Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
  • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
  • B23Q11/0078—Safety devices protecting the operator, e.g. against accident or noise
  • B23Q11/0092—Safety devices protecting the operator, e.g. against accident or noise actuating braking or stopping means

Definitions

• the invention relates to a machine system, in particular for the production of tool or machine parts, with a machine shaft for driving a tool head or workpiece carrier, which is associated with a trained as a passive brake system safety brake system (8).
• the safety brake system comprises a brake disk surrounding the machine shaft, which can be brought into frictional contact with a number of friction linings arranged on associated pressure bolts as required, compressed air or hydraulic fluid being provided as the pressurized medium, and wherein each pressure bolt is provided with a brake booster.
• Print camera is assigned.
• the invention is based on the consideration that to avoid damage to the machine shaft in emergency braking by the friction linings should not be frictionally connected to the machine shaft.
• the frictional connection of the friction linings should therefore be done with a material which is adaptively mounted on the machine shaft and can be removed in case of damage during emergency braking in the simplest way again. Therefore, the brake system should include a brake disc surrounding the machine shaft. This brake disc should then be brought into frictional contact with an emergency braking with a number of arranged on associated pressure piston friction linings.
• the braking system is designed as a passive brake system. This means that the brake system remains in the open or dissolved state only under the influence of force, whereby the machine shaft can be put into operation. Should this force influence, which keeps the brake system in the open state, be eliminated by a machine failure or deliberately by a Notabscibilshebel, the brake closes automatically and arranged on the pressure piston friction linings come into frictional contact with the brake disc. This has a braking of the machine shaft result by the now tightened brake system.
• each pressure pin is assigned a brake booster pressure chamber. About this pressure chamber, the pressure pin associated friction linings can be actively pressed against the brake disc. This is done by filling the brake booster pressure chamber via additional connections mounted on the surface of the brake system.
• compressed air As a pressurized medium for power transmission compressed air is used. This provides in the simplest way, the required safety in emergency braking, which can be achieved quickly and precisely, for example by ventilation of the brake system.
• a hydraulic fluid is used as the pressure-carrying medium.
• By using a hydraulic fluid instead of compressed air it is possible to generate higher pressures and thus an increased braking force.
• the same pressure medium is used for both pressure chambers.
• a spring assigned to the pressure pin is prestressed. This could in principle be a tension spring for pulling the friction lining in the direction of the brake disk, but also a compression spring which is then arranged on the side opposite the friction lining side of the pressure bolt.
• a free-pressure chamber is arranged in an advantageous embodiment Reibbelag mineral on each of a number of pressure bolts.
• This pressure chamber can be filled with a pressurized medium via a number of connections arranged on the surface of the pressure system. As a result, the spring for the operation of the machine shaft is further biased.
• each one arranged on an associated pressure piston friction lining comprehensive braking elements are arranged symmetrically about the central axis of the machine shaft. This uniform and circular distribution of the brake elements allows minimization of the occurring moments and thus provides further protection for the machine shaft to be braked.
• the advantages achieved by the invention are in particular that the actual machine shaft is not damaged in an emergency braking by the use of a brake disc as a rigidly connected to the machine shaft element and the other part of the brake system. Replacement of the brake system due to wear is therefore possible without removing the machine shaft and in a simple and cost-effective manner. Furthermore, the braking force can be selectively and actively amplified from the outside in the event of braking via an external terminal and arranged on the pressure pin brake booster pressure chamber. As a result, different requirements profiles to a brake system can be taken into account.
• FIG. 1 shows a section through a machine with a shaft and with mounted clamping or braking system
• Fig. 2 is a schematic representation of a clamping or braking element
• Fig. 3 is a plan view of a clamping or braking system.
• the machine installation 1 comprises a machine housing 2 with a machine shaft 6 rotatably mounted in a bearing 4.
• This machine shaft 6 is used for machining materials, in particular metals for producing machine tools. or tool parts, equipped at one end with a tool head or workpiece carrier (not shown).
• the machine shaft 6 is equipped with an annular clamping or braking system 8. This clamping or braking system 8 is attached to the machine shaft 6 and secured by a number of screw on this.
• brake elements 10 For safe and rapid braking of the machine shaft 6 are located in the clamping or braking system 8 more circularly arranged brake elements 10. Such an arrangement minimizes the occurring during braking of a rapidly rotating disk moments.
• These brake elements 10 each have a provided with a friction lining 14 thrust washer 16, which is pressed by means of a pressure pin 18 in the case of braking to the brake disc 12 and frictionally contact it.
• This brake disc 12 is connected via a screw 20 rigidly connected to the machine shaft 6.
• a pressure piston 17 associated freestanding pressure chamber 32 This can be filled with compressed air or hydraulic fluid and solve the friction pad 14 associated pressure pin 18 of the brake disc 12 by the pressure generated thereby.
• the brake system 8 according to FIG. 1 further comprises two ports 26a, 26b which are intended to be filled on the one hand of the release pressure chamber 32 and on the other hand to fill the brake booster pressure chamber 34.
• the brake disc 12 Due to the specific design of the brake disc 12 as a part of the interchangeable clamping or braking system 8 and the other as via the screw 20 rigidly connected to the machine shaft 6 element, the machine shaft 6 is not damaged in an emergency braking by wear and friction. Possible damage occurs only on the brake disc 12 and in the friction linings 14, which, however, can be easily, quickly and inexpensively replaced.
• a clamping or braking element 10 is shown enlarged again in FIG. It can be seen that only the brake disc 12 is rigidly connected via a screw 20 to the machine shaft 6.
• This brake disk 12 can be braked by two friction linings 14, which are positioned on both sides of the brake disk 12, which results in a braking of the machine shaft 6.
• the necessary pressure, which is required for braking the machine shaft 6, is established by a compression spring 22.
• this pressure spring 22 pushes a pressure pin 18 arranged on a pressure piston 17 along a guide plate 24 in the direction of the brake disk 12.
• each pressure piston 17 or pressure pin 18 may be assigned its own free-pressure chamber 32 or a plurality of pressure piston 17 is associated with a common freestanding pressure chamber 32.
• the brake element 10 is opened and abandoned the braking effect. This is done via a via a port 26a into the freestanding pressure chamber 32 passed pressure medium.
• Particularly suitable compressed media are compressed air and hydraulic fluids.
• the pressure medium from the free-pressure chamber 32 is passed and the pressure piston 17 is accelerated by the force of the tensioned compression spring 22 in the direction of the brake disk 12. Due to frictional forces between the friction linings 14 and the brake disk 12, the machine shaft 6 is braked.
• the material pairings of the friction linings 14 and the brake disk 12 can be adapted to the requirements of hard or soft braking.
• This passive brake system has the advantage that in case of a machine failure or a malfunction of the brake system 8, this automatically closes and thus the machine shaft 6 comes to a standstill in an emergency braking.
• the brake element 10 has a second external connection 26b, via which a brake booster pressure chamber can be filled with a pressurized medium.
• the braking force can be amplified in the simplest manner depending on the pressure medium used.
• Fig. 3 is a plan view of a clamping or braking system 8 is shown.
• This clamping or braking system 8 is pushed through the opening located in the middle of the machine shaft (not shown) and fixed by the located in an inner ring 28 locking holes 30, the brake disc 12 on the machine shaft.
• the brake disc 12 extends inside the clamping or braking system 8.
• Also inside are circular distributed around the central axis of the individual brake elements 10.
• these 16 brake elements 10 which are symmetrical about the Center axis are distributed.
• In the edge region of the clamping or braking system 8 are further terminals 26a, 26b for opening the clamp or the brake and connections for strengthening the clamping or braking force and mounting holes 36 for attachment of the brake system 8 on the machine housing. 2
• the brake system 8 according to FIG. 3 is designed in the form of a solid disk. However, it is also possible and depending on the application even advantageous to use only a single circle segment. In addition, it is possible to use such a brake system 8, then floating, to use on both sides of the brake disc 12. This ensures that no forces act on the machine housing and the machine shaft. LIST OF REFERENCE NUMBERS

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• 2007
  • 2007-09-14 DE DE102007044053A patent/DE102007044053A1/de not_active Withdrawn
• 2008
  • 2008-09-10 JP JP2010524391A patent/JP5323077B2/ja not_active Expired - Fee Related
  • 2008-09-10 DE DE502008001969T patent/DE502008001969D1/de active Active
  • 2008-09-10 EP EP08801981A patent/EP2188088B1/de active Active
  • 2008-09-10 CN CN200880106590A patent/CN101801598A/zh active Pending
  • 2008-09-10 WO PCT/EP2008/007415 patent/WO2009036918A1/de active Application Filing
  • 2008-09-10 AT AT08801981T patent/ATE490050T1/de active

Patent Citations (6)

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