CN2034411U

CN2034411U - Ball type screw lift device

Info

Publication number: CN2034411U
Application number: CN 88206755
Authority: CN
Inventors: 许华荣
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-06-04
Filing date: 1988-06-04
Publication date: 1989-03-22

Abstract

The utility model relates to a rolling ball-type screw rod lift mechanism which is composed of five parts of an arc-shaped screw rod, a light sleeve, an adjusting screw, a rolling ball and an adjusting hole. Braking stripes on the screw rod can prevent the screw rod from disengaging from the light sleeve. The light sleeve is not provided with threads, and the matching work of the adjusting screw and the rolling ball can replace the functions of the threads. When the screw rod rises and falls in the light sleeve, the rolling ball can correspondingly rolls freely on the threads of the screw rod. The screw distance of the screw rod is increased about two times compared with the original screw distance when the utility model is used, so the lifting speed is raised about two times correspondingly. The utility model has the advantages of easy processing, high precision, installation time saving, stable raising and falling, fast speed, long service life, screw rod looseness prevention, etc.

Description

Ball type screw lift device

What the utility model was related is a kind of screw lifting mechanism, especially about the improvement of steel pipe swivel chair lifting mechanism.

Before the utility model is made, general screw lifting mechanism is made up of screw rod and nut two parts, this lifting mechanism has certain shortcoming, and for example nut is to form behind the inside machining internal thread of light (steel) cover, and this has just consumed certain man-hour.In addition, because of there not being positioning control on the screw rod, in use do not pay attention to, it is excessive to rise, and screw rod breaks away from nut, causes unnecessary trouble.Also have screw rod, nut to use wearing and tearing gradually after a period of time, cause gap increase, the lifting shakiness, serious even scrap, screw pitch generally has only 6mm simultaneously, rise or the speed of falling slow.

In view of the above problems, the purpose of this utility model is, provides a kind ofly without nut, and lifting steadily and speed is big, the ball-type screw lifting mechanism that can not deviate from again.

Ball-type screw lifting mechanism described in the utility model is made up of with accent hole five parts arc screw rod, no screw thread light cover, governing screw, liquid pearl.

The ball-type screw lifting mechanism is compared with existing screw lifting mechanism, has following advantage:

(1) screw tip has the braking line, can avoid screw rod to deviate from, and causes contingency; The original increase 80～120% of pitch ratio, thus rising or falling speed corresponding add fast again about.

(2) light puts no screw thread, has both reduced processing capacity, shortens by ETL estimated time of loading again.

(3) the die is cast after manufacturing for the tolerance on fit between original nut, the screw rod, only meeting is increasing to use the back, can't regulate, adopt the utility model, because light cover handling ease, just fewer with the tolerance on fit of screw rod, only 10～15 of diameter clearances significantly reduce than original 100.Though use the back also can wear and tear, the available adjustment screw is regulated at any time, but therefore at longer a period of time lifting held stationary always, thereby screw rod prolonged greatly, the service life of light cover.

Fig. 1 is the constructional drawing of the ball-type screw lifting mechanism of semi-sictional view.

Fig. 2 is the part sectional view of governing screw.

Fig. 3 is the right elevation of Fig. 2.

For the ease of understanding the utility model.Embodiment with reference to the accompanying drawings is elaborated:

Fig. 1 has described the structure of ball-type screw lifting mechanism, and it is made up of with adjustment hole (8) light cover (3), governing screw (4) and the ball (5) of arc screw rod (1), no negative thread.

Form of thread on the screw rod (1) is arc (6).Arc (6), governing screw Internal Spherical Surface (9) and ball (5) engagement, free to rotate between them.Braking line (10) is arranged on the screw rod, because ball does not match with braking line (10), ball moves to this moment, and or else screw rod can rotate, thereby has prevented that screw rod breaks away from the light cover, causes contingency.The pitch of screw rod is 10～14mm, than original increase be twice about, so rising or falling speed is corresponding double about.

Light has put one to three female adjustment hole (8), and its corresponding have 1 to 3 ball of 1 to 3 governing screw.360 ° of radians (1), 180 ° (2), 120 ° (3) setting is left and rightly pressed in the position of adjustment hole (8); Upper and lower and screw thread adapts.What Fig. 1 described is two adjustment holes, one of them hole governing screw (4) of having packed into.Governing screw Internal Spherical Surface (9) contacts closely with the liquid pearl, and governing screw has cooperated the effect of nut inner thread in original lifting mechanism with ball (5).When the screw rod lifting, ball is done correspondingly freely to roll on screw flight.Light puts no screw thread, so handling ease, precision improves, and (diameter clearance: 10～15 of the utility model, it is steady that 100 of original technology go up lifting, thereby prolonged service life.(7) be to sit the clamp nut that the end links to each other with swivel chair.(2) be bottom dead point " lug ".

Claims

1, a kind of ball-type screw lifting mechanism, of the present utility model being characterised in that: this lifting mechanism is made up of arc screw rod (1), threadless light cover (3), governing screw (4) and ball (5) and adjustment hole (8) five parts.The arc (6) of governing screw Internal Spherical Surface (9), arc screw rod and ball (5) engagement, free to rotate between them.

2, by the described ball-type screw lifting mechanism of claim 1, it is characterized in that light puts the adjustment hole (8) of 1 to 3 negative thread, its corresponding have 1 to 3 governing screw, 1 to 3 ball.The position of adjustment hole: about press 360 ° of radians (1), 180 ° (2), 120 ° (3) setting; Upper and lower and screw thread adapts.

3, by claim 1 or 2 described ball-type screw lifting mechanisms, it is characterized in that it is 10～14mm that screw rod one end has braking line (10), pitch.