Column type elevator

Abstract

The utility model discloses a column type elevator, which belongs to the technical field of elevators, solves the technical problems of complex structure and control system and poor stability of a hydraulic elevator, and comprises a transmission mechanism, an elevating mechanism and a support mechanism. The transmission mechanism is installed on the support mechanism, the support mechanism supports the lifting mechanism, conveyed materials are placed on a roller conveying line of the lifting mechanism, and the transmission mechanism drives the lifting mechanism to vertically ascend and descend. A transmission variable frequency motor is adopted to drive the lifting mechanism to vertically lift; the roller conveying line variable frequency motor drives the roller conveying line of the lifting mechanism to horizontally move front and back, lifting motion and horizontal front and back motion of conveyed materials are achieved, operation is stable and reliable, noise is low, precision is high, and performance is stable. The utility model is used for the automatic production line of automobile parts.

Description

Technical Field

[0001] This utility model belongs to the field of hoisting technology, specifically relating to a column-type hoist. Background Technology

[0002] Currently, scissor lifts achieve their lifting function through hydraulic oil pressure transmission. They typically feature a one-way cylinder. When the lift ascends, a vane pump outputs high-pressure oil, which enters the lower chamber of the cylinder through a control valve and pipeline, pushing the cylinder upwards and raising the lift. Conversely, when the lift descends, the vane pump outputs high-pressure oil, which enters the upper chamber of the cylinder through a control valve and pipeline, pushing the cylinder downwards and lowering the lift. Scissor lifts are complex in design, with hydraulic components such as the hydraulic tank, pump, solenoid directional valve, throttle valve, and pressure regulating valve, as well as electrical control components and systems. They also have a large footprint, are prone to oil leaks, have high spare parts costs, and exhibit poor stability. Utility Model Content

[0003] To overcome the shortcomings of hydraulic lifts due to their complex structure, this utility model proposes a column-type lift.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A column-mounted lifting platform includes a transmission mechanism, a lifting mechanism, and a support mechanism.

[0006] The transmission mechanism is mounted on the support mechanism, which supports the lifting mechanism. The transport material is placed on the roller conveyor line of the lifting mechanism, and the transmission mechanism drives the lifting mechanism to move vertically up and down.

[0007] The transmission mechanism includes a transmission frequency converter motor, a coupling, a T-type reducer, a connecting rod, a right turbine screw jack, a left turbine screw jack, a right turbine screw jack head flange, and a left turbine screw jack head flange.

[0008] The transmission variable frequency motor, T-type reducer, and connecting rod are connected in sequence via couplings. The connecting rod is connected to the right and left turbine screw jacks, respectively. The right and left turbine screw jacks are respectively installed in the head flanges of the right and left turbine screw jacks. The transmission variable frequency motor is used to drive the left and right columns of the lifting mechanism to move vertically and synchronously.

[0009] The lifting mechanism includes a left column, a right column, a left slider, a right slider, a variable frequency motor for the roller conveyor line, a roller conveyor line, a horizontal motion upper deceleration photoelectric switch, a horizontal motion upper stop photoelectric switch, a horizontal motion lower deceleration photoelectric switch, a horizontal motion lower stop photoelectric switch, and a lifting mechanism base plate.

[0010] The left and right columns of the lifting mechanism are connected to the left and right turbine screw jacks, respectively. The left and right sliders are connected to the support mechanism. The left and right columns, sliders, and slider are symmetrically installed at both ends of the lifting mechanism's base plate, with the left and right sliders located on the outer sides of the left and right columns, respectively. A roller conveyor line is installed in the middle of the lifting mechanism's base plate, and a variable frequency motor for the roller conveyor line is mounted on the base plate. This motor drives the horizontal forward and backward movement of the transported materials on the roller conveyor line.

[0011] The horizontal motion upper deceleration photoelectric switch, horizontal motion upper stop photoelectric switch, horizontal motion lower deceleration photoelectric switch, and horizontal motion lower stop photoelectric switch are all installed on the base plate of the lifting mechanism. They are used to limit the horizontal motion of the transported materials to the upper deceleration line, the upper stop line, the lower deceleration line, and the lower stop line, respectively.

[0012] In the aforementioned column-mounted lifting platform, the power of the transmission variable frequency motor and the speed ratio of the T-type reducer are set according to the weight of the transported material.

[0013] In the aforementioned column-mounted lifting platform, the T-type reducer is a variable frequency drive motor.

[0014] In the aforementioned column-mounted lifting platform, the power of the variable frequency motor of the roller conveyor line is set according to the weight of the transported material.

[0015] In the aforementioned column-mounted lifting platform, the distance between the horizontal movement upper deceleration photoelectric switch and the horizontal movement upper stop photoelectric switch, as well as the distance between the horizontal movement lower deceleration photoelectric switch and the horizontal movement lower stop photoelectric switch, is set according to the size of the transported material.

[0016] The aforementioned column-type lifting platform includes a support mechanism comprising a rear crossbeam, a front crossbeam, a left worm gear screw jack base, a right worm gear screw jack base, a T-type reducer base, a transmission frequency converter motor base, a left column of the support mechanism, a right column of the support mechanism, a control cabinet, a support mechanism return frame, an upward stop photoelectric switch, and a downward stop photoelectric switch.

[0017] The support mechanism's return frame is located at the lower end of the support mechanism; the left and right uprights of the support mechanism are symmetrically arranged on both sides of the support mechanism and are fixedly connected to the return frame; the rear and front crossbeams of the support mechanism are located at the upper end of the support mechanism and are fixedly connected to the left and right uprights of the support mechanism; the left and right turbine screw jack bases are symmetrically arranged; the left and right turbine screw jack bases, the T-type reducer base, and the transmission frequency converter motor base are fixedly installed on the rear and front crossbeams of the support mechanism.

[0018] The left turbine screw jack head flange, the right turbine screw jack head flange, the T-type reducer, and the transmission frequency converter motor are respectively installed on the left turbine screw jack base, the right turbine screw jack base, the T-type reducer base, and the transmission frequency converter motor base.

[0019] The control cabinet is installed on the right column of the support mechanism and is connected to the transmission frequency conversion motor, the roller conveyor frequency conversion motor, the horizontal movement upper deceleration photoelectric switch, the horizontal movement upper stop photoelectric switch, the horizontal movement lower deceleration photoelectric switch, the horizontal movement lower stop photoelectric switch, the rising stop photoelectric switch, and the falling stop photoelectric switch. It is used to control the vertical lifting and lowering movement of the transported materials, as well as the horizontal forward and backward movement of the roller conveyor.

[0020] The up-stop photoelectric switch and the down-stop photoelectric switch are installed on the left column of the support mechanism and are used to control the up-stop and down-stop of the right turbine screw jack and the left turbine screw jack.

[0021] The right turbine screw jack head flange and the left turbine screw jack head flange are respectively fixed on the right turbine screw jack base and the left turbine screw jack base.

[0022] In the aforementioned column-type lifting platform, the fixed connections between the transmission variable frequency motor base, the T-type reducer base, the right worm gear screw lifting platform base, and the left worm gear screw lifting platform base and the front support beam and the rear support beam, respectively, are welded.

[0023] The aforementioned column-type lifting platform has a fixed connection between the front crossbeam and rear crossbeam of the support and the left and right columns of the support mechanism, which is welded.

[0024] In the aforementioned column-type lifting platform, the front crossbeam and rear crossbeam of the support are fixedly connected to the left column and right column of the support mechanism by welding; the left column and right column of the support mechanism are fixedly connected to the frame of the support mechanism by welding.

[0025] The aforementioned column-mounted lifting platform further includes a base plate in its support mechanism. The base plate is located at the lower part of the support mechanism's retaining frame and is used to support the retaining frame. The base plate is welded and fixed to the retaining frame; the base plate is fixed to the ground.

[0026] The beneficial effects of this utility model are:

[0027] A column-mounted lifting platform includes a transmission mechanism, a lifting mechanism, and a support mechanism. The transmission mechanism and the lifting mechanism are the main components, while the support mechanism is the frame of the entire lifting platform to support the operation of other mechanisms. It has a simple structure and is easy to operate.

[0028] A column-mounted lifting platform enables the transportation of materials between automated production lines of different heights, or the transportation of materials between equipment of different heights and automated production lines.

[0029] A column-mounted lifting platform uses a variable frequency motor to achieve vertical lifting and horizontal forward and backward movement. It operates smoothly and reliably, with low noise, high precision, and stable performance.

[0030] A column-mounted lifting platform, which occupies a small area and is easy to maintain and service, can be used in automated production lines for automotive parts. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the column-type lifting platform of this utility model;

[0032] Figure 2 This is a schematic diagram of the transmission mechanism structure of this utility model;

[0033] Figure 3 This is a schematic diagram of the lifting mechanism of this utility model;

[0034] Figure 4 This is a schematic diagram of the support mechanism structure of this utility model;

[0035] Figure label:

[0036] 1. Transmission mechanism; 2. Lifting mechanism; 3. Support mechanism;

[0037] 10. Variable frequency drive motor; 11. Coupling; 12. T-type reducer; 13. Connecting rod; 14. Right worm gear screw jack; 15. Left worm gear screw jack; 16. Right worm gear screw jack head flange; 17. Left worm gear screw jack head flange.

[0038] 20. Left column of lifting mechanism; 21. Right column of lifting mechanism; 22. Left slider; 23. Right slider; 24. Variable frequency motor of roller conveyor line; 25. Roller conveyor line; 26. Horizontal movement upper deceleration photoelectric switch; 27. Upper line stop photoelectric switch; 28. Horizontal movement lower deceleration photoelectric switch; 29. ​​Lower line stop photoelectric switch; 201. Lifting mechanism base plate.

[0039] 30. Rear crossbeam of the support frame; 31. Front crossbeam of the support frame; 32. Left turbine screw jack base; 33. Right turbine screw jack base; 34. T-type reducer base; 35. Transmission frequency converter motor base; 36. Left column of the support mechanism; 37. Right column of the support mechanism; 38. Control cabinet; 39. Return frame of the support mechanism; 301. Foot; 302. Upward stop photoelectric switch; 303. Downward stop photoelectric switch. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Example

[0041] A type of column-mounted lift, such as Figure 1 As shown, it includes a transmission mechanism 1, a lifting mechanism 2, and a support mechanism 3;

[0042] The transmission mechanism 1 drives the lifting mechanism 2 to move vertically up and down, the roller conveyor line variable frequency motor 24 drives the roller conveyor line 25 to move horizontally back and forth, and the support mechanism 3 is the frame of the column-type lifting platform, supporting the movement of the lifting mechanism 2.

[0043] Transmission mechanism 1, as shown Figure 2 As shown, it includes a transmission variable frequency motor 10, a coupling 11, a T-type reducer 12, a connecting rod 13, a right worm gear screw jack 14, a left worm gear screw jack 15, a right worm gear screw jack head flange 16, and a left worm gear screw jack head flange 17.

[0044] The transmission variable frequency motor 10, coupling 11, T-type reducer 12, connecting rod 13, right worm screw jack 14 and left worm screw jack 15 form a complete transmission system;

[0045] The appropriate parameters, such as the power of the variable frequency motor and the speed ratio of the T-type reducer, can be selected based on the weight of the transported materials.

[0046] Lifting mechanism 2 Figure 3 As shown, it includes a left column 20 of the lifting mechanism, a right column 21 of the lifting mechanism, a left slider 22, a right slider 23, a variable frequency motor 24 for the roller conveyor line, a roller conveyor line 25, an upper deceleration photoelectric switch 26 for horizontal movement, an upper stop photoelectric switch 27, a lower deceleration photoelectric switch 28 for horizontal movement, a lower stop photoelectric switch 29, and a base plate 201 of the lifting mechanism.

[0047] The variable frequency motor 24 of the roller conveyor drives the material to move horizontally back and forth on the roller conveyor 25. The appropriate power parameters of the variable frequency motor 24 of the roller conveyor can be selected according to the weight of the transported material.

[0048] Based on the size of the transported material, select and adjust the running distance of the horizontal motion upper deceleration photoelectric switch 26, the horizontal motion upper stop photoelectric switch 27, and the running distance of the horizontal motion lower deceleration photoelectric switch 28 and the horizontal motion lower stop photoelectric switch 29.

[0049] Support mechanism 3 Figure 4As shown, the system includes a front crossbeam 31, a rear crossbeam 30, a left turbine screw jack base 32, a right turbine screw jack base 33, a T-type reducer base 34, a transmission frequency converter motor base 35, a left column 36 of the support mechanism, a right column 37 of the support mechanism, a control cabinet 38, a support mechanism return frame 39, a foot 301, an upward stop photoelectric switch 302, and a downward stop photoelectric switch 303.

[0050] The control cabinet 38 controls the vertical lifting movement of the elevator transporting materials, as well as the horizontal forward and backward movement of the roller conveyor line 25.

[0051] The distance between the ascending stop photoelectric switch 302 and the descending stop photoelectric switch 303 can be adjusted according to the different heights of the automated production line.

[0052] You can choose the appropriate tonnage of the 301 foot according to the weight of the transported materials, or you can install adjustable feet according to actual needs.

[0053] The T-type reducer 12 acts as a bridge between the drive variable frequency motor, the right worm gear screw jack 14, and the left worm gear screw jack 15, converting the horizontal motion of the drive variable frequency motor into the vertical motion of the right worm gear screw jack 14 and the left worm gear screw jack 15. The drive variable frequency motor 10 of the transmission mechanism 1 drives the entire lifting mechanism 2 to perform vertical lifting motion, thereby realizing the lifting motion of the lifting mechanism 2; the variable frequency motor 24 of the roller conveyor line drives the roller conveyor line 25 to move horizontally, realizing the transportation of materials between automated production lines at different heights, thereby realizing the material loading and unloading operations.

[0054] The transmission variable frequency motor 10 and the T-type reducer 12 are connected by a coupling 11; the T-type reducer 12 is connected to the left worm gear screw jack 15 and the right worm gear screw jack 14 by a connecting rod 13 and a coupling 11.

[0055] The variable frequency drive motor 10, the T-type reducer 12, the right worm gear screw jack 14 and the left worm gear screw jack 15 are respectively fixed on the variable frequency drive motor base 35, the T-type reducer base 34, the right worm gear screw jack base 33 and the left worm gear screw jack base 32 on the support mechanism 3; their bases are welded to the front crossbeam 31 and the rear crossbeam 30 of the support.

[0056] The front crossbeam 31 and the rear crossbeam 30 of the support are welded together with the left column 36 and the right column 37 of the support mechanism; the left column 36 and the right column 37 of the support mechanism are welded together with the bracket 39 of the support mechanism; the bracket 39 of the support mechanism is welded together with the foot 301; the foot 301 is fixed to the ground.

[0057] The horizontal motion loading deceleration photoelectric switch 26, the horizontal motion loading stop photoelectric switch 27, the horizontal motion unloading deceleration photoelectric switch 28, and the horizontal motion unloading stop photoelectric switch 29 on the roller conveyor line 25 can realize the deceleration and stopping of the loading or unloading materials.

[0058] The lifting mechanism 2 has an upward stop photoelectric switch 302 and a downward stop photoelectric switch 303, which realize the upward or downward movement of materials and enable the conveying of materials between automated production lines of different heights.

[0059] The working process of a column-mounted lifting platform is as follows:

[0060] Reference Figure 1 Viewed from the front (control cabinet on the right), a column-mounted lift is located between the first and second automated workstations, with the height of the first automated workstation being lower than that of the second automated workstation. The first workstation is the workstation directly in front of the column-mounted lift (hereinafter referred to as: the first workstation), and the second workstation is the workstation directly behind the column-mounted lift (hereinafter referred to as: the second workstation).

[0061] Material moves from the first station to the roller conveyor line 25. The roller conveyor line's variable frequency motor 24 activates, and the material moves along the conveyor line. When the material reaches the material upper deceleration photoelectric switch 26, the roller conveyor line 25 decelerates until it reaches the upper stop photoelectric switch 27, at which point the roller conveyor line 25 stops. The lifting mechanism 2, which loads the material, rises. When the lifting mechanism 2 reaches the rising stop photoelectric switch 27, the lifting mechanism 2 stops. The roller conveyor line 25 then operates, transporting the material from the roller conveyor line 25 to the second station, thus completing the loading process.

[0062] After the material is assembled at the second station, a column-type lifting platform is at the upward stop photoelectric switch 302. The material moves from the second station to the roller conveyor line 25. The roller conveyor line's variable frequency motor 24 actuates, and the material moves on the roller conveyor line 25. When the material reaches the material lowering deceleration photoelectric switch 28, the roller conveyor line 25 decelerates until it reaches the lowering stop photoelectric switch 29, at which point the roller conveyor line 25 stops working. The lifting mechanism 2, which loads the material, descends. When the lifting mechanism 2 descends to the descent stop photoelectric switch 303, the lifting mechanism 2 stops working. The roller conveyor line 25 then operates, transporting the material from the roller conveyor line 25 to the first station, thus completing the unloading process.

[0063] If the first workstation is higher than the second workstation, the work process is similar.

[0064] Based on the weight of the transported materials, a suitable variable frequency drive motor 10 can be selected.

[0065] Based on the size of the transported materials, select and adjust the operating distance of the material loading deceleration photoelectric switch 26, the material loading stop photoelectric switch 27, and the material unloading deceleration photoelectric switch 28 and the unloading stop photoelectric switch 29.

[0066] Adjust the distance between the ascending stop photoelectric switch 302 and the descending stop photoelectric switch 303 according to the different heights of the automated production line.

[0067] Choose the appropriate tonnage of the feet based on the weight of the transported materials, or install feet with adjustable distances as needed.

[0068] The roller conveyor line 25 from the first station to the lifting mechanism 2 needs to be leveled; the roller conveyor line from the second station to the lifting mechanism 2 also needs to be leveled.

Claims

1. A column lift, characterized by, Includes transmission mechanism (1), lifting mechanism (2), and support mechanism (3); The transmission mechanism (1) is installed on the support mechanism (3), the support mechanism (3) supports the lifting mechanism (2), the transport material is placed on the roller conveyor line (25) of the lifting mechanism (2), and the transmission mechanism (1) drives the lifting mechanism (2) to move vertically up and down; The transmission mechanism (1) includes a transmission variable frequency motor (10), a coupling (11), a T-type reducer (12), a connecting rod (13), a right turbine screw jack (14), a left turbine screw jack (15), a right turbine screw jack head flange (16), and a left turbine screw jack head flange (17). The transmission variable frequency motor (10), T-type reducer (12), and connecting rod (13) are connected in sequence by coupling (11). The connecting rod (13) is connected to the right turbine screw jack (14) and the left turbine screw jack (15) respectively. The right turbine screw jack (14) and the left turbine screw jack (15) are respectively installed in the head flange (16) of the right turbine screw jack and the head flange (17) of the left turbine screw jack. The transmission variable frequency motor (10) is used to drive the left column (20) and the right column (21) of the lifting mechanism (2) to move vertically and synchronously. The lifting mechanism (2) includes a left column (20), a right column (21), a left slider (22), a right slider (23), a variable frequency motor (24) for the roller conveyor line, a roller conveyor line (25), a horizontal motion upper deceleration photoelectric switch (26), a horizontal motion upper stop photoelectric switch (27), a horizontal motion lower deceleration photoelectric switch (28), a horizontal motion lower stop photoelectric switch (29), and a lifting mechanism base plate (201). The left column (20) and right column (21) of the lifting mechanism are connected to the left turbine screw jack (15) and right turbine screw jack (14) respectively; the left slider (22) and right slider (23) are connected to the support mechanism (3); the left column (20), right column (21), left slider (22), and right slider (23) of the lifting mechanism are symmetrically installed at both ends of the lifting mechanism base plate (201), and the left slider (22) and right slider (23) are located on the outside of the left column (20) and right column (21) of the lifting mechanism respectively; the roller conveyor line (25) is installed in the middle of the lifting mechanism base plate (201), and the roller conveyor line variable frequency motor (24) is installed on the lifting mechanism base plate (201). The roller conveyor line variable frequency motor (24) is used to drive the transported materials on the roller conveyor line (25) to move horizontally back and forth; The horizontal motion upper deceleration photoelectric switch (26), the horizontal motion upper stop photoelectric switch (27), the horizontal motion lower deceleration photoelectric switch (28), and the horizontal motion lower stop photoelectric switch (29) are all installed on the lifting mechanism base plate (201); they are used to limit the horizontal motion upper deceleration, horizontal motion upper stop, horizontal motion lower deceleration, and horizontal motion lower stop of the transported materials, respectively.

2. The column lift of claim 1, wherein, The power of the transmission variable frequency motor (10) and the speed ratio of the T-type reducer (12) are set according to the weight of the transported material.

3. The column lift of claim 1, wherein, The T-type reducer (12) is a bridge between the transmission variable frequency motor (10), the right turbine screw jack (14) and the left turbine screw jack (15), converting the horizontal motion of the transmission variable frequency motor (10) into the lifting motion of the right turbine screw jack (14) and the left turbine screw jack (15).

4. The column lift of claim 1, wherein, The power of the variable frequency motor (24) of the roller conveyor line is set by the weight of the transported material.

5. The column lift of claim 1, wherein, The distance between the horizontal motion upper deceleration photoelectric switch (26) and the horizontal motion upper stop photoelectric switch (27), and the distance between the horizontal motion lower deceleration photoelectric switch (28) and the horizontal motion lower stop photoelectric switch (29) are set by the size of the transported material.

6. The column lift of claim 1, wherein, The support mechanism (3) includes a front crossbeam (31), a rear crossbeam (30), a left turbine screw jack base (32), a right turbine screw jack base (33), a T-type reducer base (34), a transmission frequency converter motor base (35), a left column (36), a right column (37), a control cabinet (38), a support mechanism return frame (39), an upward stop photoelectric switch (302), and a downward stop photoelectric switch (303). The support mechanism return frame (39) is located at the lower end of the support mechanism (3); the left column (36) and right column (37) of the support mechanism are symmetrically arranged on both sides of the support mechanism (3) and are fixedly connected to the support mechanism return frame (39); the rear crossbeam (30) and front crossbeam (31) of the support are located at the upper end of the support mechanism (3) and are fixedly connected to the left column (36) and right column (37) of the support mechanism; the left turbine screw jack base (32) and right turbine screw jack base (33) are symmetrically arranged; the left turbine screw jack base (32), right turbine screw jack base (33), T-type reducer base (34), and transmission frequency converter motor base (35) are fixedly installed on the front crossbeam (31) and rear crossbeam (30) of the support; The left turbine screw jack head flange (17), the right turbine screw jack head flange (16), the T-type reducer (12), and the transmission frequency converter motor (10) are respectively installed on the left turbine screw jack base (32), the right turbine screw jack base (33), the T-type reducer base (34), and the transmission frequency converter motor base (35); The control cabinet (38) is installed on the right column (37) of the support mechanism and is connected to the transmission frequency conversion motor (10), the roller conveyor line frequency conversion motor (24), the horizontal motion upper deceleration photoelectric switch (26), the horizontal motion upper stop photoelectric switch (27), the horizontal motion lower deceleration photoelectric switch (28), the horizontal motion lower stop photoelectric switch (29), the rising stop photoelectric switch (302), and the falling stop photoelectric switch (303). It is used to control the vertical lifting and lowering movement of the transported materials and the horizontal forward and backward movement of the roller conveyor line (25). The rising stop photoelectric switch (302) and the falling stop photoelectric switch (303) are installed on the left column (36) of the support mechanism and are used to control the rising stop and falling stop of the lifting mechanism (2); The right turbine screw jack head flange (16) and the left turbine screw jack head flange (17) are respectively fixed on the right turbine screw jack base (33) and the left turbine screw jack base (32).

7. The column lift of claim 6, wherein, The fixed connections between the transmission variable frequency motor base (35), the T-type reducer base (34), the right turbine screw jack base (33), and the left turbine screw jack base (32) and the front support beam and the rear support beam, respectively, are welded.

8. The column lift of claim 6, wherein, The fixed connection between the front crossbeam (31) and rear crossbeam (30) of the support and the left column (36) and right column (37) of the support mechanism is welding.

9. The column lift of claim 6, wherein, The front crossbeam (31) and rear crossbeam (30) of the support are fixedly connected to the left column (36) and right column (37) of the support mechanism by welding; the left column (36) and right column (37) of the support mechanism are fixedly connected to the back frame (39) of the support mechanism by welding.

10. The column lift of claim 1, wherein, The support mechanism (3) also includes a foot (301); The foot (301) is located at the lower part of the support mechanism return frame (39) and is used to support the support mechanism return frame (39). The foot (301) is welded and fixed to the support mechanism return frame (39). The foot (301) is fixed to the ground.

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