A bracket for a level measuring instrument

Abstract

The present invention is applicable to the technical field of surveying instrument brackets, and provides a bracket for a level surveying instrument, comprising a base, wherein three supporting feet arranged in a circular array are provided at the bottom of the base, and adjusting columns are provided on the lower sides of the three supporting feet, and the upper ends of the adjusting columns slide and penetrate into the supporting feet, and a built-in cavity is provided in the supporting feet, and a screw is rotatably connected to the upper surface of the adjusting column, and the upper end of the screw thread penetrates into the built-in cavity, and a connecting mechanism driving the screw to rotate is provided in the built-in cavity, and an extension driving mechanism driving the connecting mechanism to rotate in the reverse direction is provided in the built-in cavity, the interior of the base is hollow, and a horizontal adjustment mechanism driving the extension driving mechanism to operate is provided in the base, and a contraction driving mechanism driving the screw to reset is provided in the built-in cavity, and the device can ensure the levelness of the base surface, avoid the problem of tilting of the base as much as possible, and improve the effect of the level surveying instrument during surveying.

Description

Technical Field

[0001] The present invention relates to the technical field of surveying instrument brackets, and more particularly to a bracket for a level surveying instrument. Background Art

[0002] The surveying and mapping instrument literally means measurement and mapping. It is based on computer technology, optoelectronic technology, network communication technology, space science, and information science, with global navigation satellite positioning system, remote sensing, and geographic information system as its technical core. It selects existing feature points and boundaries on the ground and obtains graphics and location information reflecting the current situation on the ground through measurement methods.

[0003] When using a surveying instrument for measurement, the surveying instrument is generally supported by a bracket. When measurement is required, the legs of the bracket are opened to a certain angle so that the tripod can support the surveying instrument, and then the relevant measurement work is carried out.

[0004] However, most of the existing level surveying instruments have the following problems when used: measurements are generally carried out at locations where construction is required, and these construction locations are generally bumpy ground. Using a tripod to install the surveying instrument will cause the surveying instrument to tilt, making it inconvenient to adjust the level of the surveying instrument. During the detection process, the surveying instrument body will tilt, which can easily affect the measurement results and cause errors in the measurement results. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a bracket for a level surveying instrument that can ensure the levelness of the base surface, avoid the problem of the base tilting as much as possible, and improve the effect of the level surveying instrument during surveying.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A bracket for a level surveying instrument includes a base, the bottom of the base is provided with three supporting feet arranged in a circular array, a limiting disk is provided between the three supporting feet, and three pulling plates are hinged between the three supporting feet and the limiting disk. The lower sides of the three supporting feet are provided with adjusting columns, the upper ends of the adjusting columns slide through the supporting feet, and a built-in cavity is provided in the supporting feet. The upper surface of the adjusting column is rotatably connected to a screw, and the upper end thread of the screw penetrates into the built-in cavity. A connecting mechanism that drives the screw to rotate is provided in the built-in cavity, and an extension drive mechanism that drives the connecting mechanism to rotate in the reverse direction is provided in the built-in cavity. The interior of the base is hollow, and a horizontal adjustment mechanism that drives the extension drive mechanism is provided in the base, and a contraction drive mechanism that drives the screw to reset is provided in the built-in cavity.

[0008] The present invention is further configured as follows: the connecting mechanism includes a rotating shaft, the upper end of the rotating shaft is rotatably connected to the top inner wall of the built-in cavity, a movable groove is provided on the upper surface of the screw, the lower end of the rotating shaft extends into the movable groove and slides in the movable groove, a plurality of limiting grooves are provided on the inner wall of the movable groove, the limiting grooves extend out of the upper surface of the screw, a limiting slider is fixedly connected to the outer surface of the rotating shaft near the limiting groove, the limiting slider extends into the limiting groove and slides in the limiting groove.

[0009] The present invention is further configured as follows: a first bevel gear is fixedly sleeved on the outer surface of the rotating shaft, the extended driving mechanism includes a second bevel gear and a first gear, the second bevel gear is arranged on the upper side of the first bevel gear and is meshed with the first bevel gear, the first gear is provided with a shaft structure that drives the first bevel gear to rotate in the forward direction, and the outer side of the first gear is meshed with the first rack.

[0010] The present invention is further configured as follows: a connecting groove extending from the outer surface of the support leg is opened on the inner wall of the built-in cavity near the first rack, a connecting plate is fixedly connected to the surface of one side of the first rack near the connecting groove, and the other side of the connecting plate extends from the outer surface of the support leg through the connecting groove, the outer surface of the support leg is fixedly connected to a hinge seat, a rotating plate is rotatably connected to the hinge seat, and a push plate is rotatably connected between the lower side of the rotating plate and the side of the connecting plate located outside the support leg.

[0011] The present invention is further configured as follows: a limiting slide rod is fixedly connected between the upper and lower inner walls of the connecting slide groove, the connecting plate is slidably sleeved on the outer surface of the limiting slide rod, a spring is fixedly connected between the lower surface of the connecting plate and the bottom wall of the connecting slide groove, and the spring is movably sleeved on the outer surface of the limiting slide rod.

[0012] The present invention is further configured as follows: the horizontal adjustment mechanism includes a horizontal iron ball, which is placed at the center of the inner cavity of the base. Three arc-shaped extrusion plates arranged in a circular array are provided in the base. The three arc-shaped extrusion plates can be combined into a circular ring, and the horizontal iron ball is located at the center of the circular ring. A push rod is fixedly connected to the outer surface of the arc-shaped extrusion plate facing away from the horizontal iron ball. The other end of the push rod slides through the outer surface of the base and contacts the upper side of the rotating plate.

[0013] The present invention is further configured as follows: a central groove is opened at the center of the bottom wall of the base, the bottom of the horizontal iron ball is arranged in the central groove, a magnet for magnetically attracting the horizontal iron ball is embedded on the inner wall of the central groove, and a notch is opened at the adjacent corners of the two arc-shaped extrusion plates.

[0014] The present invention is further configured as follows: the hinge seat is arranged on a side of the rotating plate close to the connecting plate.

[0015] The present invention is further configured as follows: the shaft structure includes a first shaft body and a second shaft body, one end of the first shaft body and the second shaft body adjacent to each other are rotatably connected, the first gear is fixedly sleeved on the outer surface of the first shaft body, and the second bevel gear is fixedly sleeved on the outer surface of the second shaft body for rotation. The other end of the first shaft body is rotatably connected to the inner wall of the built-in cavity, and a driving cavity is opened in the second shaft body, and a driving shaft is fixedly connected to the side surface of the first shaft body close to the second shaft body, and the other end of the driving shaft rotates and penetrates into the driving cavity. The driving shaft is located on the outer surface of the driving cavity and is fixedly connected to a driving rod in a circumferential array. The rotating seat is rotatably connected to a contact plate, and a torsion spring is provided between the contact plate and the rotating seat, so that the contact plate is vertical under the action of the torsion spring, and the other side of the driving rod contacts the contact plate, and a plurality of baffles are fixedly connected to the annular inner wall of the driving cavity, and the baffle is provided on the side of the contact plate facing the clockwise rotation direction of the second shaft body and contacts the contact plate.

[0016] The present invention is further configured as follows: the retraction drive mechanism includes a guide rail, which is fixedly mounted on the bottom wall of the built-in cavity; a second rack is provided on the guide rail; a guide rail joint is inlaid on the lower side of the second rack; the second rack is slidably connected to the guide rail through the guide rail joint; a second gear is fixedly sleeved on the outer surface of the screw located in the built-in cavity; the thickness of the second rack is greater than the thickness of the second gear; an extrusion strip is fixedly connected to the side of the second rack; the other side of the extrusion strip slides through the outer surface of the support leg and contacts the pulling plate.

[0017] The advantages of the present invention are:

[0018] First, the present invention can adjust the extension length of the adjustment column, so when the bracket is placed on a bumpy ground, the level of the base surface can be guaranteed, the problem of the base tilting can be avoided as much as possible, and the effect of the level surveyor during surveying is improved.

[0019] Secondly, the present invention is provided with an extension drive mechanism and a horizontal adjustment mechanism, so the extension drive mechanism can automatically adjust the adjustment column according to the tilt direction of the base. When the support leg is placed on a bumpy ground, the base can be automatically leveled without manual control, which further improves the convenience of using the bracket and reduces the workload of the staff.

[0020] Third, the present invention sets a limiting slide groove and a limiting slider, so that when the rotating shaft rotates, the limiting slider rotates synchronously with the rotating shaft, and the screw rotates synchronously driven by the limiting slider. At the same time, since the screw will move upward or downward during rotation, the limiting slider slides in the limiting slide groove. In this way, without affecting the driving screw, it will not limit the up and down displacement of the screw, further ensuring the driving effect of the connecting mechanism.

[0021] Fourthly, the present invention is provided with a center groove and a magnet. When the base is adjusted to a level, the horizontal iron ball will roll back into the center groove under the action of inertia. At the same time, the magnet will form a magnetic attraction effect on the horizontal iron ball, which can provide a certain buffering effect for the horizontal iron ball and avoid the situation where the horizontal iron ball rolls too far and generates thrust on the arc extrusion plate on the other side.

[0022] Fifth, the present invention is provided with notches. When the horizontal iron ball displaces to the side adjacent to the two arc-shaped extrusion plates, the horizontal iron ball contacts the two notches, thereby ensuring the pushing effect of the horizontal iron ball on the two arc-shaped extrusion plates. At the same time, when the two arc-shaped extrusion plates displace to one side of the central groove, the two notches will form a restrictive effect on the horizontal iron ball, thereby avoiding deviation of the horizontal iron ball when rolling.

[0023] Sixth, the present invention arranges the hinge seat on the side of the rotating plate close to the connecting plate, so that the force arm on the side where the rotating plate contacts the push rod is longer. According to the principle of leverage, the thrust of the push rod when pushing the rotating plate to rotate is relatively small, thus avoiding the problem that the push rod cannot push the rotating plate to rotate as much as possible, and further ensuring the stability of the extension drive mechanism during operation.

[0024] Seventh, the present invention is provided with a shaft structure, which will not drive the second bevel gear and the third bevel gear to rotate counterclockwise, thereby avoiding the adjustment column from shrinking into the support leg when it does not need to shrink and extending the support leg when it does not need to extend, thereby ensuring the stability of the bracket after adjustment.

[0025] Eighth, the present invention is provided with a contraction drive mechanism, which can automatically control the screw to rotate to the initial position after the bracket is folded and contracted, so as to facilitate the use of the bracket in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a bracket for a level surveying instrument according to the present invention;

[0027] Figure 2 is a first cross-sectional schematic diagram of a support leg of the present invention;

[0028] Figure 3 for Figure 2 Enlarged view of point C in the middle;

[0029] Figure 4 for Figure 2 Enlarged view of point A in the middle;

[0030] Figure 5 for Figure 1 Enlarged view of point B in the middle;

[0031] Figure 6 This is a schematic diagram of the limiting sliding rod connection structure of the present invention;

[0032] Figure 7 A top plan view of the internal structure of the base of the present invention;

[0033] Figure 8 It is a schematic cross-sectional view of the base of the present invention;

[0034] Figure 9 It is a side plan view of the internal structure of the second shaft of the present invention;

[0035] Figure 10 This is a front plan view of the internal structure of the second shaft of the present invention;

[0036] In the figure: 1, base; 101, horizontal iron ball; 102, arc-shaped extrusion plate; 103, push rod; 104, magnet; 105, notch; 106, center groove;

[0037] 2. Support legs; 3. Adjustment column; 4. Screw; 5. Built-in cavity;

[0038] 6. Connecting mechanism; 601. Rotating shaft; 602. Movable slot; 603. Limiting slider; 604. Limiting slide; 605. First bevel gear;

[0039] 7. Extension drive mechanism; 701. Second bevel gear; 702. First gear; 703. First rack; 704. Connecting chute; 705. Connecting plate; 706. Articulated seat; 707. Rotating plate; 708. Push plate; 709. Limiting slide bar; 710. Spring;

[0040] 8. Shaft structure; 801. First shaft; 802. Second shaft; 803. Drive cavity; 804. Drive shaft; 805. Drive rod; 806. Rotating seat; 807. Contact plate; 808. Baffle;

[0041] 9. Contraction drive mechanism; 901. Guide rail; 902. Second rack; 903. Guide rail joint; 904. Second gear; 905. Extrusion bar;

[0042] 10. Restriction plate; 11. Pull plate. DETAILED DESCRIPTION

[0043] See also Figure 1-10 , the present invention provides the following technical solutions:

[0044] Specifically, it refers to a bracket for a level surveying instrument, including a base 1. The bottom of the base 1 is provided with three supporting legs 2 arranged in a circular array, a limiting disk 10 is provided between the three supporting legs 2, and three pulling plates 11 are hinged between the three supporting legs 2 and the limiting disk 10. The lower side of the three supporting legs 2 is provided with an adjusting column 3, the upper end of the adjusting column 3 slides through the supporting leg 2, and a built-in cavity 5 is opened in the supporting leg 2. The upper surface of the adjusting column 3 is rotatably connected to the screw rod 4, and the upper end of the screw rod 4 is threaded into the built-in cavity 5. A connecting mechanism 6 that drives the screw rod 4 to rotate is provided in the built-in cavity 5, and an extension driving mechanism 7 that drives the connecting mechanism 6 to rotate in the reverse direction is provided in the built-in cavity 5. The interior of the base 1 is hollow, and a horizontal adjustment mechanism that drives the extension driving mechanism 7 to operate is provided in the base 1, and a contraction driving mechanism 9 that drives the screw rod 4 to reset is provided in the built-in cavity 5.

[0045] When the bracket is placed on a bumpy ground, if one of the legs 2 of the bracket is placed on a bump and tilted up, the side of the base 1 close to the bump will be tilted upward, and the extension drive mechanism 7 in the other two legs 2 will be driven to operate by the horizontal adjustment mechanism, so that the extension drive mechanism 7 controls the screw 4 in the other two legs 2 to rotate counterclockwise. The screw 4 pushes the adjustment column 3 to extend a certain distance from the leg 2 under the transmission of the thread, so that the base 1 is level. This method further ensures the stability of the bracket when it is placed on a bumpy ground, while also avoiding the problem of tilting of the base 1 as much as possible, thereby improving the effect of the levelness surveyor when in use.

[0046] Specifically, the connecting mechanism 6 includes a rotating shaft 601, the upper end of the rotating shaft 601 is rotatably connected to the top inner wall of the built-in cavity 5, a movable groove 602 is provided on the upper surface of the screw 4, the lower end of the rotating shaft 601 extends into the movable groove 602 and slides in the movable groove 602, a plurality of limiting grooves 604 are provided on the inner wall of the movable groove 602, the limiting groove 604 extends out of the upper surface of the screw 4, and a limiting slider 603 is fixedly connected to the outer surface of the rotating shaft 601 near the limiting groove 604, the limiting slider 603 extends into the limiting groove 604 and slides in the limiting groove 604.

[0047] By setting the limiting slide groove 604 and the limiting slider 603, when the rotating shaft 601 rotates, the limiting slider 603 rotates synchronously with the rotating shaft 601, and the screw 4 rotates synchronously under the drive of the limiting slider 603. At the same time, since the screw 4 will move upward or downward during rotation, the limiting slider 603 slides in the limiting slide groove 604. In this way, without affecting the driving screw 4, the up and down displacement of the screw 4 will not be restricted, further ensuring the driving effect of the connecting mechanism 6.

[0048] Specifically, a first bevel gear 605 is fixedly sleeved on the outer surface of the rotating shaft 601, and the extension drive mechanism 7 includes a second bevel gear 701 and a first gear 702. The second bevel gear 701 is arranged on the upper side of the first bevel gear 605 and is meshed with the first bevel gear 605. The first gear 702 is provided with an axis structure 8 that drives the second bevel gear 701 to rotate in the forward direction, and the outer side of the first gear 702 is meshed with the first rack 703.

[0049] When in use, by controlling the downward displacement of the first rack 703, the first rack 703 synchronously engages and drives the first gear 702 to rotate clockwise, and the first gear 702 drives the second bevel gear 701 to rotate clockwise under the transmission of the shaft structure 8, and the first bevel gear 605 rotates counterclockwise under the transmission of the second bevel gear 701, so that the screw 4 pushes the adjustment column 3 to extend the support leg 2.

[0050] Specifically, a connecting groove 704 extending from the outer surface of the support leg 2 is opened on the inner wall of the built-in cavity 5 near the first rack 703, and a connecting plate 705 is fixedly connected to the surface of one side of the first rack 703 near the connecting groove 704, and the other side of the connecting plate 705 extends from the outer surface of the support leg 2 through the connecting groove 704, and the outer surface of the support leg 2 is fixedly connected to a hinge seat 706, and a rotating plate 707 is rotatably connected to the hinge seat 706, and a push plate 708 is rotatably connected between the lower side of the rotating plate 707 and the side of the connecting plate 705 located outside the support leg 2.

[0051] When the upper side of the rotating plate 707 is pushed to move outward, the rotating plate 707 rotates counterclockwise with the hinge seat 706 as the rotation point, so that the lower side of the rotating plate 707 will form a thrust on the push plate 708, so that the push plate 708 forms a downward thrust on the connecting plate 705, and the connecting plate 705 moves downward in the connecting groove 704.

[0052] Specifically, a limiting slide bar 709 is fixedly connected between the upper and lower inner walls of the connecting chute 704, and the connecting plate 705 is slidably sleeved on the outer surface of the limiting slide bar 709. A spring 710 is fixedly connected between the lower surface of the connecting plate 705 and the bottom wall of the connecting chute 704, and the spring 710 is movably sleeved on the outer surface of the limiting slide bar 709.

[0053] When the spring 710 is not squeezed, the spring 710 will push the connecting plate 705 so that the connecting plate 705 is located at the top of the connecting slot 704 , and the first rack 703 is not engaged with the first gear 702 .

[0054] Specifically, the horizontal adjustment mechanism includes a horizontal iron ball 101, which is placed at the center of the inner cavity of the base 1. Three arc-shaped extrusion plates 102 are arranged in a circular array in the base 1. The three arc-shaped extrusion plates 102 can be combined into a circular ring, and the horizontal iron ball 101 is located at the center of the circular ring. A push rod 103 is fixedly connected to the outer surface of the arc-shaped extrusion plate 102 facing away from the horizontal iron ball 101. The other end of the push rod 103 slides through the outer surface of the base 1 and contacts the upper side of the rotating plate 707.

[0055] During use, when one side of the base 1 is tilted, the horizontal iron ball 101 will be displaced toward the two arc-shaped extrusion plates 102 in the tilting direction under the action of inertia. Since the horizontal iron ball 101 is heavier, the horizontal iron ball 101 will form a thrust on the two arc-shaped extrusion plates 102 when it is displaced, causing the two arc-shaped extrusion plates 102 to be displaced toward the outside of the base 1. At the same time, the two push rods 103 are displaced outward and form a thrust on the upper side of the rotating plate 707, thereby controlling the two adjustment columns 3 away from the tilting direction to extend the support legs 2, so that the base 1 remains horizontal. The above structure can automatically adjust the adjustment columns 3 according to the tilting direction of the base 1. When the support legs 2 are placed on a bumpy ground, the base 1 can be automatically leveled without manual control, which further improves the convenience of using the bracket and reduces the workload of the staff.

[0056] In the present invention, the diameter of the horizontal iron ball 101 is larger than the distance between the maximum displacement distances of the two arc-shaped extrusion plates 102, so that the problem of the horizontal iron ball 101 sliding between the two arc-shaped extrusion plates 102 causing the two arc-shaped extrusion plates 102 to get stuck will not occur.

[0057] Specifically, a central groove 106 is provided at the center of the bottom wall of the base 1, and the bottom of the horizontal iron ball 101 is provided in the central groove 106. The inner wall of the central groove 106 is inlaid with a magnet 104 that magnetically attracts the horizontal iron ball 101. At the same time, the weight of the horizontal iron ball 101 is greater than the magnetic attraction of the magnet 104. Therefore, when the base 1 is tilted, the horizontal iron ball 101 will still roll under the action of inertia. When the base 1 is adjusted to a horizontal level, the horizontal iron ball 101 will roll back into the central groove 106 under the action of inertia. At the same time, the magnet 104 will form a magnetic attraction effect on the horizontal iron ball 101, which can form a certain buffering purpose for the horizontal iron ball 101, and try to avoid the situation where the horizontal iron ball 101 rolls too much and generates thrust on the arc extrusion plate 102 on the other side.

[0058] Specifically, a notch 105 is provided at one adjacent corner of the two arc-shaped extrusion plates 102. Therefore, when the horizontal iron ball 101 displaces toward the side adjacent to the two arc-shaped extrusion plates 102, the horizontal iron ball 101 contacts the two notches 105, thereby ensuring the pushing effect of the horizontal iron ball 101 on the two arc-shaped extrusion plates 102. At the same time, when the two arc-shaped extrusion plates 102 displace toward one side of the central groove 106, the two notches 105 will form a restrictive effect on the horizontal iron ball 101, thereby minimizing deviation of the horizontal iron ball 101 when rolling.

[0059] Specifically, the hinge seat 706 is arranged on the side of the rotating plate 707 close to the connecting plate 705, so that the force arm on the side where the rotating plate 707 contacts the push rod 103 is longer. According to the principle of leverage, the thrust of the push rod 103 when pushing the rotating plate 707 to rotate is small, which avoids the problem that the push rod 103 cannot push the rotating plate 707 to rotate, and further ensures the stability of the extension drive mechanism 7 during operation.

[0060] Specifically, the shaft structure 8 includes a first shaft 801 and a second shaft 802, and the first shaft 801 and the second shaft 802 are rotatably connected at one end adjacent to each other. The first gear 702 is fixedly sleeved on the outer surface of the first shaft 801, and the second bevel gear 701 is fixedly sleeved on the outer surface of the second shaft 802. The other end of the first shaft 801 is rotatably connected to the inner wall of the built-in cavity 5, and a driving cavity 803 is provided in the second shaft 802. A driving shaft 804 is fixedly connected to the surface of one side of the first shaft 801 close to the second shaft 802, and the other end of the driving shaft 804 is rotatably inserted into the driving cavity 803. The driving shaft 804 is positioned A driving rod 805 is fixedly connected to the outer surface of the driving cavity 803. A plurality of rotating seats 806 in a circumferential array are fixedly connected to the annular inner wall of the driving cavity 803. A contact plate 807 is rotatably connected to the rotating seat 806. A torsion spring is provided between the contact plate 807 and the rotating seat 806. In this way, the contact plate 807 is vertically positioned under the action of the torsion spring, and the other side of the driving rod 805 contacts the contact plate 807. A plurality of baffles 808 are fixedly connected to the annular inner wall of the driving cavity 803. The baffles 808 are provided on the side of the contact plate 807 facing the clockwise rotation direction of the second shaft 802 and contact the contact plate 807.

[0061] When the first gear 702 drives the first shaft 801 to rotate clockwise, the driving shaft 804 synchronously drives the driving rod 805 to rotate clockwise, so that the driving rod 805 will form a thrust on the contact plate 807. Since the contact plate 807 is restricted by the baffle 808 and cannot rotate, it can drive the second shaft 802 to rotate clockwise synchronously. When the base 1 is adjusted to the level, the horizontal iron ball 101 cannot form a thrust on the arc-shaped extrusion plate 102, so that the push rod 103 no longer squeezes the upper side of the rotating plate 707. At this time, the spring 710 will cause the connecting plate 705 to form an upward displacement. When the first rack 703 moves upward, it will drive the second rack 702 to rotate clockwise. When the gear 702 rotates counterclockwise, the driving rod 805 rotates counterclockwise in the driving chamber 803. Since the baffle 808 is arranged on the side of the contact plate 807 facing the clockwise rotation direction of the second shaft 802, the baffle 808 cannot block the contact plate 807, so that the contact plate 807 rotates on the rotating seat 806 and cannot drive the second shaft 802 to rotate. When the connecting plate 705 moves to the initial position, the first rack 703 no longer contacts the first gear 702. The above structure avoids the situation where the adjustment column 3 is driven to move into the support leg 2 when the first rack 703 is reset, thereby ensuring the stability of the bracket after adjustment.

[0062] Specifically, the contraction drive mechanism 9 includes a guide rail 901, which is fixedly mounted on the bottom wall of the built-in cavity 5. A second rack 902 is provided on the guide rail 901. A guide rail joint 903 is inlaid on the lower side of the second rack 902. The second rack 902 is slidingly connected to the guide rail 901 through the guide rail joint 903. A second gear 904 is fixedly sleeved on the outer surface of the screw 4 located in the built-in cavity 5. The thickness of the second rack 902 is greater than the thickness of the second gear 904. An extrusion bar 905 is fixedly connected to the side of the second rack 902. The other side of the extrusion bar 905 slides through the outer surface of the support leg 2 and contacts the pulling plate 11.

[0063] When the screw 4 rotates counterclockwise, the second gear 904 on the screw 4 rotates synchronously. Since the thickness of the second rack 902 is greater than the thickness of the second gear 904, the second gear 904 can always engage with the second rack 902 when the screw 4 moves up and down. When the second gear 904 rotates counterclockwise, it will engage and drive the second rack 902 to move toward the outside of the support leg 2, thereby causing the extrusion bar 905 to move out of the support leg 2 and contact the pulling plate 11. When the support leg 2 needs to be retracted, the support leg 2 needs to be rotated inward, so the pulling plate 11 will squeeze the extrusion bar 905, causing the extrusion bar 905 to move into the built-in cavity 5, so that the second rack 902 can drive the second gear 904 to rotate clockwise, so that the screw 4 rotates to the initial position. In this way, the extended adjustment column 3 can be retracted to the initial position, which is convenient for the later use of the bracket.

[0064] The working principle of the bracket for the level plotter provided by the present invention is as follows: when the bracket is placed on a bumpy ground, if one leg 2 of the bracket is placed on a bump and tilted up, it will cause the side of the base 1 close to the bump to tilt upward;

[0065] At this time, the horizontal iron ball 101 will be displaced toward the side of the two arc-shaped extrusion plates 102 in the inclined direction under the action of inertia. Since the horizontal iron ball 101 is heavy, the displacement of the horizontal iron ball 101 will generate a thrust on the two arc-shaped extrusion plates 102, causing the two arc-shaped extrusion plates 102 to move toward the outside of the base 1. At the same time, the two push rods 103 will also move outward and generate a thrust on the upper side of the rotating plate 707.

[0066] At this time, the rotating plate 707 rotates counterclockwise with the hinge seat 706 as the rotating point, so that the lower side of the rotating plate 707 will form a thrust on the push plate 708, so that the push plate 708 forms a downward thrust on the connecting plate 705, and the connecting plate 705 moves downward in the connecting groove 704, and the first rack 703 moves downward synchronously. At the same time, the spring 710 is stressed and contracts, and the first rack 703 synchronously meshes with the first gear 702 to rotate clockwise. The first gear 702 drives the second bevel gear 701 to rotate clockwise under the transmission of the shaft structure 8, and the first bevel gear 605 rotates counterclockwise under the transmission of the second bevel gear 701, so that the screw 4 pushes the adjustment column 3 to extend the support leg 2 a distance, so that the base 1 remains horizontal;

[0067] After the base 1 is adjusted to be horizontal, the horizontal iron ball 101 cannot form a thrust on the arc-shaped extrusion plate 102, and the push rod 103 no longer squeezes the upper side of the rotating plate 707. At this time, the spring 710 will cause the connecting plate 705 to form an upward displacement. When the first rack 703 moves upward, it will drive the first gear 702 to rotate counterclockwise. At this time, the driving rod 805 rotates counterclockwise in the driving cavity 803. Since the baffle 808 is provided on the side of the contact plate 807 facing the clockwise rotation direction of the second shaft body 802, the baffle 808 cannot form a block for the contact plate 807, so that the contact plate 807 rotates on the rotating seat 806 and cannot drive the second shaft body 802 to rotate. When the connecting plate 705 moves to the initial position, the first rack 703 is no longer in contact with the first gear 702.

[0068] When the screw 4 rotates counterclockwise, the second gear 904 on the screw 4 rotates synchronously. Since the thickness of the second rack 902 is greater than the thickness of the second gear 904, the second gear 904 can always engage with the second rack 902 when the screw 4 moves up and down. When the second gear 904 rotates counterclockwise, it will engage and drive the second rack 902 to move toward the outside of the support leg 2, thereby causing the extrusion bar 905 to move out of the support leg 2 and contact the pulling plate 11. When the support leg 2 needs to be retracted, the support leg 2 needs to be rotated inward, so the pulling plate 11 will squeeze the extrusion bar 905, causing the extrusion bar 905 to move into the built-in cavity 5, so that the second rack 902 can drive the second gear 904 to rotate clockwise, so that the screw 4 rotates to its initial position.

Claims

1. A support for a level surveying instrument, comprising a base (1), wherein the bottom of the base (1) is provided with three supporting feet (2) arranged in a circular array, a limiting plate (10) is provided between the three supporting feet (2), and three pulling plates (11) are hingedly connected between the three supporting feet (2) and the limiting plate (10), characterized in that: The lower sides of the three supporting legs (2) are each provided with an adjusting column (3), the upper end of the adjusting column (3) slides through the supporting leg (2), a built-in cavity (5) is provided in the supporting leg (2), the upper surface of the adjusting column (3) is rotatably connected to a screw rod (4), the upper end of the screw rod (4) is threadedly inserted into the built-in cavity (5), a connecting mechanism (6) for driving the screw rod (4) to rotate is provided in the built-in cavity (5), an extension driving mechanism (7) for driving the connecting mechanism (6) to rotate in the reverse direction is provided in the built-in cavity (5), the interior of the base (1) is hollow, a horizontal adjustment mechanism for driving the extension driving mechanism (7) to operate is provided in the base (1), and a retraction driving mechanism (9) for driving the screw rod (4) to return to its original position is provided in the built-in cavity (5); The connecting mechanism (6) comprises a rotating shaft (601), the upper end of the rotating shaft (601) is rotatably connected to the top inner wall of the built-in cavity (5), the upper surface of the screw rod (4) is provided with a movable groove (602), the lower end of the rotating shaft (601) extends into the movable groove (602) and slides in the movable groove (602), a plurality of limiting grooves (604) are provided on the inner wall of the movable groove (602), the limiting grooves (604) extend out of the upper surface of the screw rod (4), a limiting slider (603) is fixedly connected to the outer surface of the rotating shaft (601) near the limiting groove (604), the limiting slider (603) extends into the limiting groove (604) and slides in the limiting groove (604); The outer surface of the rotating shaft (601) is fixedly sleeved with a first bevel gear (605); the extension drive mechanism (7) comprises a second bevel gear (701) and a first gear (702); the second bevel gear (701) is arranged on the upper side of the first bevel gear (605) and is meshingly connected with the first bevel gear (605); the first gear (702) is provided with a shaft structure (8) for driving the second bevel gear (701) to rotate in the forward direction; and the outer side of the first gear (702) is meshingly connected with a first rack (703); The inner wall of the built-in cavity (5) near the first rack (703) is provided with a connecting groove (704) extending out of the outer surface of the support leg (2); a connecting plate (705) is fixedly connected to the surface of one side of the first rack (703) near the connecting groove (704); the other side of the connecting plate (705) extends out of the outer surface of the support leg (2) through the connecting groove (704); a hinge seat (706) is fixedly connected to the outer surface of the support leg (2); a rotating plate (707) is rotatably connected to the hinge seat (706); a push plate (708) is rotatably connected between the lower side of the rotating plate (707) and the side of the connecting plate (705) located outside the support leg (2); The horizontal adjustment mechanism comprises a horizontal iron ball (101), the horizontal iron ball (101) is placed at the center of the inner cavity of the base (1), three arc-shaped extrusion plates (102) arranged in a circular array are provided in the base (1), the three arc-shaped extrusion plates (102) can be combined into a circular ring, and the horizontal iron ball (101) is located at the center of the circular ring, and a push rod (103) is fixedly connected to the outer surface of the arc-shaped extrusion plate (102) facing away from the horizontal iron ball (101), and the other end of the push rod (103) slides through the outer surface of the base (1) and contacts the upper side of the rotating plate (707); The shaft structure (8) comprises a first shaft (801) and a second shaft (802), wherein one end of the first shaft (801) and the second shaft (802) are rotatably connected, the first gear (702) is fixedly sleeved on the outer surface of the first shaft (801), the second bevel gear (701) is fixedly sleeved on the outer surface of the second shaft (802), the other end of the first shaft (801) is rotatably connected to the inner wall of the built-in cavity (5), the second shaft (802) is provided with a driving cavity (803), a driving shaft (804) is fixedly connected to a surface of one side of the first shaft (801) close to the second shaft (802), the other end of the driving shaft (804) is rotatably inserted into the driving cavity (803), and the driving shaft (804) is A driving rod (805) is fixedly connected to the outer surface of the driving cavity (803); a plurality of rotating seats (806) in a circumferential array are fixedly connected to the annular inner wall of the driving cavity (803); a contact plate (807) is rotatably connected to the rotating seat (806); a torsion spring is provided between the contact plate (807) and the rotating seat (806); the contact plate (807) is vertically arranged under the action of the torsion spring; the other side of the driving rod (805) is in contact with the contact plate (807); a plurality of baffles (808) are fixedly connected to the annular inner wall of the driving cavity (803); the baffles (808) are provided on the side of the contact plate (807) facing the clockwise rotation direction of the second shaft body (802) and are in contact with the contact plate (807).

2. The bracket for a level mapping instrument according to claim 1, characterized in that: A limiting slide bar (709) is fixedly connected between the upper and lower inner walls of the connecting slide groove (704), the connecting plate (705) is slidably sleeved on the outer surface of the limiting slide bar (709), a spring (710) is fixedly connected between the lower surface of the connecting plate (705) and the bottom wall of the connecting slide groove (704), and the spring (710) is movably sleeved on the outer surface of the limiting slide bar (709).

3. The bracket for a level mapping instrument according to claim 1, characterized in that: A central groove (106) is provided at the center of the bottom wall of the base (1), the bottom of the horizontal iron ball (101) is arranged in the central groove (106), a magnet (104) for magnetically attracting the horizontal iron ball (101) is embedded on the inner wall of the central groove (106), and a notch (105) is provided at adjacent corners of the two arc-shaped extrusion plates (102).

4. The bracket for a level mapping instrument according to claim 3, characterized in that: The hinge seat (706) is arranged on a side of the rotating plate (707) close to the connecting plate (705).

5. The bracket for a level mapping instrument according to claim 1, characterized in that: The retraction drive mechanism (9) comprises a guide rail (901), the guide rail (901) being fixedly mounted on the bottom wall of the built-in cavity (5), a second rack (902) being provided on the guide rail (901), a guide rail joint (903) being embedded on the lower side of the second rack (902), the second rack (902) being slidably connected to the guide rail (901) via the guide rail joint (903), a second gear (904) being fixedly sleeved on the outer surface of the screw rod (4) located in the built-in cavity (5), the thickness of the second rack (902) being greater than the thickness of the second gear (904), an extrusion strip (905) being fixedly connected to the side surface of the second rack (902), the other side of the extrusion strip (905) slidingly passing through the outer surface of the support leg (2) and contacting the pulling plate (11).

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