DE202018103313U1 - Hand-operated belt sanding machine for external cylindrical grinding of pipes for different lengths of sanding belts - Google Patents

Abstract

Belt grinding machine for grinding substantially in cross-section round bodies, comprising a base body and arranged on the base deflecting or counter roller and means for receiving an abrasive belt and a drive roller for the rotation of the abrasive belt and the deflection or counter-rollers, wherein a deflection or counter-roller (3, 4) on a lever element (12) pivotally coupled to the base body (2), wherein for generating a restoring force, a torsion spring (14) is provided, characterized in that at least one of the deflection or counter rollers (3, 4) relative to the base body (2) relative to this positionable and lockable.

Description

Technical area

The invention relates to a manually operated belt sander with a sanding belt, which is guided over a motor-driven drive roller and at least one deflection roller, wherein a holder is provided, both the deflection roller and a spaced from the deflection roller counter roll and in addition a Konnektierungselement includes for receiving a drive element.

State of the art

Hand-operated belt grinding devices, in particular for external cylindrical grinding of pipes, are known from the prior art.

These devices have a base body, which comprises a receiving element for receiving an electric drive connected to a drive roller. The drive roller serves to drive a grinding belt (endless belt with a defined width and length), which is guided over a deflection roller or a counter roller. The grinding range is defined by the distance between the deflector and counter-roller.

In order to prevent the abrasive belt breaks when pressed too tight, the deflection roller is usually spring loaded so that it can travel a short distance.

Devices of this known type have a drill-like handle, which serves to guide the holding device in addition to the retention of the drive element. Protective devices serve to prevent the removal of unwanted material in different directions as a result of the grinding process.

Disadvantages of the prior art

However, the prior art has the disadvantage that a different device must be used for each tape length of abrasive belt. This leads to handling problems and high costs.

Object of the invention

Therefore, the object of the invention is to further develop the belt grinding machine known from the prior art for external cylindrical grinding of pipes in such a way that different belt lengths of abrasive belts can also be accommodated.

Advantages of the invention

One of the main advantages of the invention is that a permanent use of the belt grinding machine is ensured, since in particular technical features such as strong bend, use of a torsional torsion spring, but also the fixed side windows in the rotating rollers are crucial features that provide a safe and durable function ensure the belt grinder.

Further advantageous embodiments will become apparent from the following description and the drawings and the claims.

list of figures

• 1 eine Seitenansicht auf die Bandschleifmaschine;
• 2 eine weitere Seitenansicht auf die Bandschleifmaschine gemäss 1;
• 3 eine perspektivische Ansicht auf die Bandschleifmaschine, mit eingefahrener Gelenkrolle;
• 4 eine perspektivische Ansicht auf die erfindungsgemässe Bandschleifmaschine, mit der Gelenkrolle in einer ersten beispielhaft gewählten Position;
• 5 eine perspektivische Ansicht auf die erfindungsgemässe Bandschleifmaschine, mit der Gelenkrolle in einer zweiten beispielhaft gewählten Position;
• 6 eine perspektivische Ansicht auf ein Halteelement der Bandschleifmaschine gemäss den 1 bis 5;
• 7 eine perspektivische Ansicht auf eine Anwendung des Halteelements gemäss 6.

Show it:

• 1 a side view of the belt grinder;
• 2 a further side view of the belt grinding machine according to 1 ;
• 3 a perspective view of the belt grinder, with retracted joint roller;
• 4 a perspective view of the inventive belt grinding machine, with the joint roller in a first exemplary selected position;
• 5 a perspective view of the inventive belt grinding machine, with the hinge roller in a second exemplary selected position;
• 6 a perspective view of a holding element of the belt grinding machine according to the 1 to 5 ;
• 7 a perspective view of an application of the retaining element according to 6 ,

Description of the invention

According to the invention, the belt grinder - hereinafter the device 1 called - as in 1 and 2 shown, such that these from a
drive unit A and a main body 2 consists. The main body 2 has a c-shaped structure in plan view.

At one end of the c-shaped structure is a pulley 3 arranged, wherein from the deflection roller 3 spaced, at the other end of the c-shaped configuration a counter-roller 4 is arranged.

The main body 2 has a receiving opening 5 on which serves a drive unit A to fix, with fixative 6 (Especially as a quick release mechanism) are provided. In order to make a better reception of the drive unit, the preferably round-shaped receiving openings 5 chamfered. In addition, adapter ring elements may be provided to accommodate different types of prime movers. The drive unit itself has a drive roller 7 on. This is designed such that over the entire width of a rough material 8th is arranged (preferably tissue-like) to better adhesion to the inside of an abrasive belt 9 to ensure. The sanding belt 9 is through the drive roller 7 in the direction of the arrow L emotional.

The sanding belt 9 itself gets over the drive roller 7 , the counter role 4 and the pulley 3 led and takes the in 1 represented shape. The sanding belt 9 is closed and thus formed as a circulating belt. It is from the inside 10 through the drive roller 7 driven and runs over the deflection or the counter roll. Especially with the counter role 4 is the sanding belt 9 guided, whereas in a drive roller 7 no front guides must be provided.

A particular embodiment of the invention provides that the deflection roller 3 via a lever element 12 on the body 2 is arranged. In the main body 2 is a hole 13 provided, on which the lever element 12 is arranged articulated. In the joint itself is a torsion torsion spring 14 provided that allows the pulley 3 in and against the arrow direction P ( 1 ) is pivotable against a spring pressure to the pressure (arrow F ), on the pipe to be processed R Works, balance and to prevent the sanding belt 9 tears. This can also affect the body 2 and thus on the sanding belt 9 Pressure to be exercised.

If the pressure decreases, the lever element moves 12 back to its corresponding starting position.

Alternatively - and as in the 1 and 2 shown - is in addition to the lever element 12 a locking element 30 is provided. This has the function, the pivoting movement (arrow and dart P ) in at least one position. The reason for this is that this gives a larger force F over the sanding belt 9 on the pipe R can be applied. The latching element 30 is designed as a pin-like element that in a first position (release of the pivoting movement) and a second position (locking the pivoting movement) can be transferred. This Rastelelement 30 is operated by hand and easy to transfer from a first to a second position.

The main body 2 is designed such that a side view c-shaped space between pulley 3 and counter role 4 arises. This is the basic body 2 his bent away from the recording of the drive device end and has at its free end a bore, by means of which the counter-roller 4 is recorded. The stronger the bend is, the more it is possible to get "behind the workpiece to be machined". Therefore, in a preferred embodiment, the bend is such that when the body is oriented horizontally 2 the bore for receiving the counter-roller and the bore for receiving the lever element 12 are arranged almost on a horizontal line. The bend is designed such that it is almost perpendicular to the longitudinal extent of the body 2 he follows.

According to the invention it is provided that at least one of the deflection or counter-rollers 3 . 4 opposite the main body 2 can be positioned and locked relative to this. This leads to different lengths of sanding belts 9 can be used with one and the same device. In 3 to 5 is the device 1 with different lengths of abrasive belts 9 shown. In 3 is an abrasive belt 9 with the length 610 mm, in 4 a grinding belt with the length of 650 mm, in 5 a sanding belt 9 with the length 760 mm. In addition, other lengths, such as the use of an abrasive belt 9 with the length 780 mm of an abrasive belt 9 possible with the length 820 mm.

The positioning is via a displacement mechanism 20 implemented. This shifting mechanism 20 has one degree of freedom. This is a sliding element 22 provided, which is displaceable in or on the base body 2 is stored. The sliding element 22 comprises a rod-shaped element 21 At the free end is the counter-roll 3 arranged. By moving in the direction of the arrow M or in the opposite direction, the in 2 and 3 achieved maximum or minimum positions can be achieved.

In order to achieve a fixation of the respective position, it is provided that the displacement element 22 by a fixing element 23 held in its respective position. On the rod-shaped element 21 are holes at defined intervals 24 provided in which the fixing element 23 intervenes. There is a locking instead. These positions of the drill holes 24 correspond to the respective tape lengths of the sanding belts 9 , In addition, the respective matching holes 24 be marked with the respective lengths of the sanding belts.

The role 3 , the counter role 4 and the drive roller 7 are formed so that these different widths of abrasive belts 9 be able to record. The respective commercial widths are characterized by the fact that the abrasive belt rests on the circumference of the respective roller and laterally by elevations 16 ( 3 ).

To allow for right-handed and left-handed use, is on the main body 2 a grip element 15 provided that, in contrast to the prior art, not on one or on another side of the body 2 is arranged, but at the top. This handle element 15 , in the 5 and 6 shown, has a control panel 17 for embracing the grip element 15 and a tool 18 on, taking on the tool 18 integrated a thread 19 for screwing into the body 2 is provided. The tool 18 for example, serves the role 3 , the counter role 4 or the drive roller 7 to solve and exchange.

The main body 2 who has the appropriate shape, as in 1 is shown, occupies, can be provided both as a stamped part, as a forged part and as a pressing part.

LIST OF REFERENCE NUMBERS

1

contraption

2

body

3

idler pulley

4

counter-roller

5

receiving opening

6

fixing element

7

capstan

8th

rough material / fabric

9

sanding belt

10

inside

11

core

12

lever member

13

drilling

14

Torsionsdrehfeder

15

handle element

16

increase

17

control panel

18

Tool

19

thread

20

displacement mechanism

21

rod-shaped element

22

displacement element

23

fixing

24

drilling

A

driving element

L

arrow

P

arrow

R

pipe

M

direction

Claims (5)

Belt grinding machine for grinding substantially in cross-section round bodies, comprising a base body and arranged on the base deflecting or counter roller and means for receiving an abrasive belt and a drive roller for the rotation of the abrasive belt and the deflection or counter-rollers, wherein a deflection or counter-roller (3, 4) on a lever element (12) pivotally coupled to the base body (2), wherein for generating a restoring force, a torsion spring (14) is provided, characterized in that at least one of the deflection or counter rollers (3, 4) relative to the base body (2) relative to this positionable and lockable. Belt grinder after Claim 1 , characterized in that the deflection or counter-roller (3, 4) via a displacement mechanism (20) with a degree of freedom relative to the base body (2) is positionable and lockable Belt grinder after Claim 2 , characterized in that the displacement mechanism (20) provides a displacement element (22), which is displaceably mounted in or on the base body (2). Which in turn comprises a rod-shaped element (21), at the free end of the counter-roller (3) and by moving in the direction of arrow M or in the opposite direction at least one other position of the counter-roller (3) relative to the main body (2) can be reached. Belt grinder after Claim 3 , characterized in that the displacement element (22) by a fixing element (23) is held in its respective position, wherein on the rod-shaped element (21) at defined intervals provided holes (24) into which engage the fixing element (23). Belt grinder after Claim 4 , characterized in that the fixing element (23) is a pin which is mounted in the base body (2) and immersed in the respective bore (24).

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