Multi-screen mounting bracket for computer teaching

Abstract

The utility model relates to the technical field of auxiliary tools for computer teaching, in particular to a multi-screen mounting bracket for computer teaching, which comprises a base, a support leg extension component for improving the support stability of the base is arranged on the base, and a vertical column component is fixedly mounted in the middle of the top end of the base. The left side and the right side of the middle and the left side and the right side of the upper portion of the stand column assembly are each provided with four displayer installation assemblies, and the two displayer installation assemblies on the upper portion and the two displayer installation assemblies on the middle portion can synchronously rotate in the opposite directions. The screen sides of the two displays mounted on the two groups of display mounting components at the upper part are aligned and clung to the screen sides of the two displays mounted on the two groups of display mounting components at the middle part; the utility model provides the multi-screen mounting bracket for computer teaching, which has good stability and can prevent dust from falling on the display screen when the multi-screen display is not used.

Description

TECHNICAL FIELD

[0001] The utility model relates to computer teaching auxiliary tool technical field especially, relate to a computer teaching is with many screen installation support. BACKGROUND

[0002] With the development of network technology, computer teaching gradually begins to popularize, and the college and university will basically set up computer major, and these majors send a large number of talents for software development industry, and in the actual work of software development, multiple screen display is often used to expand the display capacity of computer, so that the user can work on multiple screens simultaneously, therefore, many colleges and universities will use multiple screen display to carry out teaching in computer teaching, so that students can quickly adapt to the actual software development work after graduation, and the support for installing multiple screen display is an important component for computer multiple screen teaching.

[0003] The existing multiple screen display mounting support for computer multiple screen teaching is directly placed on the platform surface, and the stability is poor, and at the same time, when not carrying out computer teaching, the display screen on the multiple screen display is easy to fall dust, thereby affecting the use of next computer teaching. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a computer teaching is with many screen installation support to solve the technical problem existing in the above background art.

[0005] To achieve the above object, the technical scheme of the utility model is as follows:

[0006] A computer teaching is with many screen installation support, including: base, the base is provided with the support foot extension assembly for improving its support stability, the middle part of the top of the base is fixedly installed with the stand assembly, the middle part and the upper part of the stand assembly are provided with four groups of display mounting assemblies on the left and right sides respectively, the two groups of display mounting assemblies on the upper part and the two groups of display mounting assemblies on the middle part can be synchronously rotated towards each other, so that the screen side of two displays installed on the two groups of display mounting assemblies on the upper part is aligned and closely attached to the screen side of two displays installed on the two groups of display mounting assemblies on the middle part.

[0007] Further, the support foot extension assembly includes: extension support foot, screw No. 1 and tightening knob No. 1, the base is circular, a plurality of H-shaped sliding grooves are symmetrically formed on the left and right sides of the bottom end of the base, the plurality of H-shaped sliding grooves on the left and right sides are distributed along the radial direction of the base, the bottom end of the H-shaped sliding groove is flush with the bottom end of the base, the extension support foot is H-shaped and provided with a plurality of, the plurality of extension support feet are correspondingly arranged with the plurality of H-shaped sliding grooves on the left and right sides, and the extension support foot can slide and extend to the outside of the base along the corresponding H-shaped sliding groove.

[0008] Further, the length of the extension leg is the same as the length of the I-shaped sliding groove.

[0009] Further, the base top end left and right sides are symmetrically provided with a plurality of strip-shaped sliding holes one, and the left and right sides of the plurality of strip-shaped sliding holes one are in one-to-one correspondence with the left and right sides of the plurality of I-shaped sliding grooves one, and the top end of the plurality of extension legs close to the base center one side is respectively fixedly connected with a plurality of screw rods one, and the plurality of screw rods one respectively slide or movably penetrate through the plurality of strip-shaped sliding holes one on the left and right sides from bottom to top and are threadedly connected with a plurality of tightening knobs one at the top end of the plurality of strip-shaped sliding holes one on the left and right sides, and the bottom end surface of the tightening knob one can be in close contact with the top end surface of the base.

[0010] Further, the strip-shaped sliding hole one is symmetrically provided with six, wherein the strip-shaped sliding hole one in the middle of the left side is aligned with the horizontal axis of the base, and the two strip-shaped sliding holes one in the front and rear of the left side are arranged at an angle of °~° with the strip-shaped sliding hole one in the middle of the left side.

[0011] Further, the column assembly comprises: a column one, a column two, a column three, a column four, a column five and a support shaft, the support shaft is provided with eight, the column one, the column two, the column three, the column four and the column five are sequentially arranged from bottom to top, and the column one and the column two, the column two and the column three, the column three and the column four, and the column four and the column five are fixedly connected through two left and right symmetrically arranged support shafts.

[0012] Further, the display mounting assembly comprises: a sleeve one, a gear ring and a cross arm, the sleeve one is sleeved and rotationally connected on the corresponding support shaft between the column two and the column three or between the column three and the column four, the outer wall of the two sleeve ones at the same height is provided with a gear ring, the two gear rings are meshed with each other, and the lateral end of the sleeve one is transversely fixedly connected with a cross arm, the cross arm is provided with a sliding seat capable of transversely adjusting the position, and the front end of the sliding seat is detachably fixedly installed with a display mounting seat capable of finely adjusting the direction of the display.

[0013] Further, the sliding seat comprises: a sliding block, a fixed seat, a screw rod two and a tightening knob two, a strip-shaped sliding hole two is formed in the lateral end of the cross arm, the sliding block is transversely slidably connected in the strip-shaped sliding hole two, the front end of the sliding block is fixedly connected with the fixed seat, the width of the fixed seat is greater than the width of the strip-shaped sliding hole two, the thickness of the sliding block is less than the hole depth of the strip-shaped sliding hole two, the rear end of the sliding block is fixedly connected with the screw rod two, the screw rod two slidably or movably penetrates through the strip-shaped sliding hole two and is threadedly connected with the tightening knob two at the rear end of the strip-shaped sliding hole two, and the front end surface of the tightening knob two can be in close contact with the rear end surface of the cross arm.

[0014] Further, the display mounting seat comprises bolts one, a movable seat, a hinged ball, a connecting rod and a display mounting plate, the bolts one are provided with several, the movable seat is fixedly installed at the front end of the fixed seat through the several bolts one, a ball groove one is formed in the middle of the front end of the fixed seat, a ball groove two is formed in the middle of the rear end of the movable seat, a taper hole is formed in the front end of the movable seat and communicated with the ball groove two, the hinged ball is matched with the ball groove one and the ball groove two and hinged between the ball groove one and the ball groove two, the connecting rod is fixedly connected with the hinged ball on the radial one side, the diameter of the connecting rod is smaller than the minimum diameter of the taper hole, the connecting rod is movably penetrated through the taper hole from back to front, and the display mounting plate is fixedly connected with the front end of the connecting rod.

[0015] Further, it further comprises sleeve two, bolt two and reinforcing plate, the sleeve two and the reinforcing plate are provided with four, the bolt two is provided with several, four sleeve two are respectively sleeved on four supporting shafts between the stand column one and the stand column two and between the stand column four and the stand column five, one end of four reinforcing plates is respectively fixedly connected on four sleeve two through several bolt two, the other end of two reinforcing plates in the middle of four reinforcing plates is respectively fixedly connected on the middle part of the bottom end of two horizontal arms arranged symmetrically on the left and right through several bolt two, and the other end of two reinforcing plates in the upper part of four reinforcing plates is respectively fixedly connected on the middle part of the top end of two horizontal arms arranged symmetrically on the left and right through several bolt two.

[0016] Compared with the prior art, the display mounting seat has the following beneficial effects:

[0017] The foot extension assembly is arranged, the screw rod one and the extension foot are respectively slid radially outward by tightening the knob one, the stability of the whole device is improved by increasing the supporting radius of the base, and it is ensured that the whole device can stand stably on the computer teaching platform after four displays are installed; when teaching is not performed or the multi-screen display is not needed for teaching, only the two displays arranged oppositely on the left and right need to be synchronously rotated towards each other through two groups of corresponding display mounting assemblies, and the screens of the two oppositely arranged displays are aligned and closely attached on the side, so that dust on the display screen is avoided, and the next use is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 is a structural schematic view of the utility model;

[0019] Fig. 2 is a horizontal longitudinal sectional view of the utility model;

[0020] Fig. 3 is a rear side bottom view of the utility model;

[0021] Fig. 4 is a horizontal sectional view of the utility model at the hinged ball;

[0022] Fig. 5 is a sectional view of the bolt of the utility model.

[0023] The reference signs in the drawings are: 1-base, 101-bar-shaped sliding hole one, 2-extended support leg, 3-screw rod one, 4-tightening knob one, 5-stand one, 6-stand two, 7-stand three, 8-stand four, 9-stand five, 10-support shaft, 11-sleeve one, 12-tooth ring, 13-cross arm, 1301-bar-shaped sliding hole two, 14-sliding block, 15-fixed seat, 16-screw rod two, 17-tightening knob two, 18-bolt one, 19-movable seat, 20-hinge ball, 21-connecting rod, 22-display mounting plate, 23-sleeve two, 24-bolt two, 25-stiffening plate. DETAILED DESCRIPTION

[0024] The utility model will be further explained in detail in combination with the drawings and examples.

[0025] Referring to Figs. 1-5 As shown in the figure, a kind of multi-screen installation support for computer teaching, it include: base 1, the support leg extension assembly for improving its support stability is provided on base 1, the stand assembly is fixedly installed in the middle of the top of base 1, the left and right sides of the middle and upper portion of stand assembly are provided with four groups of display mounting assembly, the screen side of two displays installed on the two groups of display mounting assembly of upper portion and the screen side of two displays installed on the two groups of display mounting assembly of middle portion can be synchronously rotated towards each other, so that the screen side of two displays installed on the two groups of display mounting assembly of upper portion and the screen side of two displays installed on the two groups of display mounting assembly of middle portion are aligned closely.

[0026] In the embodiment, the foot extension assembly comprises: extension feet 2, screw rods 3 and tightening knobs 4, the base 1 is circular, a plurality of I-shaped sliding grooves are symmetrically formed on the left and right sides of the bottom end of the base 1, the plurality of I-shaped sliding grooves on the left and right sides are distributed along the radial direction of the base 1, the bottom end of the I-shaped sliding groove is flush with the bottom end of the base 1, the extension feet 2 are I-shaped and a plurality of extension feet 2 are provided, the plurality of extension feet 2 are provided in one-to-one correspondence with the plurality of I-shaped sliding grooves on the left and right sides, the extension feet 2 can slide radially along the corresponding I-shaped sliding groove and extend to the outside of the base 1; the length of the extension feet 2 is the same as the length of the I-shaped sliding groove; a plurality of strip-shaped sliding holes 101 are symmetrically formed on the left and right sides of the top end of the base 1, the plurality of strip-shaped sliding holes 101 on the left and right sides are in one-to-one correspondence with the plurality of I-shaped sliding grooves on the left and right sides, the top end of the side close to the center of the base 1 of each of the plurality of extension feet 2 is fixedly connected with a screw rod 3, the plurality of screw rods 3 are slidably or movably inserted through the plurality of strip-shaped sliding holes 101 on the left and right sides from bottom to top and are threadedly connected with a plurality of tightening knobs 4 at the top end of the plurality of strip-shaped sliding holes 101 on the left and right sides, the bottom end surface of the tightening knob 4 can be in close contact with the top end surface of the base 1, the strip-shaped sliding holes 101 are symmetrically provided with six strip-shaped sliding holes 101, wherein the strip-shaped sliding hole 101 in the middle of the left side is aligned with the horizontal axis of the base 1, the two strip-shaped sliding holes 101 in the front and rear of the left side are arranged at an angle of 30°-45° with the strip-shaped sliding hole 101 in the middle of the left side; when it is necessary to improve the stability of the entire device; only six tightening knobs 4 are loosened, then the screw rods 3 and the extension feet 2 are driven by the tightening knobs 4 to slide radially outward, so that the extension feet 2 are moved to the appropriate position, and then the six tightening knobs 4 are tightened, at this time, the support radius of the base 1 is expanded, thereby the entire device has good stability.

[0027] In the embodiment, the column assembly comprises: a column one 5, a column two 6, a column three 7, a column four 8, a column five 9 and a support shaft 10, the support shaft 10 is provided with eight, the column one 5, the column two 6, the column three 7, the column four 8 and the column five 9 are sequentially arranged from bottom to top, and the column one 5 and the column two 6, the column two 6 and the column three 7, the column three 7 and the column four 8, and the column four 8 and the column five 9 are fixedly connected by two left and right symmetrically arranged support shafts 10.

[0028] The display mounting assembly comprises sleeve one 11, gear ring 12 and cross arm 13, sleeve one 11 is sleeved and rotationally connected on the corresponding support shaft 10 between stand two 6 and stand three 7 or between stand three 7 and stand four 8, the outer walls of the two sleeve ones 1 at the same height are provided with gear rings 12, the two gear rings 12 are engaged with each other, the outer side end of the sleeve one 1 is transversely fixedly connected with the cross arm 13, the cross arm 13 is provided with a sliding seat capable of transversely adjusting the position, and the front end of the sliding seat is detachably fixedly provided with a display mounting seat capable of finely adjusting the orientation of the display.

[0029] In the embodiment, the sliding seat comprises sliding block 14, fixed seat 15, screw rod two 16 and tightening knob two 17, the outer side of the front end of the cross arm 13 is provided with transversely arranged strip-shaped sliding hole two 1301, the sliding block 14 is transversely and slidably connected in the strip-shaped sliding hole two 1301, the front end of the sliding block 14 is fixedly connected with the fixed seat 15, the width of the fixed seat 15 is greater than the width of the strip-shaped sliding hole two 1301, the thickness of the sliding block 14 is less than the hole depth of the strip-shaped sliding hole two 1301, the rear end of the sliding block 14 is fixedly connected with the screw rod two 16, the screw rod two 16 is slidably or movably penetrated through the strip-shaped sliding hole two 1301 and is threadedly connected with the tightening knob two 17 at the rear end of the strip-shaped sliding hole two 1301, and the front end surface of the tightening knob two 17 can be pressed and contacted with the rear end surface of the cross arm 13, when the transverse position of the display mounting seat needs to be adjusted, the tightening knob two 17 is only loosened, the sliding block 14 is slid transversely along the strip-shaped sliding hole two 1301 to the appropriate position, and then the tightening knob two 17 is tightened.

[0030] In the embodiment, the display mounting seat comprises screw one 18, movable seat 19, hinged ball 20, connecting rod 21 and display mounting plate 22, the movable seat 19 is fixedly installed at the front end of the fixed seat 15 through the plurality of screw one 18, the front end of the fixed seat 15 is provided with ball groove one, the rear end of the movable seat 19 is provided with ball groove two, the front end of the movable seat 19 is provided with taper hole which is communicated with the ball groove two, the hinged ball 20 is matched with the ball groove one and the ball groove two and is hinged between the ball groove one and the ball groove two, the connecting rod 21 is fixedly connected with the hinged ball 20 on one side in the radial direction, the diameter of the connecting rod 21 is less than the minimum diameter of the taper hole, the connecting rod 21 is movably penetrated through the taper hole from the rear to the front, the front end of the connecting rod 21 is located in front of the taper hole and is fixedly connected with the display mounting plate 22, when the orientation of the display needs to be finely adjusted, the display is only pulled with force to overcome the frictional force between the hinged ball 20 and the ball groove one and the ball groove two, and the display is finely adjusted to the appropriate direction.

[0031] In the embodiment, the multi-screen mounting support for computer teaching further comprises: four sleeve no. 2 23, several bolt no. 2 24 and four reinforcing plates 25, the sleeve no. 2 23 and the reinforcing plates 25 are provided with four, the bolt no. 2 24 is provided with several, the four sleeve no. 2 23 are respectively sleeved on the four support shafts 10 between the stand no. 1 5 and the stand no. 2 6 and between the stand no. 4 8 and the stand no. 5 9, one end of the four reinforcing plates 25 is respectively fixedly connected on the four sleeve no. 2 23 through several bolt no. 2 24, the other end of the two reinforcing plates 25 in the middle lower part of the four reinforcing plates 25 is respectively fixedly connected on the bottom end middle part of the two horizontal arms 13 symmetrically arranged on the left and right through several bolt no. 2 24, the other end of the two reinforcing plates 25 in the upper part of the four reinforcing plates 25 is respectively fixedly connected on the top end middle part of the two horizontal arms 13 symmetrically arranged on the left and right through several bolt no. 2 24, the reinforcing plate 25 in cooperation with the sleeve no. 2 23 can improve the bearing degree of the four horizontal arms 13.

[0032] When the device is used, four displays for computer teaching are first installed on the four display mounting plates 22, and when installing, the horizontal position of the display mounting seat is adjusted according to the size of the display; when adjusting, only the knob no. 2 17 is loosened, the sliding block 14 is slid horizontally along the strip-shaped sliding hole no. 2 1301 to the appropriate position, then the knob no. 2 17 is tightened, then the device with the installed display is placed on the teaching platform table top; then six tightening knobs no. 1 4 are loosened, then the extension legs 2 are radially outwardly slid by driving the screw rods no. 1 3 and the extension legs 2 through the tightening knobs no. 1 4 to move to the appropriate position, then the six tightening knobs no. 1 4 are tightened, at this time, the support radius of the base 1 is expanded, thereby the whole device has good stability; in the use process of the teacher, the display can be finely adjusted to the appropriate direction by pulling the display to overcome the friction between the hinged ball 20 and the ball groove no. 1 and the ball groove no. 2; when not teaching or not needing to use the multi-screen display for teaching, only the two displays oppositely arranged are synchronously rotated towards each other through the two groups of corresponding display mounting assemblies, and the screens of the two oppositely arranged displays are aligned and closely attached on the side, thereby avoiding dust falling on the display and avoiding affecting the next use.

[0033] In the description of the present application, it should be explained that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation of the present application.

[0034] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Any modification, equivalent replacement, and improvement of the above embodiments made by any person skilled in the art, without departing from the technical scope of the present application, shall fall within the protection scope of the present application.

Claims

1. A multi-screen installation support for computer education, characterized by, Include: Base (1), the base (1) is provided with a foot extension assembly for improving its support stability, the middle of the top end of the base (1) is fixedly installed with a column assembly, the left and right sides of the middle and upper part of the column assembly are respectively provided with four groups of display mounting assemblies, the two display mounting assemblies of the upper part and the two display mounting assemblies of the middle part can be synchronously rotated towards each other, so that the screen side of the two displays installed on the two display mounting assemblies of the upper part and the screen side of the two displays installed on the two display mounting assemblies of the middle part are aligned and close.

2. The multi-screen mounting support for computer-assisted instruction of claim 1, wherein: The foot extension assembly comprises: an extension foot (2), a screw rod (3) and a tightening knob (4), the base (1) is circular, a plurality of I-shaped sliding grooves are symmetrically formed on the left and right sides of the bottom end of the base (1), the plurality of I-shaped sliding grooves on the left and right sides are distributed along the radial direction of the base (1), the bottom end of the I-shaped sliding groove is flush with the bottom end of the base (1), the extension foot (2) is I-shaped and provided with a plurality of extension feet (2), the plurality of extension feet (2) are correspondingly arranged with the plurality of I-shaped sliding grooves on the left and right sides, and the extension foot (2) can slide and extend to the outside of the base (1) along the corresponding I-shaped sliding groove.

3. The multi-screen mounting support for computer-assisted instruction of claim 2, wherein: The length of the extension foot (2) is the same as the length of the I-shaped sliding groove.

4. The multi-screen mounting support for computer-assisted instruction of claim 3, wherein: A plurality of strip-shaped sliding holes (101) are symmetrically formed on the left and right sides of the top end of the base (1), the plurality of strip-shaped sliding holes (101) on the left and right sides are communicated with the plurality of I-shaped sliding grooves on the left and right sides one by one, and the top end of the side close to the center of the base (1) of the plurality of extension feet (2) is fixedly connected with a plurality of screw rods (3), the plurality of screw rods (3) are respectively slid or movably penetrated through the plurality of strip-shaped sliding holes (101) on the left and right sides from bottom to top and are threadedly connected with a plurality of tightening knobs (4) at the top of the plurality of strip-shaped sliding holes (101) on the left and right sides, and the bottom end surface of the tightening knob (4) can be in close contact with the top end surface of the base (1).

5. The multi-screen mounting support for computer instruction of claim 4, wherein: The strip-shaped sliding holes (101) are symmetrically formed on the left and right sides, and six strip-shaped sliding holes (101) are symmetrically formed on the left and right sides, wherein the strip-shaped sliding hole (101) on the left side is aligned with the horizontal axis of the base (1), and the two strip-shaped sliding holes (101) on the left side are arranged at an angle of 30°-45° with the strip-shaped sliding hole (101) on the left side.

6. The multi-screen mounting support for computer instruction of claim 1, wherein: The column assembly comprises: a column (5), a column (6), a column (7), a column (8), a column (9) and a support shaft (10), the support shaft (10) is provided with eight, the column (5), the column (6), the column (7), the column (8) and the column (9) are sequentially arranged from bottom to top, and the column (5) and the column (6), the column (6) and the column (7), the column (7) and the column (8), and the column (8) and the column (9) are fixedly connected by two left and right symmetric support shafts (10).

7. The multi-screen mounting support for computer instruction of claim 6, wherein: The display mounting assembly comprises sleeve one (11), gear ring (12) and cross arm (13), the sleeve one (11) is sleeved and rotationally connected on the corresponding support shaft (10) between the stand two (6) and the stand three (7) or the stand three (7) and the stand four (8), the outer walls of the two sleeve one (11) at the same height are provided with gear rings (12), the two gear rings (12) are engaged with each other, the lateral end of the sleeve one (11) is transversely fixedly connected with the cross arm (13), the cross arm (13) is provided with a sliding seat capable of transversely adjusting the position, and the front end of the sliding seat is detachably fixedly provided with a display mounting seat capable of finely adjusting the orientation of the display.

8. The multi-screen mounting support for computer instruction of claim 7, wherein: The sliding seat comprises sliding block (14), fixed seat (15), screw two (16) and tightening knob two (17), the lateral end of the cross arm (13) is provided with a transversely arranged strip-shaped sliding hole two (1301), the sliding block (14) is transversely and slidably connected in the strip-shaped sliding hole two (1301), the front end of the sliding block (14) is fixedly connected with the fixed seat (15), the width of the fixed seat (15) is greater than the width of the strip-shaped sliding hole two (1301), the thickness of the sliding block (14) is less than the hole depth of the strip-shaped sliding hole two (1301), the rear end of the sliding block (14) is fixedly connected with the screw two (16), the screw two (16) is slidably or movably penetrated through the strip-shaped sliding hole two (1301) and is screwed at the rear end of the strip-shaped sliding hole two (1301) and is screwed with the tightening knob two (17), and the front end surface of the tightening knob two (17) can be pressed and contacted with the rear end surface of the cross arm (13).

9. The multi-screen mounting support for computer instruction of claim 8, wherein: The display mounting seat comprises screw one (18), movable seat (19), hinged ball (20), connecting rod (21) and display mounting plate (22), the screw one (18) is provided with a plurality of, the movable seat (19) is fixedly installed at the front end of the fixed seat (15) through the plurality of screw one (18), the fixed seat (15) is provided with a ball groove one in the middle of the front end, the movable seat (19) is provided with a ball groove two in the middle of the rear end, the movable seat (19) is provided with a taper hole in communication with the ball groove two in the front end, the hinged ball (20) is matched with the ball groove one and the ball groove two and is hinged between the ball groove one and the ball groove two, the connecting rod (21) is fixedly connected with the hinged ball (20) on one side in the radial direction, the diameter of the connecting rod (21) is less than the minimum diameter of the taper hole, the connecting rod (21) is movably penetrated through the taper hole from back to front, and the front end of the connecting rod (21) is located in front of the taper hole and is fixedly connected with the display mounting plate (22).

10. The multi-screen mounting support for computer instruction of claim 6, wherein: Also comprising: The sleeve two (23), bolt two (24) and reinforcing plate (25) are provided with four, the sleeve two (23) and reinforcing plate (25), several bolt two (24) are provided with four, four sleeve two (23) are respectively set on four support shafts (10) between column one (5) and column two (6) and between column four (8) and column five (9), one end of four reinforcing plates (25) is respectively fixedly connected on four sleeve two (23) through several bolt two (24), the other end of two reinforcing plates (25) in the middle and lower parts of four reinforcing plates (25) is respectively fixedly connected on the bottom end of the middle part of two horizontal arms (13) arranged symmetrically left and right, the other end of two reinforcing plates (25) in the upper part of four reinforcing plates (25) is respectively fixedly connected on the top end of the middle part of two horizontal arms (13) arranged symmetrically left and right.

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