A direct connection structure of a balancing arm, an arm frame and an upper support and an installation method thereof

Abstract

A direct connection structure of a balance arm, a boom and an upper support, comprising an upper support arranged horizontally, a balance arm and a boom are respectively arranged on both sides of the upper support in the horizontal direction, a double-ear plate of an upper chord of the balance arm and a single-ear plate of an upper chord of the boom are connected by a pin shaft; a lower chord of the balance arm is connected to the upper support, and a lower chord of the boom is connected to the upper support; the balance arm and the boom extend in opposite directions along the same straight line; and a mounting frame for assisting the installation of the balance arm is also included, the mounting frame is obliquely connected between the balance arm and one end of the upper support close to the boom. The present invention also provides an installation method of a direct connection structure of a balance arm, a boom and an upper support, during installation, the direct connection between the balance arm, the boom and the upper support can be completed by simply connecting the mounting frame installed on the balance arm to the upper support, the structure is simple, the installation is convenient, and the height of the rotating tower body is reduced at the same time, thereby effectively reducing the height of the installed tower crane, and the force of the rotating upper structure is more reasonable.

Description

Technical Field

[0001] The invention relates to the technical field of tower cranes, and in particular to a direct connection structure of a balance arm, a boom and an upper support and an installation method thereof. Background Art

[0002] At present, most of the tower crane balance arm and boom (the tower crane's lifting arm is referred to as the boom or jib) are connected by the following methods: Figure 1 The rotating tower shown in the figure or through Figure 2 The connection device shown in the figure is used to complete the operation, that is, a single ear plate is provided for the balance arm, a single ear plate is provided for the boom, and a double ear plate is provided for the revolving tower body. The balance arm and the revolving tower body are connected by a pin shaft, and the boom and the other side of the revolving tower body are also connected by a pin shaft, or a double ear plate is provided for the balance arm, a double ear plate is provided for the boom, and a single ear plate is provided for the revolving tower body, so that the revolving tower body is connected to the balance arm and the boom respectively by a pin shaft, and the lower part of the revolving tower body is connected to the upper support of the tower crane by a pin shaft. No matter how these parts are arranged, problems such as uneven gap distribution and low installation efficiency often occur. Due to the existence of the revolving tower body, the revolving upper structure is heightened and is affected by pressure, shear, torsion, bending and other forces, and its overall force effect is not ideal.

[0003] The connecting device is actually a conversion joint, which only lowers the height of the rotating tower. It sets a single or double connecting plate through the balance arm and boom structure, so that the left and right sides are connected to the balance arm and boom respectively. The lower part of the connecting device is directly connected to the upper support, which is complicated to manufacture and install, and it also increases the workload invisibly. Summary of the invention

[0004] To overcome the above problems, a first aspect of the present invention provides a direct connection structure of a balancing arm, an arm frame and an upper support, and a second aspect of the present invention provides an installation method of the direct connection structure of a balancing arm, an arm frame and an upper support.

[0005] The technical solution adopted by the present invention is: a direct connection structure of a balancing arm, a boom and an upper support, comprising a horizontally arranged upper support, wherein a balancing arm and a boom are respectively arranged on the left and right sides of the upper support in the horizontal direction, and the balancing arm and the boom extend in opposite directions along the same straight line; the balancing arm comprises a balancing arm upper chord rod and two balancing arm lower chord rods, and the boom comprises an boom upper chord rod and two boom lower chord rods, and the cross-sections of the balancing arm and the boom are both triangular cross-sections;

[0006] A double-ear plate is provided at one end of the upper chord of the balance arm close to the upper support, and a single-ear plate is provided at one end of the upper chord of the arm frame close to the upper support. Connecting holes are concentrically provided on the single-ear plate and the double-ear plate. The double-ear plate of the upper chord of the balance arm is connected to the single-ear plate of the upper chord of the arm frame through a pin shaft.

[0007] A first connecting group is provided at one end of the lower chord of the balance arm close to the upper support, and a pair of first fixing plates are provided on the upper support corresponding to the position of the first connecting group, and the pair of first fixing plates are symmetrically arranged on the front and rear sides of the first connecting group; the first connecting group includes a first round steel and a first round steel mounting seat, and the first round steel mounting seat is provided with a first mounting hole, and the first round steel is inserted into the first mounting hole and the protruding lengths at both ends are the same; one end of the first fixing plate is fixedly connected to the upper support, and the other end is provided with a latch hole, a hinge hole, a fixing hole and an open curved groove; a latch hole for preventing the gusset frame from closing is provided above the open curved groove, a hinge hole for hinged connection with the first hole on the gusset frame is provided obliquely above, and a fixing hole for fixing the gusset frame is provided below; the protruding end of the first round steel is arranged in the open curved groove, and the gusset frame is hingedly connected to the outer side of the first fixing plate;

[0008] The gusset frame includes a gusset plate, which is a roughly U-shaped plate-like structure. The gusset plate is provided with a first hole at a position corresponding to the hinge hole, a round plate is provided on the side of the first hole close to the first fixed plate, and a second hole is provided at a position corresponding to the fixed hole. The gusset plate is also provided with an insertion tube for inserting a latch and a handle for convenient closing or opening of the gusset frame; when the gusset frame is buckled, the groove of the gusset plate and the open curved groove form a storage space for accommodating the first round steel, and the second hole is connected to the fixed hole through a pin shaft; the latch is fixedly connected to the handle through a chain, and when the gusset frame is buckled, the latch is inserted into the insertion tube, and when the gusset frame is opened, the latch is inserted into the latch hole to prevent the gusset frame from closing;

[0009] A second connection group is provided at one end of the lower chord of the arm near the upper support, and a pair of second fixing plates are provided at a position of the upper support corresponding to the second connection group, and the pair of second fixing plates are symmetrically arranged at the front and rear sides of the second connection group; the second connection group includes a second round steel and a second round steel mounting seat, and the second round steel mounting seat is provided with a second mounting hole, and the second round steel is penetrated in the second mounting hole and the two ends extend out to the same length; the structure of the second fixing plate is a mirror image of the structure of the first fixing plate; the connection method of the second connection group and the second fixing plate is consistent with the connection method of the first connection group and the first fixing plate;

[0010] It also includes a mounting frame for assisting the installation of the balance arm, a pair of connecting plates are provided on one side of the lower end of the double-ear plate close to the upper support, the pair of connecting plates are symmetrically arranged on the front and rear sides of the top of the mounting frame, and the connecting plates are provided with long slot holes for fixed connection with the mounting frame and pin shaft holes for acting as a gear frame in sequence from top to bottom; the mounting frame includes a rectangular frame that is at a certain angle to the horizontal plane, and the rectangular frame is composed of two inclined vertical pipes and two horizontally arranged horizontal pipes; an upper connecting head for fixed connection with the connecting plate is provided above the rectangular frame, the upper connecting head and the rectangular frame are in the same plane, and the upper connecting head is fixedly connected to the rectangular frame through two supporting pipes; the upper connecting head is rod-shaped, and first through holes are opened at both ends of the upper connecting head, and the first through holes are connected to the long slot holes on the connecting plate through pin shafts;

[0011] A long pad is provided at the top of the vertical tube, and a handrail for easy installation is provided in the middle section of the vertical tube; a short pad is provided at the bottom end of the vertical tube, and a lower connecting head for fixed connection with the upper support is provided at the bottom end of the short pad; a base for fixed connection with the lower connecting head is provided at one end of the upper support close to the armrest; a second through hole is provided on the lower connecting head, and a circular hole is provided on the base, and the second through hole is connected to the circular hole on the base through a pin shaft.

[0012] A method for installing a direct connection structure of a balancing arm, an arm frame and an upper support comprises the following steps:

[0013] Step 1, use a pin to install the mounting frame to the long slotted hole in the connecting plates of the two balancing arm upper chords, and then insert the pin into the pin hole on the connecting plate so that the mounting frame is supported on the outside of the pin to keep it in its position;

[0014] Step 2, using screw pins to install the gusset frame to the hinge holes of the first fixing plate and the second fixing plate of the upper support respectively, and then inserting the latch pins into the latch pin holes of the first fixing plate and the second fixing plate respectively, so that the gusset frame is in an open state and is arranged in pairs;

[0015] Step 3, lift the balancing arm with auxiliary equipment, make the first connection group on the balancing arm lean against the first fixing plate on the upper support, pull out the latch, fix the latch into the insert on the gusset frame, close the gusset frame, and then fix the gusset frame with the screw shaft;

[0016] Step 4, rotating the balancing arm through the first round steel on the first connection group, so that the mounting frame is close to the base on the upper support, and fixed, so that the balancing arm is fixed on the upper support;

[0017] Step 5, hoist the boom with auxiliary equipment so that the second connection group on the boom is within the range of the second fixed plate of the upper support, and connect the single ear plate of the boom and the double ear plate of the balance arm with a pin shaft;

[0018] Step 6, slowly descend, when the second connection group on the arm is close to the second fixed plate of the upper support, pull out the pin, fix the pin into the insert on the pinch plate frame, close the pinch plate frame, and then fix the pinch plate frame with the screw shaft.

[0019] Furthermore, in the step 1, the mounting frame can be installed in advance in the connecting plate of the upper chord of the balance arm, and then the pin is inserted into the pin hole on the connecting plate, so that the mounting frame is supported on the inner side of the pin to keep it in its position; before installing the balance arm, it is only necessary to remove the pin on the pin hole, pull the mounting frame outward, and when it exceeds the pin hole, remove the pin into the pin hole, so that the mounting frame is supported on the outer side of the pin to keep it in its position.

[0020] Furthermore, in step 6, since the arm's own weight will pull the balance arm to rotate through the first round steel of the balance arm's lower chord, the mounting frame will move in the direction of the long slot hole of the connecting plate.

[0021] The beneficial effects of the present invention are as follows: the balancing arm and the upper chord of the boom are directly connected, and the lower chord part of the balancing arm and the lower chord part of the boom are connected to the upper support, eliminating the transition of the rotating tower body or the connecting device, and during installation, it is only necessary to connect the mounting frame installed on the balancing arm with the upper support to complete the direct connection between the balancing arm, the boom and the upper support. The structure is simple and the installation is convenient. At the same time, the height of the rotating tower body is reduced, thereby effectively reducing the height of the installed tower crane, and the force on the rotating upper structure is more reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of installing a balancing arm and a boom through a rotating tower body.

[0023] Figure 2 The utility model is a structural schematic diagram of installing a balancing arm and an arm frame through an existing connecting device.

[0024] Figure 3 It is a structural schematic diagram of the present invention.

[0025] Figure 4 It is the front view of the balance arm.

[0026] Figure 5 is a side view of the balance arm.

[0027] Figure 6 It is a structural schematic diagram of the first connection group on the lower chord of the balance arm.

[0028] Figure 7 It is the front view of the boom.

[0029] Figure 8 It is a side view of the boom.

[0030] Fig. 9 It is a structural schematic diagram of the second connection group on the lower chord of the boom.

[0031] Fig.10 It is a structural diagram of the upper support.

[0032] Fig.11 It is a structural diagram of the mounting frame.

[0033] Fig.12 It is a structural diagram of the gusset plate frame.

[0034] Fig.13 is a schematic diagram of the mounting frame assembled on the balance arm.

[0035] Fig.14It is a schematic diagram of the mounting bracket on the balance arm before lifting.

[0036] Fig.15 Schematic diagram of the gusset frame opened on the upper support.

[0037] Fig.16 It is a schematic diagram of the balance arm installed on the upper support.

[0038] Explanation of reference numerals: 1. balancing arm; 11. balancing arm upper chord; 12. double ear plate; 13. connecting plate; 14. balancing arm lower chord; 15. first connection group; 16. first round steel; 17. long slot hole; 18. pin hole; 2. arm frame; 21. arm frame upper chord; 22. arm frame lower chord; 23. single ear plate; 24. second connection group; 25. second round steel; 3. upper support; 31. base; 321. first fixed Plate; 322, second fixed plate; 33, latch hole; 34, hinge hole; 35, fixing hole; 4, mounting frame; 41, upper connector; 42, supporting tube; 43, long pad; 44, horizontal tube; 45, vertical tube; 46, short pad; 47, lower connector; 48, handrail; 5, buckle plate frame; 51, buckle plate; 52, round sticking plate; 53, insert tube; 54, handle; 55, first hole; 56, second hole; 6, latch. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Referring to the accompanying drawings, a direct connection structure of a balancing arm, a boom and an upper support includes a horizontally arranged upper support 3, a balancing arm 1 and a boom 2 are respectively arranged on the left and right sides of the upper support 3 in the horizontal direction, and the balancing arm 1 and the boom 2 extend in opposite directions along the same straight line; the balancing arm 1 includes a balancing arm upper chord rod 11 and two balancing arm lower chord rods 14, and the boom 2 includes an boom upper chord rod 21 and two boom lower chord rods 22, and the cross-sections of the balancing arm 1 and the boom 2 are both triangular cross-sections;

[0043] A double-ear plate 12 is provided at one end of the balancing arm upper chord rod 11 close to the upper support 3, and a single-ear plate 23 is provided at one end of the arm support upper chord rod 21 close to the upper support 3. Connecting holes are concentrically provided on the single-ear plate 23 and the double-ear plate 12. The double-ear plate 12 of the balancing arm upper chord rod 11 is connected to the single-ear plate 23 of the arm support upper chord rod 21 through a pin shaft.

[0044] A first connecting group 15 is provided at one end of the lower chord 14 of the balance arm close to the upper support 3, and a pair of first fixing plates 321 are provided on the upper support 3 corresponding to the position of the first connecting group 15, and the pair of first fixing plates 321 are symmetrically arranged on the front and rear sides of the first connecting group 15; the first connecting group 15 includes a first round steel 16 and a first round steel mounting seat, and the first round steel mounting seat is provided with a first mounting hole, and the first round steel 16 is inserted into the first mounting hole and the protruding lengths at both ends are the same; one end of the first fixing plate 321 is fixedly connected to the upper support 3, and the other end is provided with a latch hole 33, a hinge hole 34, a fixing hole 35 and an open curved groove; a latch hole 33 for preventing the buckle plate frame 5 from closing is provided above the open curved groove, a hinge hole 34 for hinged connection with the first hole 55 on the buckle plate frame 5 is provided obliquely above, and a fixing hole 35 for fixing the buckle plate frame 5 is provided below; the protruding end of the first round steel 16 is arranged in the open curved groove, and the buckle plate frame 5 is hingedly connected to the outer side of the first fixing plate 321;

[0045] The gusset frame 5 includes a gusset plate 51, which is a roughly U-shaped plate structure. The gusset plate 51 is provided with a first hole 55 at a position corresponding to the hinge hole 34, and a round plate 52 is provided on the side of the first hole 55 close to the first fixing plate 321. The gusset plate 51 is provided with a second hole 56 at a position corresponding to the fixing hole 35. The gusset plate 51 is also provided with a plug 53 for inserting the latch 6, and a handle 54 for convenient closing or opening of the gusset frame 5; when the gusset frame 5 is buckled, the groove of the gusset plate 51 and the open curved groove form a accommodating space for accommodating the first round steel 16, and the second hole 56 is connected to the fixing hole 35 by a pin shaft; the latch 6 is fixedly connected to the handle 54 by a chain, and when the gusset frame 5 is buckled, the latch 6 is inserted in the plug 53, and when the gusset frame 5 is opened, the latch 6 is inserted in the latch hole 33 to prevent the gusset frame 5 from closing;

[0046] A second connection group 24 is provided at one end of the lower chord 22 of the arm near the upper support 3, and a pair of second fixing plates 322 are provided at a position of the upper support 3 corresponding to the second connection group 24, and the pair of second fixing plates 322 are symmetrically arranged at the front and rear sides of the second connection group 24; the second connection group 24 includes a second round steel 25 and a second round steel mounting seat, and the second round steel mounting seat is provided with a second mounting hole, and the second round steel 25 is penetrated in the second mounting hole and the two ends extend out to the same length; the structure of the second fixing plate 322 is a mirror image of the structure of the first fixing plate 321; the connection method of the second connection group 24 and the second fixing plate 322 is consistent with the connection method of the first connection group 15 and the first fixing plate 321;

[0047] It also includes a mounting frame 4 for assisting the installation of the balancing arm 1, a pair of connecting plates 13 are provided on one side of the lower end of the double-ear plate 12 close to the upper support 3, and the pair of connecting plates 13 are symmetrically arranged on the front and rear sides of the top of the mounting frame 4, and the connecting plates 13 are provided with long slot holes 17 for fixed connection with the mounting frame 4 and pin holes 18 for acting as a gear frame from top to bottom; the mounting frame 4 includes a rectangular frame with a certain angle to the horizontal plane, and the rectangular frame is composed of two inclined vertical pipes 45 and two horizontally arranged horizontal pipes 44; an upper connecting head 41 for fixed connection with the connecting plate 13 is provided above the rectangular frame, and the upper connecting head 41 and the rectangular frame are in the same plane, and the upper connecting head 41 is fixedly connected to the rectangular frame through two supporting pipes 42; the upper connecting head 41 is rod-shaped, and first through holes are opened at both ends of the upper connecting head 41, and the first through holes are connected to the long slot holes on the connecting plate 13 through pins;

[0048] A long pad 43 is provided at the top of the vertical tube 45, and a handrail 48 for easy installation is provided in the middle section of the vertical tube 45; a short pad 46 is provided at the bottom end of the vertical tube 45, and a lower connecting head 47 for fixed connection with the upper support 3 is provided at the bottom end of the short pad 46; a base 31 for fixed connection with the lower connecting head 47 is provided at one end of the upper support 3 close to the arm 2; a second through hole is provided on the lower connecting head 47, and a circular hole is provided on the base 31, and the second through hole is connected to the circular hole on the base 31 through a pin shaft.

[0049] A method for installing a direct connection structure of a balancing arm, an arm frame and an upper support comprises the following steps:

[0050] Step 1, use a pin to install the mounting frame 4 on the long slot hole 17 in the two balance arm upper chord connecting plates 13, and then insert the pin into the pin hole 18 on the connecting plate 13, so that the mounting frame 4 is supported on the outside of the pin to keep it in its position; in step 1, the mounting frame 4 can be installed in the balance arm upper chord connecting plate 13 in advance, and then the pin is inserted into the pin hole 18 on the connecting plate 13, so that the mounting frame 3 is supported on the inside of the pin to keep it in its position; before installing the balance arm 1, it is only necessary to remove the pin on the pin hole 18, pull the mounting frame 4 outward, and remove the pin into the pin hole 18 after exceeding the pin hole 18, so that the mounting frame 4 is supported on the outside of the pin to keep it in its position.

[0051] Step 2, use screw pins to install the gusset frame 5 on the hinge holes 34 of the first fixing plate 321 and the second fixing plate 322 of the upper support, and then insert the latch 6 into the latch holes 33 of the first fixing plate 321 and the second fixing plate 322, so that the gusset frame 5 is in an open state and is arranged in pairs;

[0052] Step 3, lift the balancing arm 1 with auxiliary equipment, make the first connection group 15 on the balancing arm 1 lean against the first fixing plate 321 on the upper support 3, pull out the latch 6, fix the latch 6 into the insert 53 on the gusset frame 5, close the gusset frame 5, and then fix the gusset frame 5 with a screw shaft;

[0053] Step 4, rotating the balancing arm 1 through the round steel 16 on the first connection group 15, so that the mounting frame 5 is close to the base 31 on the upper support 3, and fixed, so that the balancing arm 1 is fixed on the upper support 3;

[0054] Step 5, lift the boom 2 with auxiliary equipment, so that the second connection group 24 on the boom 2 is within the range of the second fixing plate 322 of the upper support 3, and connect the boom single ear plate 23 and the balance arm double ear plate 12 together with a pin shaft;

[0055] Step 6, slowly descend, when the second connection group 24 on the arm 2 is close to the second fixing plate 322 of the upper support 3, pull out the latch 6, fix the latch 6 into the insert 53 on the gusset frame 5, close the gusset frame 5, and then use the screw shaft to fix the gusset frame 5. In step 6, because the weight of the arm 2 itself will pull the balance arm 1 to rotate through the first round steel 16 of the lower chord of the balance arm, the mounting frame 4 will move in the direction of the long slot hole 17 of the connecting plate.

[0056] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the present invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A method for installing a direct connection structure of a balancing arm, an arm frame and an upper support, characterized in that: The used direct connection structure of the balance arm, arm frame and upper support comprises an upper support (3) arranged horizontally, the upper support (3) is provided with a balance arm (1) and an arm frame (2) on the left and right sides in the horizontal direction respectively, and the balance arm (1) and the arm frame (2) extend in opposite directions along the same straight line; The balancing arm (1) comprises a balancing arm upper chord rod (11) and two balancing arm lower chord rods (14); the arm frame (2) comprises an arm frame upper chord rod (21) and two arm frame lower chord rods (22); and the cross-sections of the balancing arm (1) and the arm frame (2) are both triangular cross-sections; A double-ear plate (12) is provided at one end of the balancing arm upper chord (11) close to the upper support (3), and a single-ear plate (23) is provided at one end of the arm frame upper chord (21) close to the upper support (3). Connecting holes are coaxially provided on the single-ear plate (23) and the double-ear plate (12), and the double-ear plate (12) of the balancing arm upper chord (11) is connected to the single-ear plate (23) of the arm frame upper chord (21) via a pin shaft; A first connection group (15) is provided at one end of the balance arm lower chord (14) close to the upper support (3); a pair of first fixing plates (321) are provided at a position of the upper support (3) corresponding to the first connection group (15); the pair of first fixing plates (321) are symmetrically arranged at the front and rear sides of the first connection group (15); the first connection group (15) comprises a first round steel (16) and a first round steel mounting seat; the first round steel mounting seat is provided with a first mounting hole; the first round steel (16) is inserted into the first mounting hole and the two ends thereof extend out to the same length; the first fixing plate (321) ) is fixedly connected to the upper support (3) at one end, and is provided with a latch hole (33), a hinge hole (34), a fixing hole (35) and an open curved groove at the other end; a latch hole (33) for preventing the gusset frame (5) from closing is provided above the open curved groove, a hinge hole (34) for hinged connection with the first hole (55) on the gusset frame (5) is provided obliquely above, and a fixing hole (35) for fixing the gusset frame (5) is provided below; the protruding end of the first round steel (16) is arranged in the open curved groove, and the gusset frame (5) is hingedly connected to the outer side of the first fixing plate (321); The gusset plate frame (5) comprises a gusset plate (51), the gusset plate (51) is a generally U-shaped plate structure, a first hole (55) is provided at a position corresponding to the hinge hole (34) of the gusset plate (51), a round plate (52) is provided on the side of the first hole (55) close to the first fixing plate (321), a second hole (56) is provided at a position corresponding to the fixing hole (35) of the first hole gusset plate (51), an insertion tube (53) for inserting a latch pin (6) and a gusset plate (51) are provided on the gusset plate (51) to facilitate closing or opening the gusset plate. The handle (54) of the frame (5) is provided; when the buckle frame (5) is buckled, the groove of the buckle plate (51) and the open curved groove form a storage space for accommodating the first round steel (16), and the second hole (56) is connected to the fixing hole (35) through a pin shaft; the latch (6) is fixedly connected to the handle (54) through a chain, and when the buckle frame (5) is buckled, the latch (6) is inserted into the insertion tube (53), and when the buckle frame (5) is opened, the latch (6) is inserted into the latch hole (33) to prevent the buckle frame (5) from closing; A second connection group (24) is provided at one end of the lower chord rod (22) of the arm frame close to the upper support (3); a pair of second fixing plates (322) are provided at a position of the upper support (3) corresponding to the second connection group (24); the pair of second fixing plates (322) are symmetrically arranged at the front and rear sides of the second connection group (24); the second connection group (24) comprises a second round steel (25) and a second round steel mounting seat; the second round steel mounting seat is provided with a second mounting hole; the second round steel (25) is inserted into the second mounting hole and the two ends thereof extend out to the same length; the structure of the second fixing plate (322) is a mirror image of the structure of the first fixing plate (321); the connection method of the second connection group (24) and the second fixing plate (322) is consistent with the connection method of the first connection group (15) and the first fixing plate (321); The invention also comprises a mounting frame (4) for assisting the installation of the balancing arm (1), a pair of connecting plates (13) being provided on one side of the lower end of the double-ear plate (12) close to the upper support (3), the pair of connecting plates (13) being symmetrically arranged on the front and rear sides of the top of the mounting frame (4), and the connecting plates (13) being provided with long slot-shaped holes (17) for fixed connection with the mounting frame (4) and pin holes (18) for acting as a gear frame in sequence from top to bottom; the mounting frame (4) comprises a rectangular frame which is at a certain angle to the horizontal plane, and the rectangular frame is composed of two inclined The rectangular frame is composed of a vertical tube (45) and two horizontally arranged horizontal tubes (44); an upper connecting head (41) for fixedly connecting to the connecting plate (13) is arranged above the rectangular frame, the upper connecting head (41) and the rectangular frame are in the same plane, and the upper connecting head (41) is fixedly connected to the rectangular frame through two supporting tubes (42); the upper connecting head (41) is rod-shaped, and first through holes are opened at both ends of the upper connecting head (41), and the first through holes are connected to the long slot-shaped holes on the connecting plate (13) through a pin shaft; A long pad (43) is provided at the top of the vertical tube (45), and a handrail (48) is provided in the middle section of the vertical tube (45) for easy installation; a short pad (46) is provided at the bottom end of the vertical tube (45), and a lower connecting head (47) for fixed connection with the upper support (3) is provided at the bottom end of the short pad (46); a base (31) for fixed connection with the lower connecting head (47) is provided at one end of the upper support (3) close to the arm support (2); a second through hole is provided on the lower connecting head (47), and a circular hole is provided on the base (31), and the second through hole is connected to the circular hole on the base (31) through a pin shaft; The installation method includes the following steps: Step 1, using a pin to install the mounting frame (4) on the long slot-shaped hole (17) in the connecting plates (13) of the two balancing arms, and then inserting the pin into the pin hole (18) on the connecting plate (13), so that the mounting frame (4) is supported on the outer side of the pin; Step 2, using screw pins to respectively install the pinch plate frame (5) on the hinge holes (34) of the first fixing plate (321) and the second fixing plate (322) of the upper support (3), and then using the latch pin (6) to respectively insert into the latch pin holes (33) of the first fixing plate (321) and the second fixing plate (322), so that the pinch plate frame (5) is in an open state and is arranged in pairs; Step 3, using auxiliary equipment to lift the balancing arm (1), so that the first connection group (15) on the balancing arm (1) is against the first fixing plate (321) on the upper support (3), the latch (6) is pulled out, the latch (6) is fixed to the insertion tube (53) on the pinch plate frame (5), the pinch plate frame (5) is closed, and the pinch plate frame (5) is fixed with a screw shaft; Step 4, rotating the balancing arm (1) through the first round steel (16) on the first connection group (15), so that the mounting frame (4) is close to the base (31) on the upper support (3), and fixed, so that the balancing arm (1) is fixed on the upper support (3); Step 5, using auxiliary equipment to hoist the arm (2) so that the second connection group (24) on the arm (2) is within the range of the second fixing plate (322) of the upper support (3), and the arm single ear plate (23) and the balance arm double ear plate (12) are connected together by a pin shaft; Step 6, slowly descend, when the second connection group (24) on the arm (2) is close to the second fixing plate (322) of the upper support (3), pull out the latch (6), fix the latch (6) into the insert (53) on the pinch plate frame (5), close the pinch plate frame (5), and then fix the pinch plate frame (5) with a screw shaft.

2. The method for installing the direct connection structure of the balance arm, the arm frame and the upper support according to claim 1, characterized in that: In the step 1, the mounting frame (4) is installed in advance in the connecting plate (13) of the upper chord of the balance arm, and then a pin is inserted into the pin hole (18) on the connecting plate (13) so that the mounting frame (4) is supported on the inner side of the pin to keep it in its position; Before installing the balance arm (1), it is only necessary to remove the pin from the pin hole (18), pull the mounting frame (4) outward, and remove the pin into the pin hole (18) when it exceeds the pin hole (18), so that the mounting frame (4) is supported on the outside of the pin and maintained in its position.

3. The method for installing the direct connection structure of the balance arm, the arm frame and the upper support according to claim 1, characterized in that: In step 6, the arm frame (2) will pull the balance arm (1) to rotate through the first round steel (16) of the lower chord of the balance arm due to its own weight, and the mounting frame (4) will move in the direction of the long slot hole (17) of the connecting plate.

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