Electric wheel stretcher positioning structure and electric wheel stretcher

Abstract

The utility model provides an electric wheel stretcher positioning structure and an electric wheel stretcher, and relates to the technical field of electric wheel stretchers. The electric wheel stretcher positioning structure comprises a base and a spring bolt, the base is installed on the frame and provided with a first through hole, a steering shaft of a universal wheel penetrates through the first through hole so that the steering shaft can be rotationally connected with the base, a limiting notch is formed in the circumferential direction of the steering shaft, the spring bolt is rotationally connected with the base, and the spring bolt is arranged in the limiting notch. The rotating axis of the spring bolt is perpendicular to the axis of the steering shaft, and the spring bolt is used for being connected with the limiting notch in a clamped mode. When the electric wheel stretcher is parked, the lock tongues can limit rotation of the universal wheels from the circumferential directions of the universal wheels, so that clamping connection between the lock tongues and the universal wheels is achieved, rotation of the universal wheels is avoided, and the stability of the electric wheel stretcher is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric stretcher vehicles, in particular to an electric stretcher vehicle positioning structure and an electric stretcher vehicle. Background Art

[0002] Universal wheels are a common wheel structure for electric stretchers and other medical equipment. Electric stretchers can be steered by rotating universal wheels. However, since the rotation of universal wheels is relatively flexible, the stability of electric stretchers may be poor. For example, when carrying a wounded person, the electric stretcher is parked at the wounded person's location, and medical staff usually lift the wounded person onto the electric stretcher from the side. If the universal wheel rotates, the wounded person will be touched, and the electric stretcher will shift, making it impossible to ensure that the wounded person is effectively lifted onto the electric stretcher. Utility Model Content

[0003] The problem solved by the utility model is how to improve the stability of an electric stretcher.

[0004] To solve the above problems, on the one hand, the utility model provides an electric stretcher trolley positioning structure, which is used to be installed on the frame of the stretcher trolley, including a base and a locking tongue. The base is installed on the frame and is provided with a first through hole. The first through hole is used for the steering shaft of the universal wheel to pass through so as to realize the rotational connection between the steering shaft and the base. A limiting notch is provided in the circumference of the steering shaft. The locking tongue is rotationally connected to the base, and the rotation axis of the locking tongue is perpendicular to the axis of the steering shaft. The locking tongue is used to engage with the limiting notch.

[0005] Optionally, the electric stretcher trolley positioning structure further includes a driving assembly, and the driving assembly is used to drive the locking tongue to rotate so that the locking tongue is engaged with or released from the limiting notch.

[0006] Optionally, the driving assembly includes an elastic telescopic rod, a locking shaft and a pedal. The locking shaft can be rotatably connected to the base around its own axis. The pedal is installed on the locking shaft and is used to drive the locking shaft to rotate. The elastic telescopic rod is installed on the end face of the locking shaft, and the center axis of the elastic telescopic rod is parallel to the axis of the locking shaft and is not in a straight line. The elastic telescopic rod is telescopic relative to the locking shaft to drive the lock tongue to rotate.

[0007] Optionally, the base is provided with a second through hole, one end of the lock shaft passes through the second through hole and is arranged toward the lock tongue so that the elastic telescopic rod is against the lock tongue; when the elastic telescopic rod is against the rotation axis of the lock tongue, the elastic telescopic rod is in a compressed state; when the elastic telescopic rod rotates with the lock shaft to gradually move away from the rotation axis of the lock tongue, the elastic telescopic rod releases elastic potential energy to drive the lock tongue to rotate around its rotation axis.

[0008] Optionally, the rotation axis of the lock tongue is located in the middle of the lock tongue, and a side of the lock tongue facing the lock shaft is configured as an arc-shaped surface structure.

[0009] Optionally, a mounting groove is provided on the end surface of the lock shaft, and the elastic telescopic rod is installed in the mounting groove.

[0010] Optionally, the elastic telescopic rod includes a lock core and a spring with one end sleeved on the lock core, and the other end of the spring is installed in the installation groove.

[0011] Optionally, a spherical structure is provided at one end of the elastic telescopic rod facing the arc surface structure, and the elastic telescopic rod is in sliding contact with the arc surface structure through the spherical structure.

[0012] Compared with the prior art, the electric stretcher trolley positioning structure of the utility model is rotatably connected to the steering shaft of the universal wheel through a first through hole of a base installed on the frame, so that the base provides an installation position for the universal wheel on the frame, and then a limiting notch is set on the circumference of the steering shaft of the universal wheel, and the locking tongue is rotatably connected to the base, and the rotation axis of the locking tongue is perpendicular to the axis of the steering shaft of the universal wheel, so that the rotation plane of the locking tongue is perpendicular to the rotation plane of the steering shaft. In this way, when the electric stretcher trolley is parked, the locking tongue can be embedded in the limiting notch on the circumference of the steering shaft by rotating the locking tongue to limit the rotation of the universal wheel, thereby improving the stability of the electric stretcher trolley when it is parked.

[0013] On the other hand, the utility model further provides an electric stretcher trolley, comprising the electric stretcher trolley positioning structure as described above.

[0014] The advantages of the electric stretcher and the positioning structure of the electric stretcher over the prior art are the same and will not be described in detail here.

[0015] Optionally, two electric stretcher trolley positioning structures are provided, and the two electric stretcher trolley positioning structures are connected via the same locking shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 An exploded view of the positioning structure of the electric stretcher in an embodiment of the utility model;

[0017] Figure 2It is an assembly diagram of the positioning structure of the electric stretcher in the embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the unlocked state of the positioning structure of the electric stretcher in the embodiment of the utility model;

[0019] Figure 4 It is a schematic diagram of the locked state of the positioning structure of the electric stretcher in the embodiment of the utility model.

[0020] Description of reference numerals:

[0021] 1-base; 11-first through hole; 12-support frame; 2-lock tongue; 21-arc surface structure; 3-side plate; 4-lock cylinder; 41-spherical structure; 5-lock shaft; 51-bending structure; 6-pedal; 61-anti-slip structure; 7-spring; 10-frame; 20-steering shaft; 30-limiting notch. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] In the accompanying drawings, the Z axis represents the vertical direction, that is, the up and down position, and the positive direction of the Z axis (that is, the direction of the arrow of the Z axis) represents the top, and the negative direction of the Z axis (that is, the direction opposite to the positive direction of the Z axis) represents the bottom; the X axis in the accompanying drawings represents the horizontal position, and the positive direction of the X axis (that is, the direction of the arrow of the X axis) represents the right side, and the negative direction of the X axis (that is, the direction opposite to the positive direction of the X axis) represents the left side; the Y axis in the accompanying drawings represents the front and back position, and the positive direction of the Y axis (that is, the direction of the arrow of the Y axis) represents the front side, and the negative direction of the Y axis (that is, the direction opposite to the positive direction of the Y axis) represents the back side. It should also be noted that the aforementioned Z axis, X axis and Y axis are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the utility model.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data in this way can be interchanged under appropriate circumstances, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0025] Combination Figures 1 to 4As shown, the utility model provides an electric stretcher trolley positioning structure, which is used to be installed on a frame 10 of the stretcher trolley, and includes a base 1 and a locking tongue 2. The base 1 is installed on the frame 10 and is provided with a first through hole 11. The first through hole 11 is used for the steering shaft 20 of the universal wheel to pass through, so as to realize the rotational connection between the steering shaft 20 and the base 1. A limiting notch 30 is provided in the circumference of the steering shaft 20. The locking tongue 2 is rotationally connected to the base 1, and the rotation axis of the locking tongue 2 is perpendicular to the axis of the steering shaft 20. The locking tongue 2 is used to engage with the limiting notch 30.

[0026] Specifically, the base 1 is installed at the bottom of the frame 10 by bolts, and a first through hole 11 is provided on the base 1. The steering shaft 20 of the universal wheel is rotatably assembled in the first through hole 11 through a bearing and extends out of the first through hole 11. A limited notch 30 is provided in the circumferential direction of the steering shaft 20 of the universal wheel. Two support frames 12 can be welded on the base 1, and the two support frames 12 are parallel. The lock tongue 2 is a block structure, and the lock tongue 2 is located between the two support frames 12. The middle part of the lock tongue 2 can be rotatably connected between the two support frames 12 by a pin shaft, and the rotation axis of the lock tongue 2 is aligned with the first through hole 11. The axis of the universal wheel is perpendicular to the axis of the universal wheel. When the lock tongue 2 rotates toward the steering shaft 20 of the universal wheel, the end of the lock tongue 2 can be embedded in the limiting notch 30 on the universal wheel to complete the clamping connection between the lock tongue 2 and the universal wheel 20, so that the lock tongue 2 can limit the rotation of the universal wheel in the circumferential direction of the universal wheel steering shaft 20 to complete the locking of the universal wheel steering. The setting method of the limiting notch 30 can be to set a disk on the steering shaft 20 and set the limiting notch 30 on the edge of the disk along the circumference of the disk, or the limiting notch 30 can be processed on the circumferential side wall of the steering shaft 20. When unlocking, the lock tongue 2 is reset and rotated to separate the end of the lock tongue 2 from the limiting notch 30. Among them, a plurality of limiting notches 30 can be arranged at intervals on the circumference of the steering shaft 20, so that when the universal wheel 20 rotates to various angles, there is always a limiting notch 30 that is aligned with the locking tongue 2. In addition, if the limiting notch 30 on the universal wheel 20 is not aligned with the locking tongue 2, after the electric stretcher vehicle is parked at the designated position, the steering shaft 20 of the universal wheel can be manually rotated to align the limiting notch 30 with the locking tongue 2.

[0027] Therefore, in this embodiment, the first through hole 11 of the base 1 installed on the frame 10 is rotatably connected to the steering shaft 20 of the universal wheel, so that the base 1 provides an installation position for the universal wheel on the frame 10, and then a limiting notch 30 is set on the circumference of the steering shaft 20 of the universal wheel, and the lock tongue 2 is rotatably connected to the base 1, and the rotation axis of the lock tongue 2 is perpendicular to the axis of the steering shaft 20 of the universal wheel, so that the rotation plane of the lock tongue 2 is perpendicular to the rotation plane of the steering shaft 20. In this way, when the electric stretcher is parked, the lock tongue 2 can be embedded in the limiting notch 30 on the circumference of the steering shaft 20 by rotating the lock tongue 2 to limit the rotation of the universal wheel, thereby improving the stability of the electric stretcher when it is parked.

[0028] Optionally, the electric stretcher trolley positioning structure further includes a driving assembly, which is used to drive the locking tongue 2 to rotate so that the locking tongue 2 is engaged with or released from the limiting notch 30.

[0029] Specifically, when the electric stretcher is parked, the drive assembly drives the lock tongue 2 to rotate toward the limiting notch 30 so that the lock tongue 2 is engaged with the limiting notch 30, thereby ensuring the stability of the parking of the electric stretcher; when the electric stretcher is moving, the drive assembly drives the lock tongue 2 to rotate away from the limiting notch 30 so that the lock tongue 2 is released from the limiting notch 30, so that the steering shaft 20 of the universal wheel can rotate freely, thereby enabling the universal wheel to steer when in use.

[0030] In this way, the driving component is used to drive the locking tongue 2 to rotate so that the locking tongue 2 and the limiting notch 30 can be engaged or disengaged. In this way, not only can the locking tongue 2 and the limiting notch 30 be engaged by the driving component, but the engagement between the locking tongue 2 and the limiting notch 30 can also be disengaged by the driving component, thereby meeting the convenience of use of the electric stretcher when parking or moving.

[0031] Optionally, combined Figure 1 As shown, the driving assembly includes an elastic telescopic rod, a locking shaft 5 and a pedal 6. The locking shaft 5 is rotatably connected to the base 1 around its own axis. The pedal 6 is installed on the locking shaft 5 and is used to drive the locking shaft 5 to rotate. The elastic telescopic rod is installed on the end surface of the locking shaft 5, and the central axis of the elastic telescopic rod is parallel to the axis of the locking shaft 5 and is not in a straight line. The elastic telescopic rod is telescopic relative to the locking shaft 5 to drive the lock tongue 2 to rotate.

[0032] Specifically, the pedal 6 is mounted on the lock shaft 5, and a circumferential force can be applied to the lock shaft 5 through the pedal 6 to drive the lock shaft 5 to rotate. The lock shaft 5 is connected to the base 1 through a bearing so as to be rotatable around its own axis. The elastic telescopic rod is installed on the axial end face of the lock shaft 5, and the central axis of the elastic telescopic rod is parallel to the axis of the lock shaft 5 and is not in a straight line, that is, the elastic telescopic rod is non-coaxially arranged with the lock shaft 5, that is, the axis of the elastic telescopic rod is parallel to the axis of the lock shaft 5, so that when the lock shaft 5 rotates around its own axis, the elastic telescopic rod can be driven to make a curved motion along the circumference of the lock shaft 5, and the elastic The process of the telescopic rod making a curved motion can be the extension and retraction relative to the lock shaft 5. For example, the elastic telescopic rod is compressed and then released, and then the elastic telescopic rod is extended and retracted relative to the lock shaft 5 to drive the lock tongue 2 to rotate. For example, initially, the elastic telescopic rod is in a compressed and limited state and does not work on the lock tongue 2. As the lock shaft 5 rotates, the elastic telescopic rod is released from the compressed and limited state and acts on the end (tongue tip) of the lock tongue. At this time, the elastic telescopic rod can gradually extend and push the end (tongue tip) of the lock tongue to move, so that the end (tongue tip) of the lock tongue rotates around its rotation axis.

[0033] In this way, the pedal 6 that drives the lock shaft 5 to rotate can realize the rotation of the lock shaft 5 around its own axis on the base 1, and the elastic telescopic rod is installed on the end face of the lock shaft 5, and the central axis of the elastic telescopic rod is parallel to the axis of the lock shaft 5 and is not in a straight line, so that the rotation of the lock shaft 5 around its own axis is converted into the movement of the elastic telescopic rod in the circumferential direction of the lock shaft 5, and then the elastic telescopic rod is extended and retracted relative to the lock shaft 5 to drive the lock tongue 2 to rotate, thereby realizing the engagement or release of the lock tongue 2 and the limiting notch 30. In this way, medical staff can realize the rotation of the lock tongue 2 by stepping on the pedal 6, which is convenient and quick.

[0034] Optionally, combined Figure 1 As shown, the base 1 is provided with a second through hole, one end of the lock shaft 5 passes through the second through hole and is arranged toward the lock tongue 2 so that the elastic telescopic rod abuts against the lock tongue; when the elastic telescopic rod abuts against the rotation axis of the lock tongue, the elastic telescopic rod is in a compressed state; when the elastic telescopic rod rotates with the lock shaft 5 to gradually move away from the rotation axis of the lock tongue, the elastic telescopic rod releases elastic potential energy to drive the lock tongue to rotate around its rotation axis.

[0035] Specifically, the base 1 includes a horizontal plate and a side plate 3 vertically connected to the horizontal plate, a first through hole 11 is arranged on the horizontal plate, a second through hole is arranged on the side plate 3, an axis of the first through hole 11 is perpendicular to the axis of the second through hole, one end of the lock shaft 5 passes through the second through hole and is arranged toward the lock tongue 2 so that the elastic telescopic rod abuts against the lock tongue 2, and the center line of the elastic telescopic rod is perpendicular to the rotation axis of the lock tongue 2. When the end of the elastic telescopic rod away from the lock shaft 5 abuts against the rotation axis of the lock tongue 2, the elastic telescopic rod is in a compressed state. And because the center line of the elastic telescopic rod is coplanar with the rotation axis of the lock tongue 2 at this time, that is, the elastic force of the elastic telescopic rod is coplanar with the rotation axis of the lock tongue 2, the torque applied to the lock tongue 2 is zero and it will not rotate; when the elastic telescopic rod rotates with the lock shaft 5 to gradually move away from the rotation axis of the lock tongue 2, the elastic force of the elastic telescopic rod is not coplanar with the rotation axis of the lock tongue 2, and the lock tongue 2 can rotate under the action of the elastic force of the elastic telescopic rod. As the elastic telescopic rod stretches and releases its elastic potential energy, it can drive the lock tongue 2 to rotate around its rotation axis.

[0036] In this way, one end of the lock shaft 5 passes through the second through hole of the base 1 and is arranged toward the lock tongue 2 so that the elastic telescopic rod is against the lock tongue 2; when the elastic telescopic rod is against the rotation axis of the lock tongue 2, the elastic telescopic rod is in a compressed state; when the elastic telescopic rod rotates with the lock shaft 5 to gradually move away from the rotation axis of the lock tongue 2, the elastic telescopic rod releases its elastic property to drive the lock tongue 2 to rotate around its rotation axis, so that when the elastic telescopic rod is against the rotation axis of the lock tongue 2, the storage of elastic potential energy is achieved, and when the elastic telescopic rod rotates with the lock shaft 5 to gradually move away from the rotation axis of the lock tongue 2, the stored elastic potential energy can be released, so that the rotation of the lock tongue 2 can be quickly achieved by releasing the elastic potential energy.

[0037] Optionally, combined Figure 1 As shown, the rotation axis of the lock tongue 2 is located in the middle of the lock tongue 2 , and the side of the lock tongue 2 facing the lock shaft 5 is arranged as an arc surface structure 21 .

[0038] Specifically, the middle part of the arc surface structure 21 is located at the rotation axis of the lock tongue 2, and can extend to the upper and lower sides of the rotation axis of the lock tongue 2, and the convex position of the arc surface structure 21 is located at the rotation axis of the lock tongue 2. Initially, the elastic telescopic rod is against the convex position of the arc surface structure 21. When locking, the pedal 6 drives the lock shaft 5 to rotate, and the lock shaft 5 drives the elastic telescopic rod away from the convex position of the arc surface structure 21. The distance between the arc surface structure 21 and the elastic telescopic rod gradually increases, realizing the release of elastic potential energy while allowing the elastic telescopic rod to slide on the arc surface structure 21, thereby realizing the rotation of the lock tongue 2.

[0039] In this way, the rotation axis of the lock tongue 2 is located in the middle of the lock tongue 2, and the side of the lock tongue 2 facing the lock shaft 5 is set to a curved surface structure 21, so that the elastic telescopic rod can slide on the curved surface structure 21 through the release of elastic potential energy, so that the elastic telescopic rod can move under the guidance of the extension direction of the curved surface structure 21, so as to improve the efficiency of releasing the elastic potential energy of the elastic telescopic rod.

[0040] Optionally, combined Figure 1 As shown, a mounting groove 52 is provided on the end surface of the lock shaft 5 , and the elastic telescopic rod is installed in the mounting groove 52 .

[0041] Specifically, a mounting groove 52 is provided on the circumferential end surface of the lock shaft 5 , the groove depth direction of the mounting groove 52 is consistent with the axial direction of the lock shaft 5 , and the elastic telescopic rod is installed in the mounting groove 52 to be retracted in the mounting groove 52 .

[0042] Thus, the end surface of the lock shaft 5 is provided with a mounting groove 52, and the elastic telescopic rod is installed in the mounting groove 52. The mounting groove 52 limits the bending of the elastic telescopic rod in its radial direction to improve the stability of the elastic telescopic rod.

[0043] Optionally, combined Figure 1 As shown, the elastic telescopic rod includes a lock core 4 and a spring 7 with one end sleeved on the lock core 4, and the other end of the spring 7 is installed in the installation groove 52. Specifically, the groove depth direction of the installation groove is consistent with the axial direction of the lock core 4, the spring 7 is installed between the groove bottom of the installation groove and the lock core 4, and the spring 7 is telescoped in the installation groove 52. In this way, the structure of the elastic telescopic rod is simple, and the spring 7 sleeved on the lock core 4 is telescoped in the installation groove 52, and the installation groove 52 limits the deviation of the spring 7 in its radial direction, thereby overcoming the deformation of the spring 7 in its radial direction caused by the rotation of the lock shaft 5, thereby improving the use stability of the spring 7.

[0044] Optionally, combined Figure 1 As shown, a spherical structure 41 is provided at one end of the elastic telescopic rod facing the arc surface structure 21 , and the elastic telescopic rod is in sliding contact with the arc surface structure 21 through the spherical structure 41 .

[0045] Optionally, the lock core 4 is slidably connected to the mounting groove 52. Specifically, one end of the spring 7 is fixed to the bottom of the mounting groove 52, and the other end is fitted with the lock core 4, and the lock core 4 is slidably connected to the inner wall of the mounting groove 52. In this way, the lock core 4 is slidably connected to the mounting groove 52, and the mounting groove 52 guides the movement of the lock core 4, so that the mounting groove can limit the bending of the lock core 4 in its radial direction, so as to improve the strength of the lock core 4.

[0046] Optionally, combined Figure 1 As shown, a spherical structure 41 is provided at one end of the elastic telescopic rod facing the arc surface structure 21 , and the elastic telescopic rod is in sliding contact with the arc surface structure 21 through the spherical structure 41 .

[0047] Specifically, a spherical surface structure 41 is provided at one end of the lock core 4 facing the arc surface structure 21, and the lock core 4 is slidably connected to the arc surface structure 21 through the spherical surface structure 41. In this way, the spherical surface structure 41 realizes a point-to-surface structure between the lock core 4 and the arc surface structure 21 to reduce sliding friction, thereby improving the sliding efficiency of the lock core 4.

[0048] Optionally, combined Figure 1 As shown, an anti-slip structure 61 is provided on the pedal 6 .

[0049] Specifically, the pedal 6 includes a tread surface that contacts the sole, and the anti-skid structure 61 can be composed of a plurality of parallel protrusions and is arranged on the tread surface. In this way, the anti-skid structure 61 increases the roughness of contact with the sole and improves the reliability of the pedal 6 when treading.

[0050] Another embodiment of the utility model further provides an electric stretcher, comprising the electric stretcher positioning structure as above.

[0051] The advantages of the electric stretcher and the positioning structure of the electric stretcher over the prior art are the same and will not be described in detail here.

[0052] Optionally, combined Figure 1 to Figure 2 As shown, two electric stretcher trolley positioning structures are provided, and the two electric stretcher trolley positioning structures are connected by the same locking shaft 5.

[0053] Specifically, the base 1, the lock tongue 2, the side plate 3, the pedal 6 and the lock core 4 are connected one by one to achieve the locking of only one universal wheel 20, the lock shaft 5 extends along the width direction of the frame 10, and the base 1, the lock tongue 2, the side plate 3, the pedal 6 and the lock core 4 are respectively arranged at both ends of the extension direction of the lock shaft 5. In this way, through the rotation of the lock shaft 5, the locking of the two universal wheels 20 can be achieved at the same time, thereby improving the locking efficiency of the universal wheels 20.

[0054] Optionally, combined Figures 2 to 4 As shown, a bending structure 51 is provided on the lock shaft 5 , and the bending structure 51 extends to the bottom of the frame 10 and is used to abut against the frame 10 to limit the rotation of the lock shaft 5 .

[0055] Specifically, the lock shaft 5 includes two straight segments and a bending structure 51, and the bending structure 51 is connected between the two straight segments, and a pedal 6 is installed on each of the two straight segments. The bending structure 51 extends to the bottom of the frame 10, and when the pedal 6 is stepped on downward, the bending structure 51 rotates upward, and when the elastic telescopic rod drives the lock tongue 2 to engage with the limiting notch 30, the bending structure 51 abuts against the frame 10 to limit the continued rotation of the lock shaft 5. In this way, during the locking process, the bending structure 51 extends to the bottom of the frame 10 and is used to abut against the frame 10 to limit the rotation of the lock shaft 5, so as to prevent the user from continuing to step on the pedal 6, which may cause the elastic telescopic rod to be separated from the lock tongue 2, and the bending structure 51 can provide feedback to the user through the pedal 6 to improve the reliability of the lock tongue 2.

[0056] Although the utility model is disclosed as above, the protection scope of the utility model is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A positioning structure for an electric stretcher, used for being installed on a frame (10) of a stretcher, characterized in that: The invention comprises a base (1) and a locking tongue (2); the base (1) is mounted on the frame (10) and is provided with a first through hole (11); the first through hole (11) is used for a steering shaft (20) of a universal wheel to pass through so as to realize a rotational connection between the steering shaft (20) and the base (1); a limiting notch (30) is provided in the circumference of the steering shaft (20); the locking tongue (2) is rotationally connected to the base (1), and the rotation axis of the locking tongue (2) is arranged perpendicular to the axis of the steering shaft (20); the locking tongue (2) is used to engage with the limiting notch (30).

2. The electric stretcher positioning structure according to claim 1, characterized in that: It also comprises a driving assembly, wherein the driving assembly is used to drive the locking tongue (2) to rotate so as to enable the locking tongue (2) to engage with or release the engagement with the limiting notch (30).

3. The electric stretcher positioning structure according to claim 2, characterized in that: The driving assembly comprises an elastic telescopic rod, a locking shaft (5) and a pedal (6); the locking shaft (5) is rotatably connected to the base (1) around its own axis; the pedal (6) is mounted on the locking shaft (5) and is used to drive the locking shaft (5) to rotate; the elastic telescopic rod is mounted on the end surface of the locking shaft (5), and the central axis of the elastic telescopic rod is parallel to the axis of the locking shaft (5) and is not on a straight line; the elastic telescopic rod is telescopic relative to the locking shaft (5) to drive the locking tongue (2) to rotate.

4. The electric stretcher positioning structure according to claim 3, characterized in that: The base (1) is provided with a second through hole, and one end of the lock shaft (5) passes through the second through hole and is arranged toward the lock tongue (2), so that the elastic telescopic rod abuts against the lock tongue (2); when the elastic telescopic rod abuts against the rotation axis of the lock tongue (2), the elastic telescopic rod is in a compressed state; When the elastic telescopic rod rotates with the lock shaft (5) to gradually move away from the rotation axis of the lock tongue (2), the elastic telescopic rod releases elastic potential energy to drive the lock tongue (2) to rotate around its rotation axis.

5. The electric stretcher positioning structure according to claim 4, characterized in that: The rotation axis of the lock tongue (2) is located in the middle of the lock tongue (2), and the side of the lock tongue (2) facing the lock shaft (5) is arranged as an arc surface structure (21).

6. The electric stretcher positioning structure according to claim 3, characterized in that: The end surface of the lock shaft (5) is provided with a mounting groove (52), and the elastic telescopic rod is mounted in the mounting groove (52).

7. The electric stretcher positioning structure according to claim 6, characterized in that: The elastic telescopic rod comprises a lock core (4) and a spring (7) with one end sleeved on the lock core (4), and the other end of the spring (7) is installed in the installation groove (52).

8. The electric stretcher positioning structure according to claim 5, characterized in that: A spherical structure (41) is provided at one end of the elastic telescopic rod facing the arc-shaped surface structure (21), and the elastic telescopic rod is in sliding contact with the arc-shaped surface structure (21) via the spherical structure (41).

9. An electric stretcher, characterized in that: It comprises the electric stretcher positioning structure as described in any one of claims 1-8.

10. The electric stretcher according to claim 9, characterized in that: Two electric stretcher trolley positioning structures are provided, and the two electric stretcher trolley positioning structures are connected via the same locking shaft (5).

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