CN2876043Y

CN2876043Y - Mechanical type lifter

Info

Publication number: CN2876043Y
Application number: CN 200520029639
Authority: CN
Inventors: 王荣本; 储江伟; 金立生; 郭烈
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2005-12-30
Filing date: 2005-12-30
Publication date: 2007-03-07
Anticipated expiration: 2015-12-30

Abstract

The utility model relates to a mechanical-type lifter used for lifting the heavy object, which comprises an outer cylinder, a circulating ball lead screw that is positioned on the bottom though a supporting bearing, a circulating ball lead screw nut that is matched with the lead screw and a drive mechanism that is fixed at the lower end of the lead screw, wherein, the circulating ball lead screw nut is fixed to the bottom of the middle cylinder that is slidingly matched with the inner chamber of the outer cylinder; a leading screw cover that is provided with an axial-through key slot on the inner wall is enclosed on the circulating ball lead screw via a sliding key block, the lead screw cover is arranged on the bottom of the middle cylinder through the lead screw cover supporting bear, the outer wall of the lead screw cover is provided with thread that is matched with the lead screw cover nut; a inner cylinder that is connected with the loading platform at the upper end is positioned between the lead screw cover and middle cylinder, the inner cylinder performs sliding cooperation with the middle cylinder, the bottom of the inner cylinder is fixed to the lead screw cover nut. The device is effective to solve the technical difficulty of that realizes more lifting height with the lifter structure having relatively short primary height.

Description

The mechanical type lift jack

Technical field

The utility model relates to the lift jack that is used for the lifting weight, particularly a kind of mechanical worm drive formula lift jack.

Background technology

The common type of drive that is used for lifting weight device mainly contains single step helical leading screw, parallelogram lindage and hydrostatic drive etc.The lift height maximum of single step helical screw type lift jack also can only reach the length of leading screw; The lift height of parallelogram lindage lift jack depends on the combined number of linkage, and volume is bigger; The hydrostatic drive lift jack can adopt telescopic, but will need bigger hydraulic reservoir volume during big lift height.

Summary of the invention

The objective of the invention is in order to overcome existing lift jack when requiring the little and lift height of initial length big again, the problem that its complex structure and volume are bigger; And a kind of mechanical type lift jack of the stroke structure that doubles is proposed.

The utility model mechanical type lift jack, comprise that an outer cylinder and lower end are arranged on recirculating ball leading screw on the outer cylinder bottom and the recirculating ball feed screw nut that matches with the recirculating ball leading screw by backup bearing, be connected in the rotary drive mechanism of recirculating ball leading screw lower end, and objective table, be characterized in: described recirculating ball feed screw nut is connected in the bottom with the middle cylinder barrel of outer cylinder inner chamber sliding fit; On described recirculating ball leading screw, be nested with the screw set that an inwall is provided with axial perforation keyway by the feather key piece, in the middle of the screw set backup bearing of this screw set by the bottom is seated at the bottom of the cylinder barrel on, this screw set outer wall is provided with the screw thread that matches with the screw set nut; Also have a upper end to connect the inner cylinder tube of objective table between screw set and middle cylinder barrel, this inner cylinder tube and middle cylinder barrel are sliding fit, and its bottom is connected on the screw set nut; On the outer wall of described middle cylinder barrel and inner cylinder tube, have the guide groove of axial perforation and the anti-rotating pin tabling that is installed in respectively on outer cylinder and the middle cylinder barrel.

The utility model mechanical type lift jack, constitute transmission device by circulating ball type lead screw transmission pair, common screw transmission and feather key transmission, the lifting article carrying platform is produced under the effect of a rotary drive mechanism increase a times rectilinear path, solved the technical barrier of realizing big lift height with the lift jack structure of shorter elemental height effectively; And, can improve driving efficiency effectively owing to adopt the auxilliary mutually structure of circulating ball type lead screw transmission pair and common screw transmission; Has the failure-free self-locking performance again.

Description of drawings

Fig. 1 is the utility model lift jack structural representation;

Working state schematic representation when Fig. 2 is a Lifter Raised shown in Figure 1.

The specific embodiment

The embodiment that provides below in conjunction with accompanying drawing is described in further detail the structure of the utility model.

With reference to Fig. 1, a kind of mechanical type lift jack, comprise that an outer cylinder 6 and lower end are arranged on recirculating ball leading screw 7 on outer cylinder 6 bottoms and the recirculating ball feed screw nut 10 that matches with recirculating ball leading screw 7 by backup bearing 9, be connected in the rotary drive mechanism 8 of recirculating ball leading screw 7 lower ends, and objective table 1, described recirculating ball feed screw nut 10 is connected in the bottom with the middle cylinder barrel 5 of outer cylinder 6 inner chamber sliding fits; On described recirculating ball leading screw 7, be nested with the screw set 3 that an inwall is provided with axial perforation keyway by feather key piece 2, this screw set 3 is seated in middle cylinder barrel by the screw set backup bearing 11 of bottom at 5 the end, and these screw set 3 outer walls are provided with the screw thread that matches with screw set nut 12; Also have a upper end to connect the inner cylinder tube 4 of objective table 1 between screw set 3 and middle cylinder barrel 5, this inner cylinder tube 4 is sliding fit with middle cylinder barrel 5, and its bottom is connected on the screw set nut 12; On the outer wall of described middle cylinder barrel 5 and inner cylinder tube 4, have the guide groove of axial perforation and

anti-rotating pin

13,15 tablings that are installed in respectively on outer cylinder 6 and the middle cylinder barrel 5, rotate with cylinder barrel 5 in the middle of limiting and inner cylinder tube 4.

On described outer cylinder 6 and middle cylinder barrel 5 internal diameters, be respectively equipped with the outer wall sliding fit of necking down

guidance tape

14,16 and middle cylinder barrel 5 and inner cylinder tube 4, to reduce the friction force between the cylinder barrel wall.

Described feather key piece 2 is installed in the top of recirculating ball leading screw 7, and its outer rim is provided with screw set 3 inwalls and axially connects the key tooth that keyway matches, and rotates simultaneously with the rotation of recirculating ball leading screw 7 to realize screw set 3.

With reference to Fig. 2, the lifting principle of work of the utility model lift jack is: when recirculating ball leading screw 7 rotates under the driving of rotary drive mechanism 8, cylinder barrel 5 upwards rose in the middle of recirculating ball feed screw nut 10 drove, and screw set 3 and inner cylinder tube 4 also upwards rise with middle cylinder barrel 5; Simultaneously, because recirculating ball leading screw 7 rotates together by feather key piece 2 drive screw sets 3 screw set nut 12 is upwards risen along screw set 3 together with inner cylinder tube 4; Thus, make objective table 1 obtain increasing doubly rising stroke.

Claims

1. mechanical type lift jack, comprise the recirculating ball feed screw nut (10) that an outer cylinder (6) and lower end are arranged on the recirculating ball leading screw (7) on outer cylinder (6) bottom and match with recirculating ball leading screw (7) by backup bearing (9), be connected in the rotary drive mechanism (8) of recirculating ball leading screw (7) lower end, and objective table (1), it is characterized in that: described recirculating ball feed screw nut (10) is connected in the bottom with the middle cylinder barrel (5) of outer cylinder (6) inner chamber sliding fit; Upward be nested with the screw set (3) that an inwall is provided with axial perforation keyway at described recirculating ball leading screw (7) by feather key piece (2), this screw set (3) is seated in middle cylinder barrel (5) by the screw set backup bearing (11) of bottom at the end, and this screw set (3) outer wall is provided with the screw thread that matches with screw set nut (12); Also have a upper end to connect the inner cylinder tube (4) of objective table (1) between screw set (3) and middle cylinder barrel (5), this inner cylinder tube (4) is sliding fit with middle cylinder barrel (5), and its bottom is connected on the screw set nut (12); On the outer wall of described middle cylinder barrel (5) and inner cylinder tube (4), have the guide groove of axial perforation and anti-rotating pin (13, the 15) tabling that is installed in respectively on outer cylinder (6) and the middle cylinder barrel (5).

2. mechanical type lift jack according to claim 1 is characterized in that being respectively equipped with in described outer cylinder (6) and middle cylinder barrel (5) internal diameter upper end the outer wall sliding fit of necking down guidance tape (14,16) and middle cylinder barrel (5) and inner cylinder tube (4).

3. mechanical type lift jack according to claim 1 is characterized in that being installed at described feather key piece (2) top of recirculating ball leading screw (7), and its outer rim is provided with screw set (3) inwall and axially connects the key tooth that keyway matches.