Multi-stage telescopic platform mechanism for trestle

Abstract

The invention belongs to the field of aviation process equipment, and discloses a multi-stage telescopic platform mechanism for a trestle. Comprising a basic frame, a first-stage telescopic platform, lock catches and a second-stage telescopic platform. Wherein the first-stage telescopic platform is used for meeting the depth requirement, and the second-stage telescopic platform is in a multi-column telescopic mode so as to meet the complete shape following requirement and adapt to the change of various states. According to the multi-stage telescopic platform for the trestle, the requirement for the large depth is met, and the multi-column telescopic mode designed through the two-stage telescopic platform meets the requirement for complete shape following and adapts to changes of various states. And the hand-retracting stretching efficiency is high, the price is low, the stretching length is controllable, and self-locking is reliable.

Description

Technical Field

[0001] The present invention belongs to the field of aviation process equipment, and discloses a multi-stage telescopic platform mechanism for a trestle bridge. Background Art

[0002] During the aircraft assembly process, assembly tooling and under-frame tooling are required to implement the process from parts to components. Such tooling is relatively tall, which requires corresponding trestle bridges and working ladders to be matched. Workers stand on the platforms of the trestle bridges and working ladders to complete the assembly and riveting of products.

[0003] There are many locators and clamps on the assembly tooling for positioning and clamping product parts. The locators and clamps have a relatively long depth, small gaps between them, and most locators and clamps need to move in the X, Y, and Z directions. When configuring the trestle bridge, neither the conventional flap nor the telescopic platform can completely avoid and fill the gaps, posing a risk of workers stepping into the air during high-altitude operations.

[0004] The length of the conventional flap generally does not exceed 500 mm. If it is longer, there will be problems such as being too heavy to flip and insufficient strength; and the follow-shaped notch at the front end of the flap is only applicable to one state and cannot be used as long as the locators and clamps move in the X, Y, and Z directions.

[0005] The conventional telescopic platform is relatively wide, generally ranging from 400 mm to 1200 mm, and cannot extend into smaller gaps; if it is made according to the gap size, there is also a problem that the follow-shaped notch is only applicable to one state and cannot be used as long as the locators and clamps move in the X, Y, and Z directions.

[0006] In view of the above problems, it is necessary to study a telescopic platform mechanism that can be controllably telescoped, self-locked at any position, and is safe and convenient for workers to operate, and is equipped with a movable trestle bridge and working ladder to achieve aircraft assembly. Summary of the Invention

[0007] To solve the above problems, the present invention provides a multi-stage telescopic platform mechanism for a trestle bridge, which is applied to the trestle step mechanism used for high-altitude operations during the aircraft assembly process. The first-stage telescoping is used to meet the depth requirements, and the second-stage telescoping is designed in a multi-column telescoping form using the differential principle to meet full follow-shaped and adapt to various state changes. Manual contraction and stretching have high efficiency and low price; it can achieve a telescopic stroke of up to 2500 mm, with controllable telescopic length and reliable self-locking.

[0008] According to one aspect of the present application, a multi-stage telescopic platform mechanism for a trestle bridge is provided, including a basic frame 100, a first-stage telescopic platform 200, a lock 300, and a second-stage telescopic platform 400;

[0009] Among them, the first-level telescopic platform 200 is used to meet the depth requirement, and the second-level telescopic platform 400 is of a multi-column telescopic form to meet full conformity and adapt to various state changes.

[0010] The base frame 100 serves as a fixed platform and is composed of a C-profile right 101, a C-profile left 102, a rear end plate 103, an angle plate 104, a connecting plate 105, a deck plate 106, a plug pin 107, a screw 108, a slider 109, and a chain 110.

[0011] The C-profile right 101 has a C-shaped structure, and 16 M6 threaded holes are machined on the upper end face for connecting the deck plate 106;

[0012] Four Φ8.5mm counterbored holes are machined on the lower end face of the C-profile right 101 for connecting the connecting plate 105;

[0013] One Φ6.5mm counterbored hole is machined on the front surface of the C-profile right 101 for connecting the angle plate 104;

[0014] The C-profile left 102 is symmetrical to the C-profile right 101, with the same structure and function, and both have C-shaped grooves;

[0015] The left and right ends of the rear end plate 103 are respectively inserted into the C-shaped grooves of the C-profile left 102 and the C-profile right 101;

[0016] Two Φ6.5mm counterbored holes are machined on the front surface of the rear end plate 103 for connecting the angle plate 104;

[0017] The angle plate 104 has an L-shaped structure, and one M6 threaded hole is machined on each of the two right-angled surfaces for connecting the C-profile right 101, the C-profile left 102, and the rear end plate 103;

[0018] Eight Φ6.5mm counterbored holes are machined on the front surface of the connecting plate 105 for connecting the slider 109;

[0019] Four M8 threaded holes are machined on the connecting plate 105 for connecting to the C-profile right 101 and the C-profile left 102, which not only serves for transitional connection but also plays a role in strengthening the strength of the overall base frame.

[0020] Thirty-two Φ6.5mm counterbored holes are machined on the front surface of the deck plate 106 for connecting to the C-profile right 101 and the C-profile left 102;

[0021] One end of the deck plate 106 is provided with a notch for avoiding the plug pin 107, the screw 108, and the chain 110;

[0022] The plug pin 107 is a stepped pin, and a round hole is machined for connecting the chain 110;

[0023] The screw 108 is a slotted screw, with a round hole for connecting the chain 110;

[0024] The screw 108 has threads for screwing into the left C-profile 102 to fix the chain 110.

[0025] The first-stage telescopic platform 200 is used for telescoping within the basic frame 100, and is composed of a platform 201, end baffles 202, angle seats 203, guide wheels 205, guide rails 204, and handles 206.

[0026] The platform 201 is welded by cold-drawn tubes 2011, deck plates 2012, guide rail mounting plates 2013, longitudinal reinforcement plates 2014, transverse reinforcement plates 2015, and end plates 2016;

[0027] One end of the cold-drawn tube 2011 has a lower limit notch for installing the lock 300;

[0028] The cold-drawn tube 2011 has an inner opening for guiding the second-stage telescopic platform 400.

[0029] A number of 6*9 oblong holes are equidistantly made on the deck plate 2012 to cooperate with the pins 107 for the extension limit of the first-stage telescopic platform 200;

[0030] The deck plate 2012 has 1 square hole for the avoidance of the latch handle in the lock 300;

[0031] The deck plate 2012 has 2 long slots, and each long slot has 2 M4 threaded holes for installing the guide wheels 205;

[0032] The long slot end of the deck plate 2012 has 2 M6 threaded holes for installing the end baffles 202;

[0033] The deck plate 2012 has 6 groups, with 3 M5 threaded holes in each group, for installing the handles 206;

[0034] The square hole end of the deck plate 2012 has 6 M6 threaded holes for installing the lock 300;

[0035] The longitudinal reinforcement plates 2014 and transverse reinforcement plates 2015 are welded to the lower surfaces of 4 cold-drawn tubes 2011 for strengthening;

[0036] The longitudinal reinforcement plate 2014 has 4 M6 threaded holes for installing the angle seats 203;

[0037] The guide rail mounting plate 2013 is welded to the longitudinal reinforcement plate 2014, and has M6 threaded holes made according to the Φ6.5mm countersunk holes on the guide rail 204 for connecting the guide rail 204;

[0038] The plugging plate 2016 is welded to the inner end face of the cold-drawn tube 2011 and is provided with a Φ6.5mm through-hole for connecting the end baffle plate 202.

[0039] The end baffle plate 202 has an L-shaped structure. Notches are made on both sides of the short side to avoid the guide wheels 205. Two Φ6.2mm counterbored holes are made on the short side surface for connecting to the laying plate 2012. Four Φ6.5mm through-holes are made on the long side surface for connecting to the plugging plate 2016.

[0040] The angle seat 203 has an L-shaped structure. Two Φ6.5mm through-holes are made on the long side surface for connecting to the longitudinal reinforcement plate 2014. When the first-stage telescopic platform 200 extends to the limit position, it is stuck on the slider 109 to prevent falling off.

[0041] The guide wheel 205 is composed of a support 2051, a nylon wheel 2052, a shaft 2053, a bearing 2054, and a snap ring 2055. It contacts the laying plate 106 and cooperates with the sliding pair composed of the slider 109 and the guide rail 204 to control the up-and-down limit when the first-stage telescopic platform 200 slides in the basic frame 100.

[0042] The support 2051 has a U-shaped structure. Two Φ4.2mm through-holes are made on the bottom surface for connecting to the laying plate 2012.

[0043] Two Φ5mm precision holes are made on the two vertical surfaces of the support 2051 for installing the shaft 2053.

[0044] Bearing holes are made at both ends of the nylon wheel 2052 for installing the bearing 2054.

[0045] Circular grooves are made on the columnar surfaces at both ends of the shaft 2053 for installing the snap ring 2055.

[0046] Install the bearing 2054 on the nylon wheel 2052, connect it to the support 2051 with the shaft 2053, and clamp it tightly on the support 2051 with the snap ring 2055.

[0047] The lock 300 is used to lock the second-stage telescopic platform 400 at any position when it telescopes in the first-stage telescopic platform 200. According to the cam locking principle, it is composed of a left buckle plate 301, a right buckle plate 302, a limit plate 303, a camshaft 304, a handle 305, a top plate 306, an end plate 307, and a ball head plunger 308.

[0048] A chamfer is made on the front surface of the left buckle plate 301 for slow movement. Three Φ6.2mm counterbored holes are made for connecting to the laying plate 2012. Two Φ7mm through-holes are made for the ball head plunger 308 to pass through when screwing into the camshaft.

[0049] On the back of the left buckle plate 301, a non-through slot is transversely made for installing the camshaft 304, two short slots are made for avoiding the shaft section of the ball head plunger when the camshaft is flipped, and a non-through slot is longitudinally made for installing the limit plate 303;

[0050] On the upper end face of the left buckle plate 301, three M6 threaded holes are made for connecting the end plate 307;

[0051] On the right side face of the left buckle plate 301, one M6 threaded hole is made for screwing in the set screw. The bottom surface of the vertical surface is flush with the bottom surface of the limit plate 303 and abuts against the lower limit notch surface of the cold drawn tube 2011;

[0052] The right buckle plate 302 is symmetrical to the left buckle plate 301 and has the same structural functions;

[0053] One set screw is screwed into the outer side face of each of the left buckle plate 301 and the right buckle plate 302. The two set screws abut against the end face of the camshaft 304 for adjusting the left and right positions of the camshaft 304 in the left buckle plate 301 and the right buckle plate 302, so that the shaft section of the ball head plunger 308 can enter the two short slots transversely when the camshaft 304 rotates, and for adjusting the up and down positions of the camshaft 304 in the left buckle plate 301 and the right buckle plate 302, so that when the cam locking surface between the cam cylindrical surface of the camshaft 304 and the transverse long slot fits, the locking limit surface of the limit plate 303 abuts against the end plate 307 to lock;

[0054] The limit plate 303 is made with precision holes that match the shaft diameter of the camshaft 304. The camshaft 304 is inserted into two sets of limit plates 303 and installed in the longitudinal notches of the left buckle plate 301 and the right buckle plate 302;

[0055] When the camshaft 304 is in the locked state, its locking limit surface closely adheres to the end plate 307; when the handle 305 is lifted upward to drive the camshaft to rotate, at this time the camshaft is in the locked state and its locking limit surface disengages from the end plate;

[0056] The two perpendicular directions of the camshaft 304 are milled flat. The section that cooperates with the limit plate 303 is a complete circle. The section for installing the ball head plunger 308 is milled with a single flat. The non-flat cylindrical surface is used as the cam locking surface, and the flat surface is used as the cam relaxation surface and the avoidance surface;

[0057] The camshaft 304 is made with four M8 threaded holes for installing the ball head plunger 308. When in the locked state, the ball head of the ball head plunger is vertically downward and clamped in the triangular groove of the secondary telescopic platform 400 to lock the secondary telescopic platform;

[0058] The camshaft 304 is made with two M4 threaded holes for installing the handle 305;

[0059] The handle 305 is made with two Φ4.2mm counterbored holes for installing onto the camshaft 304;

[0060] The top plate 306 is provided with two Φ4.2 mm countersunk holes for mounting on the end plate 307 to enhance the overall rigidity;

[0061] The end plate 307 is provided with two M4 threaded holes for mounting the top plate 306;

[0062] The end plate 307 is formed with 6 Φ6.5 mm countersunk holes for connecting the left buckle plate 301 and the right buckle plate 302 .

[0063] The secondary telescopic platform 400 is used to telescope within the primary telescopic platform 200 , and is composed of a toothed cold-drawn tube 401 , a blocking plate 402 , a rubber plate 403 , a connecting screw 404 , and a limit screw 405 .

[0064] The toothed cold-drawn tube 401 is provided with a plurality of triangular teeth on its upper surface, and is locked with a lock buckle 300 when extended to any position to prevent shaking when workers walk;

[0065] The lower surface of the toothed cold-drawn tube 401 is provided with an M8 threaded hole, into which a limit screw 405 is screwed and stuck on the end surface of the cold-drawn tube 2011 for limiting position when the limit screw 405 is contracted;

[0066] The blocking plate 402 is welded to the end face of the toothed cold-drawn tube 401 and is provided with two M8 threaded holes for connecting the rubber plate 403;

[0067] The rubber plate 403 is provided with two Φ8.5 mm countersunk holes and is connected to the blocking plate 402 by connecting screws 404 to prevent the product from collision when being extended.

[0068] The right C-profile 101 and the left C-profile 102 are sheet metal parts.

[0069] Compared with the prior art, the advantages of this application are:

[0070] The multi-stage telescopic platform of the trestle described in this application realizes the requirement of large depth, and the multi-column telescopic form designed by the second-stage telescopic platform meets the requirements of full shape and adapting to the changes of various states. The hand-retracted retractable and stretching efficiency is high, the price is low, the telescopic length is controllable, and the self-locking is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 It is a multi-stage telescopic platform for a trestle as described in the present application, wherein a is an extended state and b is a retracted state;

[0072] Figure 2 is a basic frame 100, wherein a is a front view, b is a side view, c is a rear view, and d is a top view;

[0073] Figure 3 It is a C profile right 101, wherein a is a top view, b is a main view, and c is a bottom view;

[0074] Figure 4 is the rear end plate 103, where a is the front view and b is the sectional view;

[0075] Figure 5 is the angle plate 104, where a is the front view, b is the side view, and c is the top view;

[0076] Figure 6 is the connecting plate 105, where a is the front view and b is the sectional view;

[0077] Figure 7 is the deck plate 106, where a is the front view and b is the side view;

[0078] Figure 8 is the dowel pin 107;

[0079] Figure 9 is the screw 108, where a is the front view and b is the top view;

[0080] Figure 10 is the first-stage telescopic platform 200, where a is the top view, b is the side view, c is the front view, and d is the bottom view;

[0081] Figure 11 is the platform 201, where a is the top view, b is the side view, c is the front view, and d is the bottom view;

[0082] Figure 12 is the end baffle 202, where a is the front view, b is the side view, and c is the top view;

[0083] Figure 13 is the angle seat 203, where a is the front view and b is the side view;

[0084] Figure 14 is the guide wheel 205, where a is the front view, b is the sectional view, and c is the top view;

[0085] Figure 15 is the locking buckle 300, where a is the front view, b is the sectional view, c is the sectional view, d is the sectional view, e is the axonometric view, and f is the axonometric view;

[0086] Figure 16 is the left buckle plate 301, where a is the top view, b is the front view, c is the bottom view, d is the rear view, and e is the side view;

[0087] Figure 17 is the limit plate 303, where a is the front view and b is the side view;

[0088] Figure 18 is the camshaft 304, where a is the top view, b is the front view, c is the bottom view, and d is the side view;

[0089] Figure 19 This is the buckle 305, where a is the front view and b is the side view;

[0090] Figure 20 This is the top plate 306, where a is the front view and b is the side view;

[0091] Figure 21 This is the end plate 307, where a is the front view and b is the side view;

[0092] Figure 22 This is the secondary telescopic platform 400, where a is the front view and b is the side view;

[0093] Among them, 100 is the basic frame, 200 is the primary telescopic platform, 300 is the locking buckle, 400 is the secondary telescopic platform, 101 is the C-shaped profile on the right, 102 is the C-shaped profile on the left, 103 is the rear end plate, 104 is the angle plate, 105 is the connecting plate, 106 is the deck plate, 107 is the bolt, 108 is the screw, 109 is the slider, 110 is the chain, 201 is the platform, 2011 is the cold-drawn tube, 2012 is the deck plate, 2013 is the guide rail mounting plate, 2014 is the longitudinal reinforcement plate, 2015 is the transverse reinforcement plate, 2016 is the blanking plate, 202 is the end baffle, 203 is the angle seat, 204 is the guide rail, 205 is the guide wheel, 2051 is the support, 2052 is the nylon wheel, 2053 is the shaft, 2054 is the bearing, 2055 is the snap ring, 206 is the handle, 301 is the left buckle plate, 302 is the right buckle plate, 303 is the limit plate, 304 is the camshaft, 305 is the buckle, 306 is the top plate, 307 is the end plate, 308 is the ball head plunger, 401 is the toothed cold-drawn tube, 402 is the blanking plate, 403 is the rubber plate, 404 is the connecting screw, 405 is the limit screw. Specific embodiments

[0094] Device Example 1

[0095] A multi-stage telescopic platform mechanism for a trestle, comprising a basic frame 100, a primary telescopic platform 200, a locking buckle 300, and a secondary telescopic platform 400;

[0096] Among them, the primary telescopic platform 200 is used to meet the depth requirement, and the secondary telescopic platform 400 is in the form of multi-column telescoping to meet full conformability and adapt to various state changes.

[0097] The basic frame 100 serves as a fixed platform and is composed of a C-shaped profile on the right 101, a C-shaped profile on the left 102, a rear end plate 103, an angle plate 104, a connecting plate 105, a deck plate 106, a bolt 107, a screw 108, a slider 109, and a chain 110.

[0098] The C-shaped profile on the right 101 has a C-shaped structure, and 16 M6 threaded holes are machined on the upper end surface for connecting the deck plate 106;

[0099] The lower end surface of the right C-profile 101 is provided with 4 countersunk holes of Φ8.5mm for connecting the connecting plate 105;

[0100] The front surface of the right C-profile 101 is provided with 1 countersunk hole of Φ6.5mm for connecting the angle plate 104;

[0101] The left C-profile 102 is symmetrical to the right C-profile 101, with the same structure and function, and both have C-shaped grooves;

[0102] The left and right ends of the rear end plate 103 are respectively inserted into the C-shaped grooves of the left C-profile 102 and the right C-profile 101;

[0103] The front surface of the rear end plate 103 is provided with 2 countersunk holes of Φ6.5mm for connecting the angle plate 104;

[0104] The angle plate 104 has an L-shaped structure, and each of the two right-angled surfaces is provided with 1 M6 threaded hole for connecting the right C-profile 101, the left C-profile 102, and the rear end plate 103;

[0105] The front surface of the connecting plate 105 is provided with 8 countersunk holes of Φ6.5mm for connecting the slider 109;

[0106] The connecting plate 105 is provided with 4 M8 threaded holes for connecting to the right C-profile 101 and the left C-profile 102, which not only play a role in transition connection but also strengthen the strength of the overall basic frame.

[0107] The front surface of the deck plate 106 is provided with 32 countersunk holes of Φ6.5mm for connecting to the right C-profile 101 and the left C-profile 102;

[0108] One end of the deck plate 106 is provided with a notch for avoiding the plug pin 107, the screw 108, and the chain 110;

[0109] The plug pin 107 is a stepped pin, and is provided with a round hole for connecting the chain 110;

[0110] The screw 108 is a slotted screw, and is provided with a round hole for connecting the chain 110;

[0111] The screw 108 is provided with a thread for screwing into the left C-profile 102 to fix the chain 110.

[0112] The first-level telescopic platform 200 is used for telescoping within the basic frame 100, and is composed of a platform 201, end baffles 202, angle seats 203, guide wheels 205, guide rails 204, and a handle 206.

[0113] The platform 201 is welded by cold-drawn tubes 2011, deck plates 2012, guide rail mounting plates 2013, longitudinal reinforcement plates 2014, transverse reinforcement plates 2015, and end plates 2016;

[0114] One end of the cold-drawn tube 2011 is provided with a lower limit notch for installing the latch 300;

[0115] The cold-drawn tube 2011 is provided with an inner opening for guiding the secondary telescopic platform 400.

[0116] A number of 6*9 oblong holes are equidistantly made on the floor plate 2012 and cooperate with the dowel pin 107 for the extension limit of the primary telescopic platform 200;

[0117] The floor plate 2012 is provided with 1 square hole for the avoidance of the handle in the latch 300;

[0118] The floor plate 2012 is provided with 2 long grooves, and each long groove is provided with 2 M4 threaded holes for installing the guide wheel 205;

[0119] The long groove end of the floor plate 2012 is provided with 2 M6 threaded holes for installing the end baffle 202;

[0120] The floor plate 2012 is provided with 6 groups, and each group has 3 M5 threaded holes for installing the handle 206;

[0121] The square hole end of the floor plate 2012 is provided with 6 M6 threaded holes for installing the latch 300;

[0122] The longitudinal reinforcement plate 2014 and the transverse reinforcement plate 2015 are welded to the lower surface of the 4 cold-drawn tubes 2011 for reinforcement;

[0123] The longitudinal reinforcement plate 2014 is provided with 4 M6 threaded holes for installing the angle seat 203;

[0124] The guide rail mounting plate 2013 is welded to the longitudinal reinforcement plate 2014, and is provided with M6 threaded holes according to the Φ6.5mm countersunk holes on the guide rail 204 for connecting the guide rail 204;

[0125] The plug plate 2016 is welded to the inner opening end face of the cold-drawn tube 2011, and is provided with a Φ6.5mm through hole for connecting the end baffle 202.

[0126] The end baffle 202 has an L-shaped structure, with notches on both sides of the short side for avoiding the guide wheel 205, 2 Φ6.2mm counterbored holes on the short side face for connecting to the floor plate 2012, and 4 Φ6.5mm through holes on the long side face for connecting to the plug plate 2016.

[0127] The angle seat 203 has an L-shaped structure, with 2 Φ6.5mm through holes on the long side face for connecting to the longitudinal reinforcement plate 2014, and is used to be stuck on the slider 109 to prevent falling off when the primary telescopic platform 200 extends to the limit position;

[0128] The guide wheel 205 consists of a support 2051, a nylon wheel 2052, a shaft 2053, bearings 2054, and snap rings 2055. It contacts the laying board 106 and cooperates with the sliding pair formed by the slider 109 and the guide rail 204 to control the up-and-down limit when the first-stage telescopic platform 200 slides within the basic frame 100.

[0129] The support 2051 has a U-shaped structure, and two Φ4.2mm through holes are made on the bottom surface for connection to the laying board 2012.

[0130] Two Φ5mm precision holes are made on the two vertical surfaces of the support 2051 for installing the shaft 2053.

[0131] Bearing holes are made at both ends of the nylon wheel 2052 for installing the bearings 2054.

[0132] Circular grooves are made on the columnar surfaces at both ends of the shaft 2053 for installing the snap rings 2055.

[0133] Install the bearings 2054 on the nylon wheel 2052, connect them to the support 2051 with the shaft 2053, and clamp them tightly on the support 2051 with the snap rings 2055.

[0134] The lock 300 is used to lock the second-stage telescopic platform 400 at any position during its telescoping within the first-stage telescopic platform 200. It consists of a left buckle plate 301, a right buckle plate 302, a limit plate 303, a camshaft 304, a handle 305, a top plate 306, an end plate 307, and a ball head plunger 308.

[0135] The front surface of the left buckle plate 301 is chamfered for slow movement, three Φ6.2mm counterbored holes are made for connection to the laying board 2012, and two Φ7mm through holes are made for the passage of the ball head plunger 308 when screwing into the camshaft.

[0136] A non-through slot is made horizontally on the back surface of the left buckle plate 301 for installing the camshaft 304, two short slots are made for avoiding the shaft section of the ball head plunger when the camshaft flips, and a non-through slot is made longitudinally for installing the limit plate 303.

[0137] Three M6 threaded holes are made on the upper end surface of the left buckle plate 301 for connecting the end plate 307.

[0138] One M6 threaded hole is made on the right side surface of the left buckle plate 301 for screwing in a set screw, and the bottom surface of the vertical surface is flush with the bottom surface of the limit plate 303 and abuts against the lower limit notch surface of the cold-drawn tube 2011.

[0139] The right buckle plate 302 is symmetrical to the left buckle plate 301 and has the same structural functions.

[0140] One setscrew is screwed into the outer side of each of the left clamping plate 301 and the right clamping plate 302, and the two setscrews abut against the end face of the camshaft 304 for adjusting the left - right position of the camshaft 304 in the left clamping plate 301 and the right clamping plate 302, so that when the camshaft 304 rotates, the shaft section where the ball - head plunger 308 is screwed in can enter the two short transverse grooves for adjusting the up - down position of the camshaft 304 in the left clamping plate 301 and the right clamping plate 302. When the cam locking surface between the cam cylindrical surface of the camshaft 304 and the long transverse groove fits, the locking limit surface of the limit plate 303 abuts against the end plate 307 for locking;

[0141] The limit plate 303 is provided with precision holes that match the shaft diameter of the camshaft 304. The camshaft 304 is inserted into two sets of limit plates 303 and installed in the longitudinal notches of the left clamping plate 301 and the right clamping plate 302;

[0142] When the camshaft 304 is in the locked state, its locking limit surface closely adheres to the end plate 307; when the handle 305 is lifted upward, it drives the camshaft to rotate. At this time, the camshaft is in the locked state, and its locking limit surface disengages from the end plate;

[0143] The two perpendicular directions of the camshaft 304 are milled flat. The section that cooperates with the limit plate 303 is a complete circle, the section where the ball - head plunger 308 is installed is milled with a single flat surface, the non - flat cylindrical surface is used as the cam locking surface, and the flat surface is used as the cam relaxation surface and the avoidance surface;

[0144] The camshaft 304 is provided with 4 M8 threaded holes for installing the ball - head plunger 308. When in the locked state, the ball of the ball - head plunger is vertically downward and clamped in the triangular groove of the secondary telescopic platform 400 to lock the secondary telescopic platform;

[0145] The camshaft 304 is provided with 2 M4 threaded holes for installing the handle 305;

[0146] The handle 305 is provided with 2 counter - sunk holes with a diameter of Φ4.2mm for installation on the camshaft 304;

[0147] The top plate 306 is provided with 2 counter - sunk holes with a diameter of Φ4.2mm for installation on the end plate 307, playing a role in strengthening the overall rigidity;

[0148] The end plate 307 is provided with 2 M4 threaded holes for installing the top plate 306;

[0149] The end plate 307 is provided with 6 counter - sunk holes with a diameter of Φ6.5mm for connecting the left clamping plate 301 and the right clamping plate 302.

[0150] The secondary telescopic platform 400 is used for telescoping within the primary telescopic platform 200 and is composed of a toothed cold - drawn tube 401, a plug plate 402, a rubber plate 403, connecting screws 404, and limit screws 405.

[0151] The upper surface of the toothed cold-drawn tube 401 is provided with a number of triangular teeth and is locked by a buckle 300 when extended to any position to prevent shaking when workers walk.

[0152] The lower surface of the toothed cold-drawn tube 401 is provided with one M8 threaded hole. When a limit screw 405 is screwed in, it is stuck at the end face of the cold-drawn tube 2011 for limiting during contraction.

[0153] The plug plate 402 is welded to the end face of the toothed cold-drawn tube 401 and is provided with two M8 threaded holes for connecting the rubber plate 403.

[0154] The rubber plate 403 is provided with two Φ8.5mm countersunk holes and is connected to the plug plate 402 by connecting screws 404 for anti-collision of the product when extended.

[0155] The C-profile right 101 and the C-profile left 102 are sheet metal parts.

[0156] Example 1

[0157] The device described in Device Example 1 is adopted.

[0158] 1. Move the mobile trestle to the designated position at the assembly station or under the rack. At this time, it is in a contracted state.

[0159] 2. Manually pull out the first-stage telescopic platform 200 a certain distance from the assembly tooling and fix it with a bolt 107.

[0160] 3. Lift the handle 305 upward to make multiple groups of toothed cold-drawn tubes 401 in a loose state.

[0161] 4. Manually pull out multiple groups of toothed cold-drawn tubes 401 to fill the working gap and lower the handle 305 to lock the second-stage telescopic platform 400.

Claims

1. A multi-stage telescopic platform mechanism for a trestle, characterized in that: It comprises a basic frame (100), a primary telescopic platform (200), a lock (300) and a secondary telescopic platform (400); The first telescopic platform (200) is used to meet the depth requirement, and the second telescopic platform (400) is a multi-column telescopic form to meet the requirement of full shape-fitting and adapting to changes in various states.

2. The multi-stage telescopic platform mechanism for a trestle according to claim 1, characterized in that: The basic frame (100) serves as a fixed platform and is composed of a right C-shaped material (101), a left C-shaped material (102), a rear end plate (103), an angle plate (104), a connecting plate (105), a decking plate (106), a latch (107), a screw (108), a slider (109), and a chain (110).

3. The multi-stage telescopic platform mechanism for a trestle according to claim 2, characterized in that: The right C-shaped material (101) has a C-shaped structure, and 16 M6 threaded holes are formed on the upper end surface for connecting the decking (106); The lower end surface of the right side (101) of the C-shaped material is provided with four Φ8.5 mm countersunk holes for connecting the connecting plate (105); The right front side of the C-shaped material (101) is provided with a Φ6.5 mm countersunk hole for connecting the angle plate (104); The left C-shaped material (102) is symmetrical to the right C-shaped material (101), has the same structure and function, and both have C-shaped grooves; The left and right ends of the rear end plate (103) are respectively inserted into the C-shaped grooves of the left C-shaped material (102) and the right C-shaped material (101); The front side of the rear end plate (103) is provided with two Φ6.5 mm countersunk holes for connecting the angle plate (104); The angle plate (104) has an L-shaped structure, and two right-angled surfaces are respectively provided with an M6 threaded hole for connecting the right C-shaped material (101), the left C-shaped material (102), and the rear end plate (103); The front side of the connecting plate (105) is provided with 8 Φ6.5 mm countersunk holes for connecting the slider (109); The connecting plate (105) is provided with four M8 threaded holes for connecting to the right C-profile (101) and the left C-profile (102), and serves to enhance the strength of the overall basic frame while being used for transition connection; The front side of the deck board (106) is provided with 32 Φ6.5 mm countersunk holes for connecting to the right C-shaped material (101) and the left C-shaped material (102); One end of the deck board (106) is provided with a notch for avoiding a latch (107), a screw (108) and a chain (110); The latch pin (107) is a stepped pin with a round hole for connecting the chain (110); The screw (108) is a slotted screw with a round hole for connecting the chain (110); The screw (108) is threaded and is used to be screwed into the left C-shaped material (102) to fix the chain (110).

4. The multi-stage telescopic platform mechanism for a trestle according to claim 1, characterized in that: The first-level telescopic platform (200) is used to telescope within the basic frame (100), and is composed of a platform (201), an end baffle (202), a corner seat (203), a guide wheel (205), a guide rail (204), and a handle (206).

5. The multi-stage telescopic platform mechanism for a trestle according to claim 4, characterized in that: The platform (201) is welded from a cold-drawn tube (2011), a decking plate (2012), a guide rail mounting plate (2013), a longitudinal reinforcing plate (2014), a transverse reinforcing plate (2015), and a blocking plate (2016); One end of the cold-drawn tube (2011) is provided with a lower limit notch for installing a lock buckle (300); The cold-drawn tube (2011) is provided with an inner opening for guiding the secondary telescopic platform (400); The deck board (2012) is provided with a plurality of 6*9 oblong holes at equal intervals to cooperate with the latch pin (107) for limiting the extension of the first telescopic platform (200); The floor board (2012) is provided with a square hole for hiding the hand of the lock buckle (300); The deck board (2012) is formed with two long grooves, each of which is formed with two M4 threaded holes for installing the guide wheel (205); The long groove end of the deck board (2012) is formed with two M6 threaded holes for installing the end baffle (202); The deck board (2012) is provided with 6 groups, each group having 3 M5 threaded holes, for installing the handle (206); The square hole end of the deck board (2012) is provided with 6 M6 threaded holes for installing the lock buckle (300); The longitudinal reinforcement plate (2014) and the transverse reinforcement plate (2015) are welded to the lower surfaces of the four cold-drawn tubes (2011) for reinforcement; The longitudinal reinforcing plate (2014) is provided with four M6 threaded holes for mounting the angle seat (203); The guide rail mounting plate (2013) is welded to the longitudinal reinforcing plate (2014), and an M6 threaded hole is formed according to the Φ6.5 mm countersunk hole on the guide rail (204) for connection with the guide rail (204); The blocking plate (2016) is welded to the inner end face of the cold-drawn tube (2011) and is provided with a Φ6.5 mm through hole for connecting the end baffle (202); The end baffle (202) has an L-shaped structure, with notches on both sides of the short side for avoiding the guide wheel (205), two Φ6.2mm countersunk holes on the short side for connecting to the deck (2012), and four Φ6.5mm through holes on the long side for connecting to the blocking plate (2016); The corner seat (203) has an L-shaped structure, and is provided with two Φ6.5 mm through holes on the long side for connecting to the longitudinal reinforcing plate (2014), and is used to be stuck on the slider (109) when the first telescopic platform (200) is extended to the limit position to prevent it from falling off; The guide wheel (205) is composed of a support (2051), a nylon wheel (2052), a shaft (2053), a bearing (2054), and a retaining ring (2055), and is in contact with the deck (106) and cooperates with a sliding pair composed of a slider (109) and a guide rail (204) to control the position limitation of the first telescopic platform (200) in the up and down directions when sliding in the basic frame (100); The support (2051) has a U-shaped structure, and has two Φ4.2mm through holes on the bottom surface for connecting to the decking (2012); The support (2051) has two Φ5mm precision holes on both sides for installing the shaft (2053); The two ends of the nylon wheel (2052) are provided with bearing holes for installing bearings (2054); Annular grooves are formed on the cylindrical surfaces at both ends of the shaft (2053) for installing retaining rings (2055); The bearing (2054) is installed on the nylon wheel (2052), connected to the support (2051) with the shaft (2053), and clamped on the support (2051) with the clamping ring (2055).

6. The multi-stage telescopic platform mechanism for a trestle according to claim 1, characterized in that: The lock buckle (300) is used to lock the secondary telescopic platform (400) at any position when it is telescoped in the primary telescopic platform (200), and is composed of a left buckle plate (301), a right buckle plate (302), a limit plate (303), a cam shaft (304), a buckle hand (305), a top plate (306), an end plate (307), and a ball plunger (308).

7. The multi-stage telescopic platform mechanism for a trestle according to claim 6, characterized in that: The front side of the left buckle plate (301) is chamfered for slow walking, has three Φ6.2mm countersunk holes for connecting to the deck (2012), and has two Φ7mm through holes for the ball plunger (308) to pass through when it is screwed into the camshaft; The back side of the left buckle plate (301) is formed with a non-through-length groove in the transverse direction for installing the camshaft (304), with two short grooves for avoiding the shaft section screwed into the ball plunger when the camshaft is turned over, and with a non-through-length groove in the longitudinal direction for installing the limit plate (303); The upper end surface of the left buckle plate (301) is provided with three M6 threaded holes for connecting with the end plate (307); The right side of the left buckle plate (301) is provided with an M6 threaded hole for screwing in a top screw, and the bottom surface of the vertical surface is flush with the bottom surface of the limit plate (303) and is pressed against the lower limit notch surface of the cold-drawn tube (2011); The right buckle plate (302) is symmetrical to the left buckle plate (301) and has the same structure and function; A top screw is screwed into the outer side surface of the left buckle plate (301) and the right buckle plate (302), and the two top screws are pressed against the end surface of the cam shaft (304), and are used for adjusting the left and right positions of the cam shaft (304) in the left buckle plate (301) and the right buckle plate (302), so that when the cam shaft (304) rotates, the shaft section screwed into the ball head plunger (308) can enter the two transverse short grooves, and are used for adjusting the up and down positions of the cam shaft (304) in the left buckle plate (301) and the right buckle plate (302), so that when the cam cylinder surface of the cam shaft (304) is in contact with the cam locking surface between the transverse long grooves, the locking limit surface of the limit plate (303) is pressed against the end plate (307) to lock; The limiting plates (303) are provided with precision holes matching the axial diameter of the camshaft (304); the camshaft (304) is inserted into the two sets of limiting plates (303) and installed in the longitudinal notches of the left buckle plate (301) and the right buckle plate (302); When the camshaft (304) is in a locked state, its locking limit surface is in close contact with the end plate (307); the buckle (305) is moved upward to drive the camshaft to rotate, and the camshaft is in a locked state at this time, and its locking limit surface is separated from the end plate; The camshaft (304) is milled flat in two vertical directions, the section that matches the limit plate (303) is a full circle, and the section for installing the ball plunger (308) is milled flat, the non-flat cylindrical surface is used as the cam locking surface, and the flat surface is used as the cam loosening surface and avoidance surface; The camshaft (304) is provided with four M8 threaded holes for installing a ball plunger (308). In the locked state, the ball head of the ball plunger is vertically downward and clamped in the triangular groove of the secondary telescopic platform (400) to lock the secondary telescopic platform; The camshaft (304) is provided with two M4 threaded holes for mounting a buckle (305); The buckle (305) is provided with two Φ4.2 mm countersunk holes for mounting on the camshaft (304); The top plate (306) is provided with two Φ4.2 mm countersunk holes for mounting on the end plate (307) to enhance the overall rigidity; The end plate (307) is provided with two M4 threaded holes for mounting the top plate (306); The end plate (307) is provided with 6 Φ6.5 mm countersunk holes for connecting the left buckle plate (301) and the right buckle plate (302).

8. The multi-stage telescopic platform mechanism for a trestle according to claim 1, characterized in that: The secondary telescopic platform (400) is used for telescoping within the primary telescopic platform (200), and is composed of a toothed cold-drawn tube (401), a blocking plate (402), a rubber plate (403), a connecting screw (404), and a limiting screw (405).

9. The multi-stage telescopic platform mechanism for a trestle according to claim 8, characterized in that: The toothed cold-drawn tube (401) is provided with a plurality of triangular teeth on its upper surface, and is locked with a lock buckle (300) when extended to any position, so as to prevent shaking when workers walk; The lower surface of the toothed cold-drawn tube (401) is provided with an M8 threaded hole, into which a limit screw (405) is screwed and clamped on the end surface of the cold-drawn tube (2011) for limiting position when the limit screw (405) is contracted; The blocking plate (402) is welded to the end face of the toothed cold-drawn tube (401) and is provided with two M8 threaded holes for connecting the rubber plate (403); The rubber plate (403) is provided with two Φ8.5 mm countersunk holes and is connected to the blocking plate (402) by connecting screws (404) to prevent the product from collision when being extended.

10. The multi-stage telescopic platform mechanism for a pier according to claim 2, characterized in that: The right C-profile (101) and the left C-profile (102) are sheet metal parts.

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