A down-type working platform

Abstract

The present invention relates to a downward-probing work platform, including a telescopic arm assembly and a work platform assembly. Due to the arrangement of the work platform assembly, if the hinge point is arranged very high, it will be too high; if the hinge point is arranged very low, the cross support cylinder will be too close to the ground after the arm is extended vertically. The present invention sets a parallelogram mechanism to lower the parallelogram during vehicle transportation to meet the transportation height requirement, and raise the parallelogram during operation to increase the height of the platform from the ground when erected, thereby overcoming the limitations of various construction environment conditions. The present invention also sets a telescopic platform and a flap, so that the work platform assembly can be telescoped and rotated, and the deployment and retraction of the work platform assembly are realized, thereby improving the scope of application of the work platform.

Description

Technical Field

[0001] The invention relates to the technical field of deep pit and deep well construction, and in particular to a downward-exploring working platform. Background Art

[0002] At present, deep pit and well operation working platforms are mainly of suspended type and lifting type:

[0003] 1. Suspension type. It is mainly powered by lifting equipment such as cranes or gantry cranes, connected to the basket or cage through slings, and moves up and down in the deep pit. Since the suspended cage is based on the steel cable of the lifting equipment, the cage cannot be effectively fixed to the pit or well wall during the operation, and the shaking amount is large, which affects the operation; moreover, most lifting equipment is designed with a single cable pulley, and the sling has no redundancy, which is greatly restricted by objective environmental conditions.

[0004] 2. Lifting type. It is mainly rooted from bottom to top, mainly with various scaffolding erection, suitable for working conditions with large workload and long operation time. Since the erection of scaffolding takes a long time, in some cases it is necessary to pre-cast the foundation platform in a deep pit or well, and fix the truss columns with reserved anchor bolts. This operation method has high requirements for the foundation and is more restricted by environmental conditions. Summary of the invention

[0005] The purpose of the present invention is to provide a downward-exploring work platform provided with a parallelogram mechanism and a work platform assembly, which can overcome the limitations of various construction environment conditions and improve the application scope of the work platform.

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

[0007] A downward-reaching work platform comprises: a support connecting member assembly and a telescopic arm assembly, a sliding platform assembly, a work platform assembly and an electrical control system arranged on the support connecting member assembly; the electrical control system is respectively connected to the telescopic arm assembly, the sliding platform assembly and the work platform assembly;

[0008] The sliding platform assembly comprises: a sliding platform and a parallelogram mechanism, the sliding platform is movably connected to the supporting connecting member assembly, the parallelogram mechanism comprises a first vertical beam, a second vertical beam, a cross beam and a parallelogram support, the parallelogram support is arranged on the sliding platform, one end of the first vertical beam and one end of the second vertical beam are hinged to the parallelogram support, and the other end of the first vertical beam and the other end of the second vertical beam are hinged to the cross beam;

[0009] The telescopic arm assembly comprises n telescopic arms nested in sequence from outside to inside; the outermost telescopic arm is the first telescopic arm, and the innermost telescopic arm is the nth telescopic arm; the first telescopic arm is hinged to the crossbeam;

[0010] The working platform assembly is connected to the telescopic arm assembly, and the working platform includes a telescopic platform and a flap;

[0011] The electrical control system is used to drive the sliding platform to slide on the supporting connector assembly, drive the parallelogram mechanism to deform, control the telescopic arm assembly to extend and retract, control the telescopic platform to extend and retract, and control the flap to extend and retract.

[0012] Preferably, the working platform assembly is a single-layer platform, and the working platform assembly is connected to the arm head of the nth telescopic arm.

[0013] Preferably, the working platform assembly is a double-layer platform, including an upper platform assembly and a lower platform assembly;

[0014] The upper platform assembly includes a telescopic platform; the telescopic platform is connected to the arm head of any one of the 2nd to n-1th telescopic arms;

[0015] The lower platform assembly includes a base platform and a plurality of flaps arranged at the bottom of the base platform; the base platform is connected to the arm head of the nth telescopic arm.

[0016] Preferably, it also includes a plurality of front vertical outrigger cylinders and a plurality of rear swing outrigger assemblies;

[0017] A plurality of front vertical leg oil cylinders are symmetrically fixed on the fixed legs on the left and right sides of the support connecting member assembly, and the front vertical leg oil cylinders are used to support the front part of the support connecting member assembly;

[0018] The rear swing leg assembly includes a rear swing leg oil cylinder, a rear vertical leg oil cylinder, a rear swing leg and a connecting rod mechanism;

[0019] A plurality of rear swing legs are symmetrically hinged on the fixed legs on the left and right sides of the support connecting member assembly; the rear vertical leg cylinder is arranged on the rear swing leg, and the rear vertical leg is used to support the rear part of the support connecting member assembly; one end of the connecting rod mechanism and one end of the rear swing leg cylinder are connected to the rear swing leg; the other end of the connecting rod mechanism is connected to the other end of the rear swing leg cylinder; the rear swing leg cylinder is used to control the swing of the rear swing leg.

[0020] Preferably, it also includes a cross support cylinder assembly;

[0021] The cross support cylinder assembly is arranged at the bottom of the lower platform, and the cross support cylinder assembly includes a mounting plate, a cross support cylinder and a universal roller ball; the cross support cylinder is fixed to the bottom surface of the mounting plate, and the cross support cylinder is used to support the telescopic arm assembly; the universal roller ball is arranged at the tail of the cross support cylinder.

[0022] Preferably, it also includes a cover assembly;

[0023] The cover assembly is arranged on the support connector assembly, and the cover assembly includes a tool box, a walkway, a fender and a ladder;

[0024] The mudguard is arranged at the front wheel of the support connecting member assembly; the walkway cover is arranged on the surface of the support connecting member assembly; the tool box is fixed to the support connecting member assembly by bolts; the ladder is arranged on one side of the support connecting member assembly, and the ladder is connected to the support connecting member assembly.

[0025] Preferably, the electrical control system includes a hydraulic system and a motor drive system;

[0026] The hydraulic system comprises: a sliding cylinder, a first luffing cylinder, a second luffing cylinder, a multiple telescopic cylinder, a single telescopic cylinder and an expansion cylinder;

[0027] One end of the sliding cylinder is connected to the sliding platform, and the other end of the sliding cylinder is connected to the sub-frame 2, and the sliding cylinder is used to drive the sliding platform to slide on the supporting connecting member assembly;

[0028] One end of the first luffing oil cylinder is connected to the parallelogram support, and the other end of the first luffing oil cylinder is connected to the first vertical beam, and the first luffing oil cylinder is used to drive the parallelogram mechanism to deform;

[0029] The second luffing cylinder includes a first single-cylinder luffing cylinder and a second single-cylinder luffing cylinder; the first single-cylinder luffing cylinder and the second single-cylinder luffing cylinder are symmetrically arranged on the parallelogram support, one end of the first single-cylinder luffing cylinder and one end of the second single-cylinder luffing cylinder are both connected to the first telescopic arm, and the second luffing cylinder is used to drive the upper platform assembly and the lower platform assembly to rise and fall in the vertical direction;

[0030] The multiple telescopic cylinders include a plurality of telescopic cylinders; the telescopic cylinders are connected to the second to the n-1th telescopic arms and one telescopic cylinder is correspondingly connected to one telescopic arm; the telescopic cylinders are used to drive the telescopic arms to extend and retract;

[0031] The single telescopic cylinder is connected to the nth telescopic arm, and is used to drive the nth telescopic arm to telescope; the single telescopic cylinder is controlled by a first multi-way valve; the multiple telescopic cylinders are controlled by a second multi-way valve;

[0032] The lower platform assembly also includes a sliding assembly; the base platform is connected to the deployment cylinder through the sliding assembly, and the deployment cylinder is used to drive the flap to be deployed and recovered;

[0033] The motor drive system comprises: an electric rotary reducer and a motor. The electric rotary reducer drives the telescopic platform to extend and retract through a rack. The motor completes the rotation of the telescopic platform through a worm gear rotary mechanism.

[0034] Preferably, any two telescopic arms from the 2nd to the n-1th telescopic arms are connected in sequence by an extension cable chain and a retraction cable chain.

[0035] Preferably, a through hole is provided on the flange plate on the n-1th telescopic arm, and a hose reel and a cable reel are also provided at the through hole; the pipeline of the lower platform passes through the hose reel and the cable reel and enters the through hole.

[0036] Preferably, the telescopic platform includes a first platform and a second platform; the first platform is fixedly arranged on the arm head of any one of the 2nd to n-1th telescopic arms, and the first platform is movably connected to the second platform through the rack and the worm gear slewing mechanism; the electric rotary reducer is arranged on the first platform, the motor is connected to the worm gear slewing mechanism, and the rack is arranged on both sides of the telescopic platform; the electric rotary reducer is arranged in contact with the rack.

[0037] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0038] The present invention provides a downward-expanding work platform, including a telescopic arm assembly, a work platform assembly, etc. Due to the platform layout, if the hinge point is arranged very high, it will be too high; if the hinge point is arranged very low, the cross support cylinder will be too close to the ground after the arm is extended vertically. The present invention sets a parallelogram mechanism to lower the parallelogram during vehicle transportation to meet the transportation height requirement, and raise the parallelogram during operation to increase the height of the platform from the ground when erected, thereby overcoming the limitations of various construction environment conditions, and the present invention also sets a work platform assembly so that the platform assembly can be telescoped, rotated, unfolded and retracted, thereby increasing the scope of application of the work platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0040] Figure 1 It is a schematic diagram of the overall device of the downward-reaching working platform of the present invention;

[0041] Figure 2 A top view of a subframe provided in an embodiment of the present invention;

[0042] Figure 3 A side view of a subframe provided in an embodiment of the present invention;

[0043] Figure 4 A side view of the position of the supporting legs provided in an embodiment of the present invention;

[0044] Figure 5 A top view of the position of the supporting legs provided in an embodiment of the present invention;

[0045] Figure 6 A schematic diagram of the structure of a basic arm provided in an embodiment of the present invention;

[0046] Figure 7 It is a structural schematic diagram of a first telescopic arm provided in an embodiment of the present invention;

[0047] Figure 8 It is a schematic structural diagram of a second telescopic arm provided in an embodiment of the present invention;

[0048] Fig. 9 It is a schematic structural diagram of a third telescopic arm provided in an embodiment of the present invention;

[0049] Fig.10 It is a schematic structural diagram of a fourth telescopic arm provided in an embodiment of the present invention;

[0050] Fig.11 It is a schematic diagram of the structure of the telescopic arm assembly provided in an embodiment of the present invention;

[0051] Fig.12 It is a perspective schematic diagram of a telescopic arm assembly provided in an embodiment of the present invention;

[0052] Fig.13 A top view of an upper platform assembly provided in an embodiment of the present invention;

[0053] Fig.14 A side view of an upper platform assembly provided in an embodiment of the present invention;

[0054] Fig.15A side view of an extended platform provided in an embodiment of the present invention;

[0055] Fig.16 A top view of an extended platform provided in an embodiment of the present invention;

[0056] Fig.17 It is a top view of the lower platform assembly provided in an embodiment of the present invention;

[0057] Fig.18 It is an unfolded side view of the lower platform assembly provided in an embodiment of the present invention;

[0058] Fig.19 A side view of the lower platform assembly retracted according to an embodiment of the present invention;

[0059] Fig. 20 A top view of a cross support cylinder assembly provided in an embodiment of the present invention;

[0060] Fig.21 A side view of a cross support cylinder assembly provided in an embodiment of the present invention;

[0061] Fig. 22 Schematic diagram of a hydraulic oil tank provided in an embodiment of the present invention.

[0062] Explanation of symbols:

[0063] 1-support chassis, 2-subframe, 3-telescopic arm assembly, 4-sliding platform assembly, 5-upper platform assembly, 6-lower platform assembly, 7-cross support cylinder assembly, 8-front vertical outrigger cylinder, 9-rear swing outrigger assembly, 10-cover assembly, 11-hydraulic oil tank, 31-basic arm, 32-first telescopic arm, 33-second telescopic arm, 34-third telescopic arm, 35-fourth telescopic arm, 51-extended platform. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0065] The purpose of the present invention is to provide a downward-exploring work platform provided with a parallelogram mechanism, a telescopic platform and a flap, which can overcome the limitations of various construction environment conditions and improve the application scope of the work platform.

[0066] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0067] Figure 1 FIG. 1 is a schematic diagram of the overall device of the downward-reaching working platform of the present invention, as shown in FIG. Figure 1 As shown, a downward-exploring work platform of the present invention comprises: a supporting connecting member assembly, a telescopic arm assembly 3, a sliding platform assembly 4, an upper platform assembly 5, a lower platform assembly 6, a cross-support cylinder assembly 7, a cover assembly 10, a plurality of front vertical outrigger oil cylinders 8, a plurality of rear swing outrigger assemblies 9 and an electrical control system; the electrical control system is respectively connected to the telescopic arm assembly 3, the sliding platform assembly 4, the upper platform assembly 5 and the lower platform assembly 6;

[0068] The sliding platform assembly 4 includes: a sliding platform and a parallelogram mechanism, the sliding platform is movably connected to the supporting connecting member assembly, the parallelogram mechanism includes a first vertical beam, a second vertical beam, a cross beam and a parallelogram support, the parallelogram support is arranged on the sliding platform, one end of the first vertical beam and one end of the second vertical beam are hinged to the parallelogram support, and the other end of the first vertical beam and the other end of the second vertical beam are hinged to the cross beam;

[0069] The telescopic arm assembly 3 includes n telescopic arms nested in sequence from outside to inside; the outermost telescopic arm is the first telescopic arm, and the innermost telescopic arm is the nth telescopic arm; the first telescopic arm is hinged to the crossbeam;

[0070] The upper platform assembly 5 includes a telescopic platform; the telescopic platform is connected to the arm head of any one of the 2nd to n-1th telescopic arms;

[0071] The lower platform assembly 6 includes a base platform and a plurality of flaps arranged at the bottom of the base platform; the base platform is connected to the arm head of the nth telescopic arm;

[0072] The electrical control system is used to drive the sliding platform to slide on the supporting connector assembly, drive the parallelogram mechanism to deform, control the telescopic arm assembly 3 to extend and retract, control the telescopic platform to extend and retract, and control the flap to extend and retract.

[0073] The cross support cylinder assembly 7 is arranged at the bottom of the lower platform, and the cross support cylinder assembly 7 includes a mounting plate, a cross support cylinder and a universal ball; the cross support cylinder is fixed to the bottom surface of the mounting plate, and the cross support cylinder is used to support the telescopic arm assembly 3; the universal ball is arranged at the tail of the cross support cylinder.

[0074] In this embodiment, the working platform assembly is a double-layer platform, including an upper platform assembly and a lower platform assembly.

[0075] Specifically, the work platform assembly can also be single-layer or multi-layer.

[0076] The cover assembly 10 is arranged on the support connector assembly, and the cover assembly 10 includes a tool box, a walkway, a fender and a ladder;

[0077] The mudguard is arranged at the front wheel of the support connecting member assembly; the walkway cover is arranged on the surface of the support connecting member assembly; the tool box is fixed to the support connecting member assembly by bolts; the ladder is arranged on one side of the support connecting member assembly, and the ladder is connected to the support connecting member assembly.

[0078] A plurality of front vertical leg oil cylinders 8 are symmetrically fixed on the fixed legs on the left and right sides of the support connecting member assembly, and the front vertical leg oil cylinders 8 are used to support the front part of the support connecting member assembly;

[0079] The rear swing leg assembly 9 includes a rear swing leg oil cylinder, a rear vertical leg oil cylinder, a rear swing leg and a connecting rod mechanism;

[0080] A plurality of rear swing legs are symmetrically hinged on the fixed legs on the left and right sides of the support connecting member assembly; the rear vertical leg cylinder is arranged on the rear swing leg, and the rear vertical leg is used to support the rear part of the support connecting member assembly; one end of the connecting rod mechanism and one end of the rear swing leg cylinder are connected to the rear swing leg; the other end of the connecting rod mechanism is connected to the other end of the rear swing leg cylinder; the rear swing leg cylinder is used to control the swing of the rear swing leg.

[0081] Specifically, the supporting connecting component assembly includes a supporting chassis 1 and a subframe 2 arranged on the supporting chassis 1. The subframe 2 mainly includes a subframe 2 structure, a sliding cylinder, a telescopic arm bracket and other mounting parts. The subframe 2 is the installation basis for components such as the hydraulic oil tank 11, the sliding platform, and the front telescopic legs, the swing legs, etc., and is connected and fixed to the chassis by welding, bolts and other parts.

[0082] Figure 2 and Figure 3 They are respectively a top view and a side view of the subframe 2 provided in an embodiment of the present invention, as shown in Figure 2 and Figure 3 As shown, the structure of the subframe 2 is mainly composed of a longitudinal beam, a transverse beam, a front fixed leg, a rear fixed leg and a mounting bracket for the hydraulic oil tank 11. The front section of the longitudinal beam is a box structure, the lower part of the rear section is a box structure, and the upper part is an I-shaped structure. The sliding platform slides on the first section of the I-shaped structure. The hydraulic oil tank 11 is installed on the mounting bracket of the hydraulic oil tank 11. The front fixed leg is the mounting base of the front telescopic leg, and the rear fixed leg is the mounting base of the rear swing leg.

[0083] In this embodiment, the supporting chassis 1 is a 6×4 chassis of Qihaowo, chassis model ZZ1257N584GE1, and main parameters are shown in Table 1.

[0084] Table 1

[0085]

[0086] As an optional implementation, after the front vertical leg cylinder 8 is installed on the sub-frame 2, the full retraction distance of the front vertical leg is 633 mm from the ground. The front vertical leg cylinder 8 mainly completes the ground support stability of the front leg, and the parameters are:

[0087] The cylinder diameter is φ115mm, the rod diameter is φ90mm, and the stroke is 760mm.

[0088] Optionally, the rear swing leg assembly 9 is mainly composed of a rear swing leg structure, a vertical oil cylinder, a swing oil cylinder, a connecting rod mechanism, etc. Figure 4 and Figure 5 They are respectively a side view and a top view of the leg positions provided in an embodiment of the present invention, as shown in Figure 4 and Figure 5 As shown, the rear swing leg assembly 9 is installed on the subframe 2, and is symmetrically arranged on the left and right sides. The swing of the swing leg can be controlled by the swing cylinder, and the swing leg is in an eight-shaped shape in the fully extended state. The swing cylinder has a cylinder diameter of φ90mm, a rod diameter of φ50mm, and a stroke of 995mm. The swing cylinder mainly completes the rearward swing function of the swing leg, and the connecting rod mechanism is mainly used to realize the swing of the swing leg to a large angle backward.

[0089] Preferably, the electrical control system includes a hydraulic system and a motor drive system;

[0090] The hydraulic system comprises: a sliding cylinder, a first luffing cylinder, a second luffing cylinder, a multiple telescopic cylinder, a single telescopic cylinder and an expansion cylinder;

[0091] One end of the sliding cylinder is connected to the sliding platform, and the other end of the sliding cylinder is connected to the sub-frame 2, and the sliding cylinder is used to drive the sliding platform to slide on the supporting connecting member assembly;

[0092] One end of the first luffing oil cylinder is connected to the parallelogram support, and the other end of the first luffing oil cylinder is connected to the first vertical beam, and the first luffing oil cylinder is used to drive the parallelogram mechanism to deform;

[0093] The second luffing cylinder includes a first single-cylinder luffing cylinder and a second single-cylinder luffing cylinder; the first single-cylinder luffing cylinder and the second single-cylinder luffing cylinder are symmetrically arranged on the parallelogram support, one end of the first single-cylinder luffing cylinder and one end of the second single-cylinder luffing cylinder are both connected to the first telescopic arm, and the second luffing cylinder is used to drive the upper platform assembly 5 and the lower platform assembly 6 to rise and fall in the vertical direction;

[0094] The multiple telescopic cylinders include a plurality of telescopic cylinders, each of which is connected to the second to n-1 telescopic arms, and one telescopic cylinder is connected to one telescopic arm; the telescopic cylinder is used to drive the telescopic arms to extend and retract;

[0095] The single telescopic cylinder is connected to the nth telescopic arm, and is used to drive the nth telescopic arm to extend and retract; the single telescopic cylinder is controlled by a first multi-way valve; the multiple telescopic cylinders are controlled by a second multi-way valve;

[0096] The deployment cylinder is connected to the sliding assembly, and the deployment cylinder is used to drive the flap to be deployed and recovered;

[0097] The motor drive system comprises: an electric rotary reducer and a motor. The electric rotary reducer drives the telescopic platform to extend and retract through a rack. The motor completes the rotation of the telescopic platform through a worm gear rotary mechanism.

[0098] Preferably, any two telescopic arms from the 2nd to the (n-1)th telescopic arms are connected in sequence by an extension cable chain and a retraction cable chain.

[0099] Preferably, a through hole is provided on the flange plate on the n-1th telescopic arm, and a hose reel and a cable reel are also provided at the through hole; the pipeline of the lower platform passes through the hose reel and the cable reel and enters the through hole.

[0100] Preferably, the telescopic platform includes a first platform and a second platform; the first platform is fixedly arranged on the arm head of any one of the 2nd to n-1th telescopic arms, and the first platform is movably connected to the second platform through the rack and the worm gear slewing mechanism; the electric rotary reducer is arranged on the first platform, the motor is connected to the worm gear slewing mechanism, and the rack is arranged on both sides of the telescopic platform; the electric rotary reducer is arranged in contact with the rack.

[0101] Optionally, the sliding platform assembly 4 mainly includes a sliding platform, a parallelogram mechanism, a first luffing cylinder and a second luffing cylinder. The sliding platform assembly 4 is connected to the subframe 2 and the sliding cylinder at the bottom, and is connected to the telescopic arm assembly 3 at the top, mainly completing the backward sliding of the working platform and the luffing and erecting functions of the working platform. The sliding platform is welded by two vertical beams and two box-type mechanisms. In order to meet the height requirements of the whole vehicle, the upper plane is recessed downward, and the connecting hinge support of the luffing cylinder and the parallelogram mechanism is set on it, and the connecting support of the sliding cylinder is set on the lower surface. The parallelogram mechanism mainly completes the lifting function of the platform to prevent the platform from being 500mm away from the ground when erected.

[0102] Specifically, the first luffing cylinder has a cylinder diameter of φ180mm, a rod diameter of φ125mm, and a stroke of 652mm. The first luffing cylinder mainly completes the function of lifting the platform. The second luffing is a double-cylinder luffing cylinder, including a first single-cylinder luffing cylinder and a second single-cylinder luffing cylinder. The cylinder diameter is φ110mm, the rod diameter is φ90mm, and the stroke is 3117mm. The second luffing cylinder mainly completes the function of vertically erecting the platform.

[0103] Figures 6 to 11 The schematic diagrams of the structures of the basic arm 31, the first telescopic arm 32, the second telescopic arm 33, the third telescopic arm 34, the fourth telescopic arm 35 and the telescopic arm assembly 3 provided in the embodiments of the present invention are shown in FIG. Figures 6 to 11 As shown, in this embodiment, the number of telescopic arms is 5, of which the first telescopic arm is the basic arm 31. The telescopic arm assembly 3 mainly completes the platform's downward exploration and retraction functions and is the core component of the working platform. It mainly consists of the basic arm 31, the first telescopic arm 32, the second telescopic arm 33, the third telescopic arm 34, and the fourth telescopic arm 35. The third telescopic arm 34 is connected to the upper platform, and the fourth telescopic arm 35 is connected to the lower platform. The fourth telescopic arm 35 can be extended and retracted independently. Fig.12 FIG. 3 is a perspective schematic diagram of a telescopic arm assembly 3 provided in an embodiment of the present invention, as shown in FIG. Fig.12 As shown, twin telescopic cylinders (multiple telescopic cylinders), extension cable chains, retraction cable chains and the fourth telescopic cylinder are all arranged inside the telescopic arm. The first telescopic arm 32 can be extended by the first telescopic cylinder in the twin telescopic cylinders, the second telescopic arm 33 and the third telescopic arm 34 can be synchronously extended and retracted by the second telescopic cylinder and the chain puller in the twin telescopic cylinders, and the fourth telescopic cylinder can control the extension and retraction of the fourth telescopic arm 35.

[0104] Specifically, the main structure of the basic arm 31 is welded by upper and lower plates, the arm thickness is 5mm, the cross-section shape is octagonal, the arm length is 8270mm, and the main steel structure material is Q690D.

[0105] Optionally, the main structure of the second telescopic arm 33 is welded by upper and lower plates, the arm thickness is 4 mm, the cross-section shape is octagonal, and the arm length is 8230 mm. The main steel structure material is Q690D.

[0106] Specifically, the main structure of the third telescopic arm 34 is welded by upper and lower plates, with an arm thickness of 4mm, an octagonal cross-section, and an arm length of 8465mm. The main steel structure material is Q690D. The arm head of the third telescopic arm 34 contains a double-layer flange, the lower flange is connected to the upper platform, and the upper flange fills the gap between the upper platform and the arm body. The double-layer flanges are both opened with pipes and lines connected to the lower platform to prevent the upper platform from being entangled in the pipes when rotating.

[0107] Optionally, the main structure of the fourth telescopic arm 35 is welded by upper and lower plates, the arm thickness is 4mm, the cross-section shape is octagonal, and the arm length is 8375mm. The main material of the steel structure is Q690D. The arm head of the fourth telescopic arm 35 contains a flange, which is mainly used to connect the lower platform.

[0108] As an optional implementation, the twin telescopic cylinders are mainly composed of a first telescopic cylinder, a second telescopic cylinder and a pulley. The first telescopic cylinder mainly drives the first telescopic arm 32 to extend and retract, and the second telescopic cylinder mainly drives the second telescopic arm 33 to extend and retract. The pulley mainly plays a guiding role so that the twin telescopic cylinders do not move in the arm body. There is a slideway between the first telescopic cylinder and the second telescopic cylinder to prevent the first telescopic cylinder from getting stuck when it is extended and retracted outside the last telescopic arm. The oil circuits of the two telescopic cylinders are interconnected and controlled by a 1-way multi-way valve.

[0109] Optionally, the cylinder diameter of the first telescopic cylinder is φ100 mm, the rod diameter is φ63 mm, and the stroke is 7000 mm.

[0110] Specifically, the cylinder diameter of the second telescopic cylinder is φ100 mm, the rod diameter is φ63 mm, and the stroke is 7000 mm.

[0111] As an optional implementation, the fourth telescopic cylinder mainly realizes the extension and retraction of the fourth telescopic arm 35. The tail of the fourth telescopic cylinder contains a pulley, which mainly plays a guiding role so that the fourth telescopic cylinder does not move in the arm body. The fourth telescopic cylinder is controlled by a single multi-way valve and can achieve independent extension and retraction.

[0112] Optionally, the cylinder diameter of the fourth telescopic cylinder is φ90 mm, the rod diameter is φ63 mm, and the stroke is 7000 mm.

[0113] As an optional implementation, the tension cable chain uses a plate chain LH1046, the number is 2, and the tensile strength is 66.7KN. After analysis, the arm body is mainly extended by the weight of the arm body when it is vertically extended, so the tension cable chain is not under force at this time. The main reasons for retaining the tension cable chain here are: 1. There is no well during factory commissioning, and it needs to be extended horizontally; 2. Since the last section of the telescopic arm needs to be extended separately, it is necessary to wrap the pipe inside the arm body, and the direction of the pipe is consistent with the tension cable. Retaining it here can prevent the danger of breaking the pipeline.

[0114] Optionally, the retractable cable chain adopts a plate chain LH1666, the number is 2, and the tensile strength is 253.6KN, which is mainly used to retract the third telescopic arm 34 and hold the third telescopic arm 34 to prevent it from falling when the arm body stops.

[0115] Fig.13 and Fig.14 They are respectively a top view and a side view of the upper platform assembly 5 provided in an embodiment of the present invention, as shown in Fig.13 and Fig.14 As shown, the telescopic platform is mainly used to expand one end of a 2m diameter platform to 4m by telescoping, and can rotate 360°. The telescopic platform is installed on the arm head of the third telescopic arm 34 through a flange plate, and is the core component of the working platform. The telescopic platform is mainly composed of a fixed platform (first platform), an extension platform 51 (second platform), an integrated slewing mechanism, a telescopic mechanism and a mounting flange plate. The telescopic platform is mainly driven to extend and retract by an electric motor to drive the rack, and the platform can be rotated by the electric motor in the integrated slewing mechanism. The platform retraction and expansion have mechanical and electrical limits. When the platform is retracted, a latch is set to fix the telescopic platform to prevent the telescopic platform from slipping out during transportation. To facilitate the route, the platform's movements are all controlled by the motor.

[0116] Optionally, in order to reduce the friction resistance when the platform is extended, rollers are added to the upper and lower surfaces of the extension platform 51, and a support block with a universal ball is added to the side to adjust the gear meshing clearance.

[0117] Specifically, the fixed platform body is welded from 40×40×2 square tubes and is divided into two layers. The upper layer is paved with patterned aluminum plates for the workers to stand on, and the lower layer is connected to the integrated slewing mechanism, with a telescopic platform in the middle. There is a guardrail on the top, and the height of the guardrail is 1100mm.

[0118] Fig.15 and Fig.16 They are respectively a side view and a top view of the extension platform 51 provided in an embodiment of the present invention. Fig.15 and 16As shown, the main body of the extension platform 51 is welded from 40×40×2 square tubes, and the bottom contains a skateboard platform whose main function is to fill the gap between the extension platform 51 and the fixed platform after the extension platform 51 is extended. The main body of the skateboard platform is welded from 20×20×2 square tubes, and can be extended and retracted at the bottom of the extension platform 51 as the telescopic platform is extended and retracted.

[0119] Preferably, the telescopic mechanism is mainly composed of an electric rotary reducer and a rack, which mainly completes the telescopic function of the telescopic platform. The electric rotary reducer is installed on the fixed platform, and the rack is installed on the side of the telescopic platform. The voltage of the electric rotary reducer is 24v, the power is 150w, the speed is 10r / min, the output torque is 70Nm, the pinion module m=5, and the number of teeth Z=12.

[0120] Fig.17 , Fig.18 and Fig.19 They are respectively a top view, a side view and a retracted side view of the lower platform assembly 6 provided in an embodiment of the present invention. Fig.17 , Fig.18 and Fig.19 As shown, the lower platform assembly 6 is mainly used to expand from an approximate circle with a diameter of 2m to an approximate circle with a diameter of 4m. It is installed on the arm head of the fourth telescopic arm 35 and is the core component of the working platform. The lower platform assembly 6 is mainly composed of a first flap, a second flap, a connecting rod 1, a connecting rod 2, a sliding assembly, a base platform, etc. The bottom of the lower platform contains a flange that can be connected to the cross support cylinder assembly 7. The unfolding principle is: the universal oil cylinder drives the sliding assembly to translate, and then drives the connecting rod 1 and the connecting rod 2 to move while driving the first flap and the second flap to rotate horizontally along the hinge axis. The outer fence begins to fold on the first flap and the second flap. After unfolding, the fence is manually rotated vertically, and then the middle gap is surrounded by a chain.

[0121] Specifically, a nearly circular platform is formed by welding 40×40×2 square tubes above the base platform, a support connecting the first and second flip plates is welded at the bottom of the platform, and an arm structure is welded below with upper and lower bent plates. The cross-section of the arm is octagonal, and slats are welded at the movement of the slider, which can be milled to ensure the straightness of the sliding platform when it is extended or retracted.

[0122] Optionally, the inner side of the sliding component is an arm structure formed by welding upper and lower bent plates, the cross-section of the arm is an octagon, and the outer side is a nearly circular 16-sided box structure, and the sides of the 16-sided structure are respectively welded with supports for connecting rods.

[0123] Specifically, the first and second remakes are both welded from 40×40×2 square tubes, and the lower parts are both welded with supports connected to the base platform and the connecting rod.

[0124] Preferably, the expansion cylinder mainly completes the linear motion of the sliding assembly, thereby completing the expansion of the platform. The cylinder diameter of the expansion cylinder is 63mm, the rod diameter is 45mm, and the stroke is 630mm.

[0125] Fig. 20 and Fig.21 They are respectively a top view and a side view of the cross support cylinder assembly 7 provided in an embodiment of the present invention, as shown Fig. 20 and Fig.21 As shown, the cross support cylinder assembly 7 is mainly composed of a mounting plate, a cross support cylinder and a universal ball. Its main function is to unfold the cross support cylinder to support the cylinder wall after the platform is inserted into place to prevent the arm from shaking. A universal ball is installed at the tail of the cross support cylinder to prevent the cross support cylinder rod from being damaged due to the arm sliding off. The cross support cylinder assembly 7 is installed at the bottom of the lower platform. The cross support cylinder is installed at the tail of the lower platform assembly 6 by four electric cylinders.

[0126] Optionally, the cross support cylinder adopts an electric multi-stage cylinder with a voltage of 24V, a power of 300W, a thrust of 100KG, and self-locking.

[0127] As an optional implementation, the hydraulic system is composed of power elements, actuators, control elements, auxiliary elements, etc. The function of the power element is to convert the mechanical energy of the prime mover into the pressure energy of the hydraulic oil, which refers to the oil pump in the hydraulic system, which provides power to the entire hydraulic system. The control element includes various control devices (i.e. various valves and locks) to control and adjust the pressure, flow and direction of the liquid in the hydraulic system. It contains multi-way valves, balancing valves, two-way hydraulic locks, etc.; the multi-way valve includes a multi-way valve for controlling the movement of the outriggers and getting on the vehicle, the outrigger valve is 7-way, and the getting on vehicle valve is 6-way. The auxiliary elements include a hydraulic oil tank 11, oil pipes and pipe joints, filters, hose reels, drag chains, etc. Fig. 22 Schematic diagram of the hydraulic oil tank 11 provided in an embodiment of the present invention, as shown Fig. 22 As shown, the hydraulic oil tank 11 uses SQZ4500B hydraulic oil tank 11, and the diameter of the hose reel is 800mm. The rated pressure of the hydraulic system is 25MPa, and the flow rate is 40L / min. The function of the actuator is to convert the pressure energy of the liquid into mechanical energy.

[0128] Preferably, the electrical control system also includes a main controller module and a sensor module, an intercom module, a monitoring module and a lighting module connected to the main controller module; the sensor module is used to collect oil pressure signals, angle signals, chassis inclination signals and oxygen concentration signals and send them to the main controller module; the intercom module is used to transmit the voice of the staff; the monitoring module is used to display the real-time image information of the staff; and the lighting module is used to illuminate the working area.

[0129] Specifically, the electrical control system has the following functions:

[0130] (1) Power mode switching function

[0131] The electric control system has two modes: self-contained power supply and external power supply. The self-contained power supply directly uses the 24V battery of the vehicle, and the external power supply can be connected to the mains through a 220v to 24v power module.

[0132] (2) Operation interlock function

[0133] In order to prevent staff from misoperation, an interlocking function is designed between the main console and the workbench 1 console and the workbench 2 console (the workbench 1 console and the workbench 2 console can be operated at the same time). When one is selected as the main control, the operation of the other will be prohibited. This function is realized by a selection switch signal.

[0134] (3) Action interlock function

[0135] 1) The outrigger action is interlocked with the vehicle boarding action

[0136] It is forbidden to move on the vehicle unless the outriggers are in place.

[0137] 2) The telescopic boom luffing action is interlocked with the working platform action

[0138] The telescopic arm must be adjusted to vertical length to operate the telescopic arm extension and retraction, the extension and unfolding of platform 1 and platform 2, and the extension and retraction of the cross support cylinder.

[0139] 3) Cross support cylinder and telescopic arm telescopic interlocking

[0140] Extension and retraction of the telescopic arm is not allowed after the cross support cylinder is in place.

[0141] (4) Remote on / off function

[0142] A remote start and stop button is provided on the upper platform, which can remotely control the delayed start and shutdown of the chassis engine.

[0143] (5) Emergency stop function

[0144] The main console for getting off the vehicle, the upper platform console and the lower platform remote control are all equipped with emergency stop switches. When any one of them is clicked, all actions will stop.

[0145] (6) Enforcement function

[0146] The main console for getting off the vehicle, the console for workbench 1 and the console for workbench 2 are all equipped with a "forced" button. Pressing the forced button allows the boom to be retracted. Pressing the forced switch can only be operated for 30 seconds, and the buzzer will continue to sound. If you want to continue the forced operation, you need to reset the forced switch and then press it again.

[0147] (7) Lighting function

[0148] Lighting lamps are installed on both the upper platform and the lower platform to realize the lighting function during operation.

[0149] (8) The boom can be unfolded to the vertical position with one click

[0150] The vertical angle of the boom is detected by sensors. A series of amplitude changes are controlled by the controller program to achieve the effect of one-key extension and retraction of the boom.

[0151] The sequence of unfolding action is: luffing cylinder 1 is extended to the right position, and luffing cylinder 2 cooperates with the boom angle sensor to adjust the boom angle. Finally, it is perpendicular to the ground. The sequence of retracting action is the opposite.

[0152] (9) One-touch extension and retraction of outriggers

[0153] Proximity switch sensors are used to detect whether the horizontal outriggers and swing outriggers are fully extended or retracted, oil pressure sensors are used to monitor whether the vertical outriggers are supporting the ground, and chassis inclination sensors are used to detect whether the vehicle body is level. A series of outrigger actions are then controlled through the controller program to achieve the effect of one-click extension, retraction and leveling of the outriggers.

[0154] (10) Oxygen concentration monitoring function

[0155] An oxygen concentration monitor is installed at the bottom of the lower platform. If the oxygen concentration is detected to be too low, the boom will be stopped from continuing to descend and an alarm will be sounded.

[0156] (11) Electronic control function

[0157] Electric control consoles are installed at the getting off, getting on and upper platforms, and the lower platform is remotely controlled.

[0158] (12) Image transmission function

[0159] A monitoring display is set in the cab, and cameras are set on the upper platform and the lower platform respectively, so as to monitor the situation of the upper platform and the lower platform in real time. The monitoring display is provided with an external interface, which can be connected to the monitoring room for monitoring.

[0160] (13) Intercom function

[0161] Intercoms are installed in the cab, upper platform and lower platform. The upper platform is the main intercom, and the cab and lower platform are auxiliary intercoms. The main intercom can communicate with the auxiliary intercom, but the two auxiliary intercoms cannot communicate with each other.

[0162] In this embodiment, the whole vehicle is mainly composed of the Sinotruk HOWO 6X4 chassis, the telescopic arm assembly 3, the sliding platform assembly 4, the upper platform assembly 5, the lower platform assembly 6, the cross support cylinder assembly 7, the outrigger assembly, the hydraulic system, the cover assembly 10, the electrical control system, the subframe 2 and the hydraulic oil tank 11. The subframe 2 is fixed to the HOWO chassis by bolts; the hydraulic oil tank 11 is arranged at the front end of the subframe 2 and is connected to the bracket by bolts; the covering parts mainly include: a walkway, a ladder, a front tool box, and a rear tool box. The walkway covers the front half of the subframe 2 and is connected to the subframe 2 by bolts. The ladder is arranged at the rear position of the front outrigger on the driver's side and is connected to the subframe 2 by bolts. The front tool box is arranged behind the hydraulic oil tank 11 on the co-pilot side and is fixed to the subframe 2 by bolts. The rear tool box is arranged at the rear side of the subframe 2 and is connected to the subframe 2 by bolts; the electrical control system is arranged behind the hydraulic oil tank 11 on the driver's side and at a position corresponding to the front tool box, and is fixed to the subframe 2 by bolts; the outrigger assembly is mainly composed of a front vertical outrigger cylinder 8 and a rear swing outrigger assembly 9. The front vertical outrigger cylinder 8 is installed in the middle and front position of the subframe 2 by bolts, and the two sides are arranged symmetrically. The leg assembly 9 is symmetrically installed at the rear of the sub-frame 2 and is connected to the sub-frame 2 through an axle pin; the sliding platform assembly 4 is inserted into the slide rail groove from the rear end of the sub-frame 2 and connected to the sub-frame 2, one end of the lower sliding cylinder is connected to the sliding platform through an axle pin, and the other end is connected to the sub-frame 2 through an axle pin; the telescopic arm assembly 3 is mainly composed of a basic arm 31, a first telescopic arm 32, a second telescopic arm 33, a third telescopic arm 34, and a fourth telescopic arm 35. The basic arm 31 is connected to the sliding platform parallelogram mechanism through a hinge shaft at the lower end hinge point, and the middle and upper sections are connected to two second variable-length cylinders symmetrically arranged on the sliding platform through axle pins, which mainly complete the variable-length erection function of the telescopic arm assembly 3; the upper platform assembly 5 is mainly composed of a fixed platform, a telescopic platform, an integrated slewing mechanism, a telescopic mechanism and an installation flange plate, which is fixed to the arm head of the third telescopic arm 34 with bolts through a flange plate, and is the core component of the working platform. The telescopic platform is mainly extended and retracted by an electric motor driving the rack, and the platform can be rotated by the electric motor in the integrated rotating mechanism; the lower platform assembly 6 is mainly composed of a first flap, a second flap, a connecting rod 1, a connecting rod 2, a sliding component, a base platform, an expansion cylinder, etc., and is the core component of the working platform. The base platform is mounted on the flange plate at the head of the fourth telescopic arm 35 by bolts; the cross support cylinder assembly 7 is connected to the flange at the bottom of the lower platform by bolts, thereby realizing the installation of the downward-probing working platform.

[0163] In this embodiment, the deployment of the downward working platform can be mainly divided into the following stages: 1. Vehicle parking stage; 2. Outrigger support stage; 3. Boom erection stage; 4. Personnel entering the platform stage; 5. Boom vertical downward stage; 6. Cross support cylinder support stage. The withdrawal process after the operation is completed is opposite to the deployment process and will not be introduced.

[0164] (1) Park the vehicle in front of the pit entrance with the rear of the vehicle facing the center line of the pit entrance.

[0165] (2) Outrigger support stage: After the vehicle is parked, the front outriggers and swing outriggers are deployed and supported on the ground. The vehicle is leveled using the vertical outriggers to adjust the upper plane to a horizontal state.

[0166] (3) Boom erection stage: After the vehicle is leveled, the sliding platform is controlled to slide to the rear end of the vehicle. After the sliding is completed, press the button on the control panel to unfold it to the vertical position, and the sliding platform can be moved to the middle of the foundation pit.

[0167] (4) Personnel entering the platform stage: After moving to the middle of the foundation pit, the lower platform is lowered to be flush with the pit mouth, the lower platform is unfolded, personnel enter the lower platform, and the guardrails of the lower platform are erected. The gaps between the guardrails are sealed with chains, and then personnel enter the upper platform.

[0168] (5) Vertical downward extension of the boom: After personnel enter, they operate the boom to vertically extend to the working position and extend the upper platform.

[0169] (6) Cross support cylinder support stage: Operate the cross support cylinder at the bottom to extend and support the arm inside the cylinder. After completion, personnel can carry out related operations.

[0170] The calculation results of the working hours of each actuator are shown in Table 2.

[0171] Table 2

[0172]

[0173] The beneficial effects of the present invention are as follows:

[0174] (1) Due to the double-layer platform layout of the present invention, if the hinge point is arranged very high, it will be too high; if the hinge point is arranged very low, the cross support cylinder will be less than 500mm from the ground after the arm is extended vertically. The present invention uses a parallelogram mechanism to lower the parallelogram during vehicle transportation to meet the transportation height requirements, and raise the parallelogram during operation to ensure that the platform is more than 500mm from the ground when erected.

[0175] (2) The upper platform assembly of the present invention is installed on the third telescopic arm head, and the lower platform assembly is arranged on the fourth telescopic arm head. In order to realize independent telescopic extension, the telescopic extension of the upper platform is realized by a twin telescopic cylinder plus a chain zipper, and the telescopic extension of the lower platform is realized by a single telescopic cylinder.

[0176] (3) The present invention adopts a method of arranging a drag chain and a winding pipe inside the arm body, so as to independently arrange a pipeline to the fourth telescopic cylinder, thereby realizing the independent control function of the fourth telescopic cylinder.

[0177] (4) The upper platform assembly of the present invention needs to rotate 360 ​​degrees, and the pipelines and lines of the lower platform assembly need to pass through the upper platform, which brings difficulties to the layout of the pipelines and lines of the lower platform. The present invention increases the diameter of the rotating mechanism of the upper platform assembly, and opens a hole in the flange plate on the third telescopic arm to use a hose reel and a wire reel to lead the pipelines and lines to the lower platform assembly, thereby achieving the functions of flexible wiring and increased working range.

[0178] (5) The present invention mainly drives the telescopic platform to extend and retract by driving the rack through an electric motor, and can drive the platform to rotate through the electric motor in the integrated rotating mechanism, thereby realizing the function of the upper platform assembly extending from a platform with a diameter of 2m to 4m at one end through telescoping, and being able to rotate 360°.

[0179] (6) The present invention drives the sliding assembly to translate by means of an oil cylinder, thereby driving the connecting rods 1 and 2 to move and driving the first flap and the second flap to rotate horizontally along the hinge axis, thereby realizing the function of expanding the lower platform assembly from an approximate circle with a diameter of 2m to an approximate circle with a diameter of 4m.

[0180] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0181] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A downward-probing work platform, characterized in that: include: A support connecting member assembly and a telescopic arm assembly, a sliding platform assembly, a working platform assembly and an electrical control system arranged on the support connecting member assembly; the electrical control system is respectively connected to the telescopic arm assembly, the sliding platform assembly and the working platform assembly; The working platform assembly is a double-layer platform, including an upper platform assembly and a lower platform assembly; The upper platform assembly includes a telescopic platform; the telescopic platform is connected to the arm head of any one of the 2nd to n-1th telescopic arms; The lower platform assembly includes a base platform and a plurality of flaps arranged at the bottom of the base platform; the base platform is connected to the arm head of the nth telescopic arm; The sliding platform assembly comprises: a sliding platform and a parallelogram mechanism, the sliding platform is movably connected to the supporting connecting member assembly, the parallelogram mechanism comprises a first vertical beam, a second vertical beam, a cross beam and a parallelogram support, the parallelogram support is arranged on the sliding platform, one end of the first vertical beam and one end of the second vertical beam are hinged to the parallelogram support, and the other end of the first vertical beam and the other end of the second vertical beam are hinged to the cross beam; The telescopic arm assembly comprises n telescopic arms nested in sequence from the outside to the inside; the outermost telescopic arm is the first telescopic arm, and the innermost telescopic arm is the nth telescopic arm; the first telescopic arm is hinged to the crossbeam; any two telescopic arms from the second to the n-1th telescopic arms are connected in sequence by an extension cable chain and a retraction cable chain; The working platform assembly is connected to the telescopic arm assembly, and the working platform includes a telescopic platform and a flap; The electrical control system is used to drive the sliding platform to slide on the supporting connector assembly, drive the parallelogram mechanism to deform, control the telescopic arm assembly to extend and retract, control the telescopic platform to extend and retract, and control the flap to extend and retract; The electrical control system includes a hydraulic system and a motor drive system; The hydraulic system comprises: a sliding cylinder, a first luffing cylinder, a second luffing cylinder, a multiple telescopic cylinder, a single telescopic cylinder and an expansion cylinder; One end of the sliding cylinder is connected to the sliding platform, and the other end of the sliding cylinder is connected to the sub-frame, and the sliding cylinder is used to drive the sliding platform to slide on the supporting connecting member assembly; One end of the first luffing oil cylinder is connected to the parallelogram support, and the other end of the first luffing oil cylinder is connected to the first vertical beam, and the first luffing oil cylinder is used to drive the parallelogram mechanism to deform; The second luffing cylinder includes a first single-cylinder luffing cylinder and a second single-cylinder luffing cylinder; the first single-cylinder luffing cylinder and the second single-cylinder luffing cylinder are symmetrically arranged on the parallelogram support, one end of the first single-cylinder luffing cylinder and one end of the second single-cylinder luffing cylinder are both connected to the first telescopic arm, and the second luffing cylinder is used to drive the upper platform assembly and the lower platform assembly to rise and fall in the vertical direction; The multiple telescopic cylinders include a plurality of telescopic cylinders; the telescopic cylinders are connected to the second to the n-1th telescopic arms and one telescopic cylinder is correspondingly connected to one telescopic arm; the telescopic cylinders are used to drive the telescopic arms to extend and retract; The single telescopic cylinder is connected to the nth telescopic arm, and is used to drive the nth telescopic arm to telescope; the single telescopic cylinder is controlled by a first multi-way valve; the multiple telescopic cylinders are controlled by a second multi-way valve; The lower platform assembly also includes a sliding assembly; the base platform is connected to the deployment cylinder through the sliding assembly, and the deployment cylinder is used to drive the flap to be deployed and recovered; The motor drive system includes: an electric rotary reducer and a motor, wherein the electric rotary reducer drives the telescopic platform to extend and retract through a rack; the motor completes the rotation of the telescopic platform through a worm gear rotary mechanism; The described downward-reaching work platform further includes a cross-support cylinder assembly; The cross support cylinder assembly is arranged at the bottom of the lower platform, and the cross support cylinder assembly includes a mounting plate, a cross support cylinder and a universal roller ball; the cross support cylinder is fixed to the bottom surface of the mounting plate, and the cross support cylinder is used to support the telescopic arm assembly; the universal roller ball is arranged at the tail of the cross support cylinder.

2. The downward-reaching work platform according to claim 1, characterized in that: Also included are a plurality of front vertical outrigger cylinders and a plurality of rear swing outrigger assemblies; A plurality of front vertical leg oil cylinders are symmetrically fixed on the fixed legs on the left and right sides of the support connecting member assembly, and the front vertical leg oil cylinders are used to support the front part of the support connecting member assembly; The rear swing leg assembly includes a rear swing leg oil cylinder, a rear vertical leg oil cylinder, a rear swing leg and a connecting rod mechanism; A plurality of rear swing legs are symmetrically hinged on the fixed legs on the left and right sides of the support connecting member assembly; the rear vertical leg cylinder is arranged on the rear swing leg, and the rear vertical leg is used to support the rear part of the support connecting member assembly; one end of the connecting rod mechanism and one end of the rear swing leg cylinder are connected to the rear swing leg; the other end of the connecting rod mechanism is connected to the other end of the rear swing leg cylinder; the rear swing leg cylinder is used to control the swing of the rear swing leg.

3. The downward-reaching work platform according to claim 1, characterized in that: Also included is a cover assembly; The cover assembly is arranged on the support connector assembly, and the cover assembly includes a tool box, a walkway, a fender and a ladder; The mudguard is arranged at the front wheel of the support connecting member assembly; the walkway cover is arranged on the surface of the support connecting member assembly; the tool box is fixed to the support connecting member assembly by bolts; the ladder is arranged on one side of the support connecting member assembly, and the ladder is connected to the support connecting member assembly.

4. The downward-reaching work platform according to claim 1, characterized in that: A through hole is arranged on the flange plate on the n-1th telescopic arm, and a hose reel and a cable reel are also arranged at the through hole; the pipeline of the lower platform passes through the hose reel and the cable reel and enters the through hole.

5. The downward-reaching work platform according to claim 1, characterized in that: The telescopic platform includes a first platform and a second platform; the first platform is fixedly arranged on the arm head of any one of the 2nd to n-1th telescopic arms, and the first platform is movably connected to the second platform through the rack and the worm gear slewing mechanism; the electric rotary reducer is arranged on the first platform, the motor is connected to the worm gear slewing mechanism, and the rack is arranged on both sides of the telescopic platform; the electric rotary reducer is arranged in contact with the rack.

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