second belt 102 from breaking due to over-tightening.

[0051] After the locking shaft 82 stops rotating, the limiting rod 92 is embedded in the ratchet 91 by the elastic force of the elastic member 93 , and the third driving wheel 65 is kept in a limited state by the elastic force of the ratchet 91 and the first belt 101 and the second belt 102 .

[0052] Of course, the above are only typical examples of the present invention. In addition, the present invention may also have many other specific implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A bench drill structure, comprising a main body (1), a workbench (2), a power motor (4), and a drill assembly (5), wherein the workbench (2) is fixed on the main body (1) and is located below the drill assembly (5), the drill assembly (5) and the power motor (4) are both arranged on the main body (1), a first driving wheel (61) is fixedly connected to the power shaft (41) of the power motor (4), the first driving wheel (61) is provided with a plurality of coaxially arranged first gear slots (62), the inner diameters of the plurality of first gear slots (62) increasing from top to bottom, the drill assembly (5) is connected with a second driving wheel (63), the second driving wheel (63) is provided with a plurality of coaxially arranged second gear slots (64), the inner diameters of the plurality of second gear slots (64) increasing from top to bottom, and the characteristics are: The main body (1) is rotatably connected with a third driving wheel (65); the axes of the first driving wheel (61), the second driving wheel (63) and the third driving wheel (65) are parallel; the third driving wheel (65) is located between the first driving wheel (61) and the second driving wheel (63); the third driving wheel (65) is provided with a plurality of coaxially arranged third gear slots (66); the inner diameters of the plurality of third gear slots (66) decrease from top to bottom; the first gear slot (62) and the third gear slot (66) are connected via a first belt (101); and the second gear slot (64) and the third gear slot (66) are connected via a second belt (102).

2. The bench drill structure according to claim 1, characterized in that: The main body (1) is connected to a support shaft (71), the axis of the support shaft (71) is parallel to the axis of the third driving wheel (65), the support shaft (71) is connected to a cross bar (72), the third driving wheel (65) is rotatably connected to one end of the cross bar (72) away from the support shaft (71), and the side wall of the main body (1) is rotatably connected to an adjustment shaft (73), the adjustment shaft (73) rotates and enables the support shaft (71) to move along the axial direction of the support shaft (71) through an adjustment component (74).

3. The bench drill structure according to claim 2, characterized in that: The adjusting assembly (74) comprises a slide groove (75), a slide rod (76), a screw sleeve (77), a first gear (78) and a second gear (79). The slide groove (75) is provided on the outer wall of the support shaft (71). The length direction of the slide groove (75) is parallel to the axial direction of the support shaft (71). One end of the slide rod (76) is fixed to the main body (1). The other end of the slide rod (76) is slidably connected to the slide groove (75). The support shaft (71) is inserted into the screw sleeve (77) and is threadedly connected to the screw sleeve (77). The screw sleeve (77) is rotatably connected to the main body (1). The first gear (78) is fixed to the outer wall of the screw sleeve (77) and is coaxially arranged with the screw sleeve (77). The second gear (79) is fixed to the adjusting shaft (73) and is coaxially arranged with the adjusting shaft (73). The first gear (78) is meshed with the second gear (79).

4. A bench drill structure according to claim 2 or 3, characterized in that: The cross bar (72) is rotatably connected to the support shaft (71), a fixing sleeve (81) is fixedly connected to the cross bar (72), and the fixing sleeve (81) is sleeved on the outside of the support shaft (71). A locking shaft (82) is rotatably connected to the outer wall of the main body (1), and the locking shaft (82) rotates and causes the fixing sleeve (81) to rotate along the axis of the support shaft (71) through a transmission component (83).

5. The bench drill structure according to claim 4, characterized in that: The transmission component (83) comprises a toothed ring (84), a third gear (85), a fourth gear (86) and a fifth gear (87); the toothed ring (84) is fixed on the outer wall of the fixing sleeve (81) and is coaxially arranged with the fixing sleeve (81); the third gear (85) is rotatably connected to the main body (1) and meshes with the toothed ring (84); the fourth gear (86) is fixed on the third gear (85) and is coaxially arranged with the third gear (85); the fifth gear (87) is fixed on the locking shaft (82) and is coaxially arranged with the locking shaft (82); the fifth gear (87) meshes with the fourth gear (86); and a limiter component (9) for limiting the unidirectional rotation of the third gear (85) is provided on the main body (1).

6. The bench drill structure according to claim 5, characterized in that: The third gear (85) comprises a fixed ring (851), a fixed shaft (852), and connecting teeth (853); the fixed shaft (852) is fixedly connected to the main body (1); the fixed ring (851) is rotatably connected to the fixed shaft (852) and is fixedly connected to the fourth gear (86); a plurality of connecting teeth (853) are fixed on the outer wall of the fixed ring (851) and are located on one side of the fixed ring (851); and the connecting teeth (853) are meshed with the gear ring (84).

7. The bench drill structure according to claim 6, characterized in that: The limiting assembly (9) comprises a ratchet (91), a limiting rod (92) and an elastic member (93); the ratchet (91) is fixed on the outer wall of the fixing ring (851) and is coaxially arranged with the fixing ring (851); one end of the limiting rod (92) is hinged on the main body (1); the other end of the limiting rod (92) is embedded in the ratchet (91); the two ends of the elastic member (93) are respectively connected to the limiting rod (92) and the main body (1); the elastic member (93) applies a force to the limiting rod (92) in a direction close to the ratchet (91).

8. The bench drill structure according to claim 1, characterized in that: The side walls of the first gear slot (62), the second gear slot (64) and the third gear slot (66) are all provided with guiding inclined surfaces (67).

9. The bench drill structure according to claim 1, characterized in that: The workbench (2) comprises a support base (21), a support plate (22) and a handle (23); the support plate (22) is fixed on the support base (21); the handle (23) is rotatably connected to the support base (21); the support base (21) is fixed to the main body (1) via a fixing bolt; the handle (23) rotates and moves the support base (21) along the height direction of the main body (1) via a linkage assembly (3).

10. The bench drill structure according to claim 9, characterized in that: The linkage assembly (3) comprises a sixth gear (31), a seventh gear (32) and a rack (33); the rack (33) is fixed on the main body (1) and arranged along the height direction of the main body (1); the sixth gear (31) is rotatably connected to the support seat (21) and meshes with the rack (33); the seventh gear (32) is fixed on the handle (23) and meshes with the sixth gear (31).

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