CN104609334A - Lead screw driving lifting platform with auxiliary raising block - Google Patents

Abstract

The invention relates to a screw driven lifting platform with auxiliary lifting blocks. The lifting platform includes a lower frame, an upper frame, two outer support arms and two inner support arms, and also includes two lifting plates, two push Rod and U-shaped frame, the front sides of the two lifting plates are respectively provided with curved surfaces or slopes, a connecting beam is arranged between the two lifting plates, and the two lifting plates are fixed together, and the bottom of the two lifting plates is respectively set Lifting plate wheel, the lifting plate wheel is in contact with the upper surface of the lower track; two push rods are fixedly connected and arranged at the rear end of the connecting beam, and a connecting plate is arranged between the two push rods to connect; the middle connecting plate of the U-shaped frame There are two shaft holes on the top, the push rod at the front end of the connecting plate is set in the shaft holes, the bottom of the U-shaped frame is provided with lower rollers, and the two sides of the U-shaped frame are respectively provided with hinge points and two inner The lower ends of the support arms are hinged. The invention is not only safe and reliable, but also reduces the driving power and increases the lifting range.

Description

A screw driven lifting platform with auxiliary lifting block

technical field

The invention relates to a lifting platform, in particular to a screw driven lifting platform with auxiliary lifting blocks.

Background technique

The lifting platform is an indispensable basic equipment in the modern machinery industry. At present, the scissor lifting platform driven by the inclined hydraulic cylinder is more mature and has better use effect. However, when the lifting angle is about 10 degrees in actual use, the driving force It is about 3 times of the load, and when the lifting angle reaches 60 degrees, the driving force is close to the load. And the hydraulic oil of the hydraulic mechanism is easy to leak, and the lifting platform is not easy to keep in the same position for a long time. The traditional horizontal screw scissors lift table is driven by the screw rod directly pulling the horizontal movable end of the shear arm. When the angle between the scissor arm and the horizontal plane is less than 20 degrees, the driving force of the screw rod increases sharply, causing the lifting table to move. Could not rise immediately.

Contents of the invention

The invention provides a lifting table driving mode in which the screw rod pushes the auxiliary lifting block when the angle between the scissor arm and the horizontal plane is small, and when the angle between the scissor arm and the horizontal plane increases to a certain degree, the screw rod then pulls the scissor arm .

In order to achieve the above object, the present invention adopts the following technical solutions:

A screw driven lifting platform with auxiliary lifting blocks, the lifting platform includes a lower frame, an upper frame, two outer support arms and two inner support arms, the middle parts of the outer support arms and inner support arms are respectively hinged Form a scissor-like structure and connect them together by setting a crossing long axis. The outer support arm and the inner support arm are respectively arranged on the inner walls of the left and right ends of the lower frame and the upper frame, and the lower rails are respectively arranged on both sides of the lower frame. , the left end of the lower frame is provided with a driver assembly, the two sides of the driver assembly are respectively provided with a drive screw group, and the screw group is driven to rotate synchronously by setting a chain, and the lifting platform also includes two lifting plates , two push rods and a U-shaped frame, the front sides of the two lifting plates are respectively provided with curved surfaces or slopes, and the curved surfaces or slopes are offset against the long axis of the intersection, and the two lifting plates A connecting beam is arranged between them, and the two lifting plates are fixed together, and lifting plate wheels are respectively arranged at the bottom of the two lifting plates, and the lifting plate wheels are in contact with the upper surface of the lower track; the two push rods are fixed The connection is arranged at the rear end of the connecting beam, and the push rods are respectively provided with nuts, and the driving screw rods of the two driving screw rod groups respectively pass through the nuts and are connected with the drive rods of the push rods. There are connecting plates connected; the middle connecting plate of the U-shaped frame is provided with two shaft holes, and the push rod at the front end of the connecting plate is installed in the shaft holes and can slide relative to the U-shaped frame. The bottom of the U-shaped frame is provided with lower rollers, which are in contact with the upper surface of the lower track, and the two sides of the U-shaped frame are respectively provided with hinge points to be hinged with the lower ends of the two inner support arms.

As a further improvement, the upper plane and the lower plane of the two lifting plates are respectively provided with a lower connecting plate and an upper connecting plate through bolts, and the lower connecting plate, the upper connecting plate and the connecting beam make the two lifting plates into Auxiliary lifting block assembly.

As a further improvement, the curved surface of the lifting plate is formed by an arc surface, a straight line tangent, or an arc surface and an arc surface, and the curvature center of the arc surface is located on one side of the lifting wheel.

As a further improvement, the left side walls of the lower frame are respectively hinged with the lower ends of the outer support arms by setting lower hinge shafts, the upper ends of the outer support arms are respectively provided with upper roller shafts, and on the upper roller shafts As for the upper roller, upper rails are arranged on both sides of the upper frame respectively, and the upper roller is in contact with the lower surface of the upper rail.

As a further improvement, the sum of the acute angles formed between the tangent of the highest point of the curved surface on the lifting plate and the horizontal plane and the lines between the centers of the three hinge centers on the outer support arm and the horizontal plane is less than or equal to 90 degrees .

As a further improvement, upper hinge shafts are respectively provided on both sides of the left end of the upper frame, and are hinged to the two inner support arms through the upper hinge shafts.

As a further improvement, lifting wheels are respectively arranged at both ends of the crossing major axis, and the positioning sleeves are arranged to position axially and close to the inner sides of the two inner support arms respectively. The outer surface of the lifting wheel and the lifting plate The curved surfaces are in contact.

As a further improvement, the two inner front and lower ends of the U-shaped frame are respectively provided with U-shaped frame wheels, and the two sides of the U-shaped frame are respectively provided with rear axle holes, and the lower roller shafts are arranged on the rear axle holes. The lower roller is arranged on the roller shaft, and the U-shaped frame wheel and the lower roller are respectively in contact with the upper surface of the lower track.

As a further improvement, the lifting platform also includes a nut connecting plate, one end of the two push rods is connected to the connecting beam by setting a bolt, and the other ends of the two push rods are respectively connected to the nut connecting plate by setting nuts. , forming a "u" shaped push rod assembly.

The present invention provides an auxiliary lifting block driven by a screw rod when the angle between the scissor arm and the horizontal plane is small, and when the angle between the scissor arm and the horizontal plane increases to a certain degree, the screw rod then pulls the scissor arm to drive the lifting platform. Way. This method not only retains the self-locking, safe and reliable characteristics of the driving screw of the traditional lifting table, but also greatly reduces the driving force of the screw when the angle between the scissor arm and the horizontal plane is small, which not only reduces the driving power, but also reduces the The initial height of the lifting platform is increased, and the lifting range is increased, which makes it very convenient for goods to go up and down the lifting platform.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the present invention with the upper frame panel removed.

Fig. 2 is a schematic structural diagram of the present invention with the upper frame panel removed.

Fig. 3 is a schematic structural view of the auxiliary lifting block assembly of the present invention.

Fig. 4 is a schematic structural view of the "u"-shaped push rod assembly of the present invention.

Fig. 5 is a schematic structural diagram of the U-shaped frame of the present invention.

Fig. 6 is a top view of the lifting platform of the present invention when it is in the lowest position.

Fig. 7 is a side sectional view of the present invention at the lowest position.

Detailed ways

The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figure 1 and Figure 2, a screw driven lifting platform with auxiliary lifting blocks, the lifting platform includes an upper frame 1, a lower frame 4, two outer support arms 5, two inner support arms 6, two Block lifting plate 23, two push rods 13, U-shaped frame 14 and nut connecting plate 16, the middle part of described outer support arm 5 and inner support arm 6 form the scissors structure by hinge respectively, and by setting cross long axis 9 are connected together, the outer support arm 5 and the inner support arm 6 are respectively arranged on the inner walls of the left and right ends of the lower frame 4 and the upper frame 1, and the lower rails 27 are respectively arranged on both sides of the lower frame 4, and the lower The left side walls of the frame 4 are respectively hinged with the lower end of the outer support arm 5 by setting the lower hinge shaft 25. The upper end of the outer support arm 5 is respectively provided with an upper roller shaft 18, and an upper roller is arranged on the upper roller shaft 18. 19. The two sides of the upper frame 1 are respectively equipped with upper rails 26, the upper rollers 19 are in contact with the lower surface of the upper rail 26, and the upper hinge shafts 17 are respectively arranged on both sides of the left end of the upper frame 1, and pass through The upper hinge shaft 17 is hinged with the two inner support arms 6 .

As shown in Figures 6 and 7, the left end of the lower frame 4 is provided with a driver assembly 3, and the two sides of the driver assembly 3 are respectively provided with a drive screw group 2, and the screw group 2 is driven by a chain. Rotate synchronously, the front sides of the two lifting plates 23 are respectively provided with curved surfaces, the two ends of the cross major axis 9 are respectively provided with lifting wheels 7, and the positioning sleeves 8 are arranged to axially position and abut against the two sides respectively. The position of the inside of the inner support arm 6, the outer surface of the lifting wheel 7 is in contact with the curved surface of the lifting plate 23, and a connecting beam 12 is arranged between the two lifting plates 23 to fix the two lifting plates 23 together. Lifting plate wheels 24 are respectively arranged at the bottom of the two lifting plates 23, and the lifting plate wheels 24 are in contact with the upper surface of the lower rail 27; the two push rods 13 are fixedly connected and arranged on the rear end of the connecting beam 12 , the push rods 13 are respectively provided with nuts 15, the drive screw rods of the two drive screw rod groups 2 respectively pass through the nuts 15 and are connected to the drive rods 13, and the two push rods 13 are provided with a connection The plates 16 are connected; the middle connecting plate of the U-shaped frame 14 is provided with two shaft holes, and the push rod 13 at the front end of the connecting plate 16 is set in the shaft holes, and can slide relative to the U-shaped frame 14. The stroke is equal to the stroke of the cross major axis 9 on the lower track 27 through the curved surface or the inclined plane lifting plate 23. The bottom of the U-shaped frame 14 is provided with a lower roller 21, and the lower roller 21 is connected to the upper surface of the lower track 27. In contact with each other, hinge points are respectively provided on the two sides of the U-shaped frame 14 to be hinged to the lower ends of the two inner support arms 6 .

As shown in Figure 3, the upper plane and the lower plane of the two lifting plates 23 are respectively provided with the lower connecting plate 10 and the upper connecting plate 11 by bolts, and the described lower connecting plate 10, the upper connecting plate 11 and the connecting beam 12. The two lifting plates 23 are made into a stable frame; the curved surface of the lifting plate 23 is formed by the arc surface and the arc surface tangent, and the curvature center of the arc surface is located at the center of the lifting wheel 7 One side; the sum of the acute angles between the tangent of the highest point of the curved surface on the lifting plate 23 and the horizontal plane and the lines of the three hinge centers on the outer support arm 5 and the horizontal plane is equal to 90 degrees.

As shown in Figure 5, the two inner front lower ends of the U-shaped frame 14 are respectively provided with U-shaped frame wheels 22, and the rear axle holes are respectively arranged on both sides of the described U-shaped frame 14, and the lower roller shafts are arranged on the rear axle holes. 20. The lower roller shaft 20 is provided with the lower roller 21, and the U-shaped frame wheel 22 and the lower roller 21 are respectively in contact with the upper surface of the lower track 27.

As shown in Figure 4, one end of the two push rods 13 is connected to the connecting beam 12 by setting bolts, and the other ends of the two push rods 13 are respectively connected by bolts to the nut connecting plate 16 by setting nuts 15 to form "u" shaped push rod assembly.

The initial position of this elevating platform is shown in Figure 7, and at this moment nut connecting plate 16 and U-shaped frame 14 have certain initial distance, when driver assembly 3 work, drive two screw mandrels to rotate synchronously by chain drive, two screw mandrels drive The push rod assembly moves horizontally to the left, and the push rod assembly pushes the auxiliary lifting block assembly to move horizontally to the left synchronously. The movement of the lifting plate 23 drives the lifting wheel 7 in contact with it to move along the curved surface, thereby driving the two support arms to rise. At this time, the horizontal movement of the lower end of the inner support arm 6 also drives the U-shaped frame 14 that is hinged therewith. Movement to the left. When the lifting wheel 7 moved to the uppermost end of the curved surface, the nut connecting plate 16 and the U-shaped frame 14 just contacted, and at this moment, the thrust of the nut 15 directly acted on the lower end of the inner support arm 6 through the U-shaped frame 14, and the further movement of the nut Prompt the lifting wheel 7 to disengage from the lifting plate 23, and pull the lower end of the inner support arm 6 to make the lifting platform continue to rise to the highest position as shown in Figure 1. The descending process is the opposite of the above.

Claims (9)

1. the elevator driven by guide screw of the auxiliary block that hoists of band, this bay-lift comprises underframe (4), upper frame (1), two outer support arms (5) and two inner support arms (6), described outer support arm (5) and inner support arm (6) middle part are respectively by hinged formation scissor structure, and connect by arranging intersection major axis (9), described outer support arm (5) and inner support arm (6) are separately positioned on two ends, the left and right inwall of underframe (4) and upper frame (1), the both sides of described underframe (4) arrange lower railway (27) respectively, the left end of described underframe (4) arranges drive machine unit (3), the both sides of described drive machine unit (3) arrange respectively and drive screw mandrel group (2), and by arranging chain drive screw mandrel group (2) synchronous axial system, it is characterized in that: this bay-lift also comprises two pieces and plays lift slab (23), two push rods (13) and U-shaped frame (14), described two leading flanks playing lift slab (23) arrange curvilinear plane or inclined-plane respectively, described curvilinear plane or inclined-plane offset with the described major axis (9) that intersects, between two lift slabs (23), tie-beam (12) is set, two are played lift slab (23) fixing together, two are played lift slab (23) bottom and arrange the web wheel (24) that hoists respectively, the described web wheel that hoists (24) contacts with lower railway (27) upper surface, two described push rods (13) are fixedly connected with the rear end being arranged on tie-beam (12), push rod (13) is respectively arranged with nut (15), the drive lead screw of two described driving screw mandrel groups (2) is each passed through nut and described push rod (13) is in transmission connection, and is provided with connecting panel (16) and is connected between two push rods (13), the middle part connecting panel of described U-shaped frame (14) is provided with two axis holes, be located in axis hole at the push rod (13) of connecting panel (16) front end, and can relatively slide by U-shaped frame (14), the bottom of described U-shaped frame (14) is provided with bottom roller (21), bottom roller (21) contacts with lower railway (27) upper surface, and the lower end being respectively arranged with hinge-point and described two inner support arms (6) in two sides of U-shaped frame (14) is hinged.

2. a kind of elevator driven by guide screw with the auxiliary block that hoists according to claim 1, it is characterized in that: upper plane and the lower plane of described two lift slabs (23) arrange lower connecting plate (10) and upper junction plate (11) respectively by bolt, described lower connecting plate (10), upper junction plate (11) and tie-beam (12) play lift slabs (23) by two becomes service hoisting block assembly.

3. a kind of elevator driven by guide screw with the auxiliary block that hoists according to claim 1, it is characterized in that: the described curvilinear plane playing lift slab (23) is tangent or arc surface and arc surface is tangent forms by arc surface, planarea, and the center of curvature of arc surface is positioned at the side of wheel (7) that hoist.

4. a kind of elevator driven by guide screw with the auxiliary block that hoists according to claim 1, it is characterized in that: hinged with the lower end of outer support arm (5) respectively by arranging lower jointed shaft (25) on the left end two side of described underframe (4), the upper end of described outer support arm (5) arranges upper roller shaft (18) respectively, and upper roller (19) is set on upper roller shaft (18), the dual-side of described upper frame (1) is arranged get on the right track (26) respectively, and described upper roller (19) contacts with (26) lower surface that gets on the right track.

5. a kind of elevator driven by guide screw with the auxiliary block that hoists according to claim 4, is characterized in that: the described tangent line playing the vertex of the curved surface on lift slab (23) and horizontal surface hold the line at acute angle and upper three the hinged centers of outer support arm (5) and horizontal surface and hold acute angle sum and be less than or equal to 90 degree.

6. a kind of elevator driven by guide screw with the auxiliary block that hoists according to claim 1, it is characterized in that: the left end both sides of described upper frame (1) arrange jointed shaft (17) respectively, and be hinged by upper jointed shaft (17) and two inner support arms (6).

7. a kind of elevator driven by guide screw with the auxiliary block that hoists according to claim 1, it is characterized in that: described intersection major axis (9) two ends arrange the wheel (7) that hoists respectively, and by arranging locating bush (8) axial location and the position near two inner support arm (6) inner sides respectively, described wheel (7) outside face that hoists contacts with the curvilinear plane playing lift slab (23).

8. a kind of elevator driven by guide screw with the auxiliary block that hoists according to claim 1, it is characterized in that: described U-shaped frame (14) two in front lower end arrange respectively U-shaped frame wheel (22), described U-shaped frame (14) both sides arrange rear axis hole respectively, and bottom roller axle (20) is set on rear axis hole, described bottom roller axle (20) arranges described bottom roller (21), and described U-shaped frame wheel (22) and bottom roller (21) contact with described lower railway (27) upper surface respectively.

9. a kind of elevator driven by guide screw with the auxiliary block that hoists according to claim 1, it is characterized in that: this bay-lift also comprises nut connecting plate (16), one end of two push rods (13) is connected with tie-beam (12) by arranging bolt, described nut connecting plate (16) bolt connects respectively by arranging nut (15) by the other end of two described push rods (13), forms " u " shape push-rod assembly.